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The Essential Role of Flat Roofs in Efficient Rainwater Management

The Popularity of Flat Roofs in Commercial Real Estate

Commercial real estate owners often favor flat roofs for their properties, and there are myriad reasons for this popular choice. The cost-effectiveness, versatility, and relatively simple maintenance of flat roofs make them a highly desirable option. However, one key advantage of flat roofs that is frequently underestimated is their exceptional capability to manage rainwater effectively.

The Importance of Rainwater Management

Why is rainwater management so crucial for commercial buildings? The importance lies in the potential damage that mistreated rainwater can inflict on structures. Over time, the buildup of rainwater can trigger significant structural harm. Additionally, the interior of a building also becomes susceptible to water damage or flooding. The design of flat roofs, however, can help mitigate these risks.

The Subtle Pitch of Flat Roofs

Contrary to what their name suggests, flat roofs are not entirely level. They are structured with a subtle pitch to aid water drainage. Specifically, flat roofs boast a minimum ‘fall’ or slope of 1:40. This implies that for every 40 “units” of horizontal distance, there’s a 1-unit decrease in vertical height. This carefully calculated gradient is designed to prohibit water stagnation and promote efficient runoff.

The Role of Drainage Systems

Drainage systems are an essential element of flat roofs. These systems can be categorized as either internal or external. Internal drainage systems feature drains positioned at strategic points on the roof, facilitating the flow of water into the building’s main drainage system. External systems, on the other hand, direct water off the sides of the roof. Regardless of the type of drainage system in place, an efficient one will promptly and effectively remove rainwater from the roof, thus preventing potential water damage.

Rainwater Harvesting with Flat Roofs

Flat roofs also offer the chance for rainwater harvesting, a feature that grows increasingly valuable as concerns for water conservation and sustainability heighten. The expansive surface area of flat roofs allows for optimal rainwater collection. This collected water can then be filtered and utilized for a variety of non-potable needs such as irrigating plants, flushing toilets, or cleaning cars and windows, thereby reducing the building’s overall water usage.

The Maintenance of Roofing Materials

In addition, the maintenance of the roofing material used is another vital element in rainwater management. Flat roofs commonly incorporate materials such as PVC, EPDM, and TPO due to their impressive resistance to water and durability under extreme weather conditions. Regular monitoring and maintenance of these materials can help ensure the roof’s longevity and continued efficiency in rainwater management.

Conclusion: The Significant Role of Flat Roofs

To summarize, flat roofs are instrumental in efficient rainwater management. They safeguard the building from potential water damage, facilitate the conservation of water resources, and contribute positively to the building’s overall sustainability. As we grapple with the realities of climate change and the looming threat of water scarcity, the role of flat roofs in rainwater management becomes ever more vital. This role should be a major consideration in the choice and design of commercial roofing systems.

4 Benefits of Installing a Silicone Roof Coating on Your Flat Roof

industrial flat roofing

Are you looking for a reliable and cost-effective solution to preserve your flat roof? Look no further than Energy Shield silicone roof coating – the most advanced and durable form of waterproof protection available today. Let’s take a closer look at some of the amazing benefits of applying a silicone roof coating:

1. Silicone Roof Coatings Have Unrivaled Waterproofing Properties

The unique blend of polymers and resins in Energy Shield’s coating system create an impermeable barrier that provides superior waterproof protection against even the heaviest rainfall. Its ability to resist ponding water also makes it ideal for roofs with poor slopes or convexity. Additionally, its flexibility allows it to move with the roof as it expands and contracts due to weather conditions – ensuring an effective seal is maintained throughout.

2. Highly Reflective UVA Protection

Silicone roof coatings have highly reflective properties that make them excellent at reflecting sunlight and heat, which can help reduce cooling costs during summer months. Their superior UVA protection also helps protect your roof from UV damage, reducing wear and tear over time.

3. Tough & Durable Design

Energy Shield’s innovative coatings are designed to withstand all kinds of weather conditions – from scorching hot summers to frigid sub-zero temperatures – without compromising on performance or effectiveness. The robust elasticity also ensures that your coating won’t crack or split due to extreme temperature fluctuations – making it suitable for use in any climate!

4. Long-Lasting Performance

Silicone coatings can provide superior performance for up to 20 years with minimal maintenance required over its lifetime! Plus, they are extremely resilient against mold, mildew, pollutants, dirt, and other elements – guaranteeing you get extended life out of your coating system.

Additional Benefits of Silicone Roof Coatings

In addition to being environmentally friendly and energy efficient, Energy Shield silicone coatings are fire resistant – helping give you additional peace of mind in case disaster strikes! It is also incredibly easy to apply since it requires no specialized tools or equipment; anyone familiar with DIY projects will be able install this quickly!

A silicone roof coating is one of the best options available when looking for a durable, long-lasting form of waterproof protection for your flat roofs! With superior UVA protection and energy efficiency benefits, Energy Shield’s amazing range of silicone coating systems are sure to enhance every aspect of your rooftop experience while providing unmatched longevity – contact us today to learn more about our products and how we can help extend the life span of your flat roofs!

Quick Fixes for Spray Foam Roof Systems

example of spray foam insulation on wall

Quick Fixes for Spray Foam Roof Systems

Maintaining a roof system is one of the most important ways to extend the lifespan of your property and keep it safe from weather elements. Spray foam roofs are an increasingly popular option for building owners. They offer versatile durability and efficient energy use, but like all structures, they benefit from regular inspections and maintenance. To help you keep up with care for your spray foam roof, here are some easy-to-implement quick fixes. These can ensure its proper functioning for years to come!

Inspect the roof regularly for any cracks, punctures, or damage

Maintaining a quality roof requires regular inspections. Inspections every season, every year, and after any major weather events. Find trusted professionals who can take a look and help you identify any existing damage. Or identify areas that may be susceptible to future problems. Need to determine if there’s any rot, punctures, open seams, cracks, or evidence of leaks (water staining) in tiles or shingles. Small damaged areas can cause big problems. Getting out regularly and identifying these issues early can lead to greater peace of mind and potential long-term savings on repairs.

Check for any gaps or open seams that need to be sealed

When it comes to sealing gaps and open seams, it’s important to check that all areas are sufficiently sealed. This is especially relevant in regions with severe weather conditions. As open seams can make your home susceptible to heat loss. Additionally, looking for any openings that need to be sealed can help keep out pests like rodents and insects. Taking a few minutes to check for any openings around the house can help maintain a comfortable temperature. It can also provide peace of mind when it comes to pest control.

Clean your spray foam roof system of debris, dirt, and leaves

Keeping your spray foam roof system free of debris, dirt, and leaves is essential for its longevity. Removing any buildup of materials can help to make sure that your roof system maintains its optimal condition and performance. Regularly cleaning your spray foam roof system will prevent damage from water or dirt build-up. It will also protect it from mold growth and deterioration. Taking a few minutes every few months or so to clean up the surface of your roof can ensure that you get the full use out of it for years to come.

Reapply sealant to exposed areas that may be damaged or worn down

Keeping your building or structure properly sealed is an important part of protecting it against water, humidity, and other outside elements. The sealant applied to your windows, doors, and other exposed areas is there to provide a barrier that is both effective and durable. However, over time these sealants can be worn down or damaged by external factors like heat, cold, and age. To ensure the security of your property, it’s essential that you reapply the sealant whenever you notice any damage or wear. So that further damage does not occur and your home remains protected. Regular reapplication of sealant will save you money and time in the long run. Reapplication helps protect against water damage, insulation issues, and more.

Replace any broken or missing parts of the roof system

Keeping a roof in good working condition is important for protecting a building’s occupants and contents from the elements. As such, it is important to be proactive and replace any broken or missing parts of the roof system as soon as possible. This may involve inspecting all components of the roof . Inspecting the fascia, rafters, soffits, and gutter systems to shingles, tiles or slates. And replacing parts that are no longer functioning correctly. With proper maintenance and repair, you can ensure your roof remains reliable for years to come.

Monitor the temperature of your foam roof system – warm temperatures can cause it to expand and contract quickly, causing further damage

Maintaining your foam roof system by monitoring temperatures is of the utmost importance. Especially in warm weather. Where fast expansion and contraction due to extreme temperatures can cause serious damage. The best way to ensure that your foam roof remains in top condition is to keep an eye on the temperature readings. Making any necessary adjustments to avoid drastic changes. Regular inspections, either done yourself or by a roofing technician, can prevent a minor issue from becoming a major one. When it comes to foam roof systems, temperature control is key!

Preserving your roof system by getting into the habit of performing regular maintenance is key. Striving for a few minutes each month can have a huge impact on saving you time, money, and stress caused by potential damages in the future. It may seem tedious to inspect, clean, seal, and replace parts. But this will add years to the life of your foam roof system and save you from unexpected downtime and repairs. Don’t let yourself be caught off guard by an unexpected roof repair bill. Make sure to keep up-to-date on regularly scheduled inspections and maintenance!

The Importance of Commercial Roof Maintenance

metal flat commercial roof
commercial roof maintenance guy repairs roof

Proactive Maintenance of Your Commercial Roof Matters. Here’s Why and How 


Your roof is one of your most important assets. It protects your people, your property, your profits — reliably, silently, day after month after year. That’s why commercial roof maintenance is one of the smartest investments you can make in your business. When you’re good to your roof, it will be good to you.  


Achieving the long-term performance you need comes down to a single word: maintenance. Regular inspections, prompt identification of issues, and immediate completion of repairs are central to preventive maintenance. This mitigates damage and extends the life of your roof.  


What to Think About When Thinking about Maintenance  


Knowing what’s happening with your roof is central to keeping your facility in top-notch shape. Here are several things to keep in mind.   

Develop an ongoing relationship with a professional roofing contractor.

Often that’s the company that installed your roof. They’re already familiar with you, your property, and your business. So they’re in the best position to know when something is wrong. Another good idea is working with an outfit from your area. This way they will be familiar with everything from local weather to governmental regulations. And should you need to find a different partner, be sure to thoroughly check credentials and experience. Commercial roofing is not a job for amateurs. So you want to work with knowledgeable pros.   

Establish a schedule of periodic roof inspections and stick to it.

For commercial properties, the National Roofing Contractors Association recommends twice a year. Spring and fall make sense to find damage that may have occurred during harsh winter blizzards and volatile summer storms. In case of extraordinary events like a tornado, nearby fire, break-in and vandalism, or any unexpected occurrence, contact your inspector immediately to take a look. Having your facility manager spot-check your roof in between major inspections makes sense as well.  

when to scheduke your commercial roof maintence appointment

Know what kind of roofing system is atop your building.

Many inspection and commercial roof maintenance activities apply to every structure. But you might have different systems with variations in requirements and weaknesses. For example, spray polyurethane foam (SPF) is susceptible to UV deterioration. While the gravel layer topping built-up roofing (BUR) can be loosened by severe wind and rain. Things like seams that pull apart, gaps between flashings and HVAC vents, and seals around drains and cornices can differ by roofing system. Eventually all may weaken and fail over time. By creating ponding on flat surfaces, drains blocked by leaves, dirt, waste, trash, or other debris are a problem for every roof. Make sure your contractor is knowledgeable about your specific system and its peculiarities. You should be too.  

Keep a log of all roof-related actions

Keep a log of all roof-related actions. Include written records, photos, videos, and CAD drawings of every inspection and repair. This is particularly important as your roof ages so you can keep track of what’s happened over time. Such knowledge helps you know which repairs are done over a roof’s lifespan and when replacement might make sense. Should you need to file an insurance claim or warranty adjustment, you’ll be asked to provide such information in detail. Plus, many policies and warranties require proof of periodic inspection to remain in force.  


Understanding the Inspection Process  


Setting up a contract with your roofing partner is the best way to make sure inspections happen semi-annually and on time. Some contractors offer multiple inspection and maintenance options at various price points. You can choose what’s best for you.  

 The Process

The contractor needs to follow an established process to ensure your inspection is thorough and careful. Using an inspection checklist is essential. You’ll want to review it ahead of time so you know what to expect. If you’re not familiar with inspection checklists, look online for samples. Many formats are available. You’ll want to make sure yours includes information (size, age, system, location) about your roof, details about roofing components (HVAC, stacks, drains, gutters), and a list of inspection items to be analyzed and described.  

 The Review

The actual review starts inside your building, as the inspector looks for evidence of leaks and water damage. Walking the rooftop follows, starting at the perimeter and working toward the middle. Now the inspector is looking for ponding, holes, cracks, gaps, blisters, uplifted seams, protruding nails, broken seals, loose flashings, lifted edges, litter, algae, and anything else outside the norm. The inspector may take a few core samples (which are repaired) of the roofing material. This helps determine the number of layers, type and age of the system, moisture saturation, and other relevant facts. Expect the comprehensive inspection of a flat, 20,000-square-foot roof to take about an hour.  

commercial roof maintenance on flat roof

A report follows, generally within a few days. This document describes findings, along with photos and videos. It details the roof’s overall condition, specific deficiencies discovered during the inspection. It also includes any repair recommendations and a quote for proposed work.  


In addition to the time-tested physical inspection process, new technologies provide even more detail about roof condition. These include drones that fly around your building’s exterior to record close-up footage of surface regions and infrared inspection. It uses thermal imagery to find signs of weakness or damage not visible to the naked eye. Your inspector will analyze data provided by these techniques and incorporate outcomes into their report.  


Investing Now Avoids Expense Later  


The cost of a commercial roof maintenance inspection varies. It depends on factors like roof size, type, age, accessibility, slope, number of penetrations, climate, building location, and more. Price is often calculated by size; between $0.05 and $0.10 per square foot is the norm. With the disclaimer that costs are volatile at this time (February 2023) and could well be more. Typically, the price for inspecting a 10,000-square-foot roof ranges between $500 and $1,000. Some contractors provide inspections free of charge, often as a prelude to doing whatever repair work is indicated as a result. Negotiating a long-term agreement for ongoing maintenance usually includes setting the inspection price upfront, which is efficient and hassle-free.  


Despite the temptation to stretch out inspection intervals or forego the process altogether, procrastination will cost you in the long run. So does putting off indicated fixes. Because left unattended, small issues can quickly grow into big, pricey repairs. The solution: proactive inspection and ongoing maintenance, for peace of mind that all is well.   

Commercial Roof Leaks & Causes

commercial roof leak
Engineers inspecting a commerical roof leak

Your Commercial Roof Is Leaking. Now What? 


Drip, drip, drip. As a building owner or property manager, that is not a sound you ever want to hear. But when drip, drip, drip happens, ignoring it has consequences that accelerate over time. And just in case you’re thinking about ignoring the problem, consider this: 70% of commercial property damage comes from water intrusion. In other words, commercial roof leaks matter, a lot.  


How Leaks Happen  


Sometimes leaks are obvious, like when a tornado, hurricane, blizzard, or other devasting event punches an actual hole through the roof into your structure. Weather is a top cause of commercial roof leaks, and when catastrophic damage happens, it must be addressed immediately.  


But there are plenty of less turbulent forces that cause leakage as they constantly impact your roof.  

 Bad Drainage

Bad drainage means that rather than channeling water off the roof’s surface, scuppers, gutters, and downspouts are blocked, clogged, and not working properly. As a result, water is pooling and staying on the roof rather than draining away from the building. Eventually such pooling deteriorates the roof’s structure as water seeps through cracks, crevices, and weak spots to find a path to lower ground. Ponding water also puts weight on your roof. A mere one-inch-deep pool of water weighs more than 5 pounds per square foot of surface area; multiply that over a 25-foot-wide puddle to understand how quickly the stress on your building adds up. Ice dams cause similar problems, as do snow melt and refreeze.  

Material Damage

Material damage to the membrane that covers your roof, the base substrate under the membrane, and/or the flashings that seal the perimeter are common causes of leaks. Over time, the membrane can crack, split, or shrink, compromising its integrity. Heavy foot traffic, debris, UV rays, and pollution are often at fault. Breaks in the membrane expose the substrate, allowing damage to spread. Flashings are thin strips of metal or similar material that protect the membrane’s edges and seal the joints between different parts of the roof. Over time, flashings expand and contract with temperature changes and are loosened by storms, inhibiting their capacity to prevent water seepage into the building’s interior.  

Deteriorating Seals

Deteriorating seals around penetrations for HVAC units, conduits, drains, hot stacks, skylights, vents, and other protrusions let water penetrate the membrane and spread inside the building. Each hole must be sealed properly and tightly around the penetration, with closures monitored and maintained over time.  


Aging is a fact of roofing life. Commercial flat roofs typically last 15 to 20 years; after that, even with proper maintenance, they deteriorate beyond repair and need to be replaced.  

Improper Installation

Improper installation or system mismatch can compromise a roof from the outset. Commercial roofs are complex structures that require installation by qualified, knowledgeable contractors to function properly. Different types of systems are available, with SPF (spray polyurethane foam), BUR (built-up roofing), and single-ply membranes (EPDM, TPO, and PVC) most common for commercial purposes. But which type of roof is appropriate for what application is a complicated decision that impacts every aspect of your facility.  

spotting a commercial roof leak

Why Leaks Matter  


Anytime water is visible within your building, your roof is leaking somewhere. Understanding that is important for a number of reasons, starting with customer and employee health and safety concerns. Water is a hazard but often difficult to see, especially in small puddles on the floor. A wrong step can cause a slip-and-fall incident, with potential injury and lawsuits as a result. Growth of mold and mildew in damp spaces is another risk, especially for those with respiratory illnesses or immunity concerns. Water stains on walls and ceilings are not only unpleasant to look at; if severely damaged, building materials like drywall and ceiling tiles can actually rot and fall.   


The same is true for the wood framing, joists, trusses, and rafters that make up the framework of your building. Wood absorbs moisture, causing it to expand and contract, affecting structural integrity to the eventual point of collapse. Electrical wiring is equally vulnerable. Over time, water exposure causes moisture-proof coatings to become brittle and crack, exposing the wiring beneath. Outlets, fixtures, panels, and switchboxes can short out, spark, and trigger a fire, which is a disaster no one wants.  


Higher energy bills are yet another indicator that your roof is no longer fully intact. Water-saturated insulation caused by leakage can lead to a 40% loss in R-value; before long, this expense shows up in inflated costs as you try to keep your building property heated and cooled.  

building inspectors identify roof damage

What To Do  


Sooner or later, most commercial roofs leak. Handling the issue quickly and efficiently is key to containing damage and keeping repair costs under control. Several steps make up your action plan.  

 Don’t panic but take the leak seriously

Commercial roof leaks inevitably get worse, so dealing with them as soon as possible means the roof should be repairable. But be prepared and have emergency funds available so you can act fast. 

Clear the affected area of people, supplies, and equipment

That confines damage to the smallest possible space and protects valuable resources. Collect water in a bucket and mop frequently to keep the floor dry. If you have large, heavy objects that can’t be moved, cover them with plastic to prevent damage.   

Pinpoint and mark the source of the leak

Try to do this while it’s still raining or snowing so you know where water is coming in. Once the area dries, finding the intrusion is tough. When conditions are safe, get onto the roof to check for ponding; also make sure drains, downspouts, and gutters are clear and working properly. While you’re at it, look for other problems, just in case.  

Contact your roofing contractor partner

Contact your roofing contractor partner to assess the damage and determine the repair. Then get the roof fixed promptly and professionally before damage spreads.    

Talk to your insurance agent

Talk to your insurance agent and review your warranty. Depending on the cause of the leak, coverage may be available to offset repair costs.  


Weather is a top cause of commercial roof leaks, and when catastrophic damage happens, it must be addressed immediately. To stay ahead of water problems, you want to set up a twice-yearly inspection and maintenance program with your roofing partner. Working with your contractor to maintain the integrity of your roofing system is the best possible strategy for protecting your facility and the people and property inside

Pros and Cons of Commercial Roofing Systems

commercial roofing pros and cons male worker picking up piece of roof
commercial roofing pros and cons male worker picking up piece of roof

A Comparison of Commercial Roofing Systems—Process, Longevity, Pros and Cons 


Lots of options. Lots of variables to sort through. Lots of advantages and disadvantages. Lots of decisions are to be made.  


When it comes to figuring out what type of roofing system is best for your commercial property, you’ve got plenty of things to work out. Attaining your best results involves having a detailed understanding of your people and business. Also knowing your physical location and type of facility. As well as analyzing the roofing systems available to you. This includes upfront costs and long-term warranties. When it comes to actually doing the job, the use of top-quality materials and installation by qualified professionals is a must. So is performing both routine maintenance and taking care of immediate emergency repairs over the long haul.  


To help with all that, check the chart for an overview of six common commercial roofing choices. We’ve also included a brief description of the processes and estimated longevity. There is also a listing of pros and cons associated with each one.  

Pros and Cons of Commercial Roofing Systems 


Built-up Systems  

BUR ‒ Built-up roofing 

Commonly called tar-and-gravel, roofs are built of multiple, alternating layers of bitumen (asphalt) and reinforcing fabrics. They’re topped with a protective layer of gravel or stone. In use 100+ years, BUR offers well-proved effectiveness.  
  • Strong protection from UV rays increases energy efficiency of property  
  • Number of layers is adjustable to each situation. More layers = better protection  
  • Low maintenance is required over roof lifespan  
  • Good fire resistance built in 
  • Excellent for very large commercial properties. BUR is more affordable than newer, synthetic systems  
  • Installation is hot, messy, slow, labor-intensive, with hazardous materials, fumes, disruption of business activity 
  • Heavy materials add weight to building  
  • System can be susceptible to wind/water damage  
  • Leaks, tears are difficult to find, repair  
  • System is better suited to warmer than cold climates 

15-30 yrs. 



Built-up Systems (continued)  

Mod bit – Modified bitumen roofing  

Similar to BUR, mod bit has fewer layers, more adhesive options. Plys (layers) are sealed down to the roof deck or coverboard with no seams. Three different surfaces are available, mineral, foil, or laminate, with ceramic coating.  
  • System is strong, waterproof, airtight, tear-resistant  
  • Minimal maintenance is needed 
  • Mod bit is more affordable than newer, synthetic systems  
  • On-site installation is labor-intensive 
  • Dark color of materials absorbs heat, decreases energy efficiency 
  • Vulnerable to UV damage 
  • Supplemental coating is needed to improve energy efficiency 

10-20 yrs. 




Single-ply Membrane Systems 

EPDM ‒ Ethylene propylene diene monomer 

AKA rubber roofing. EPDM is a thermoset process using a membrane manufactured offsite with all ingredients incorporated into rolls of material. Chemically cross-linked polymers become rigid once applied. One layer of membrane is applied to the roofing substrate. Seams are sealed between membranes with mechanical fasteners.  
  • Rolls of membrane come in varying thicknesses to match material specifications to each property, situation  
  • Installation is easy since membranes are ready to place when delivered  
  • The system is not easily damaged by UV rays, is lightweight, durable, fire- and weather-resistant 
  • The membrane is resistant to leaks, punctures 
  • Seams between membranes can fail. Allowing moisture leakage into building 
  • Finished membrane is black. Looks like unfurled inner tube. Is not particularly aesthetically attractive 
  • While available, lighter colors are considerably more expensive  

15-25 yrs. 




Single-ply Membrane Systems (continued)  

TPO – Thermoplastic roofing  

Also a rubber-like membrane system, thermoplastic roofing is made of synthetic substances that soften when heated, harden when cooled, and can be reshaped over time. Seams are heat-welded, melted together for a dependable bond.  
  • Reflective white membrane repels sunlight, reflects heat, UV damage 
  • System resists corrosion, breakdown  
  • Seams are heat-welded/melted together for dependable bond  
  • Surface is resistant to mold, hail, fire, impact, air pollution. Providing long-term durability  
  • Laminating of top layer, narrow width of rolls produce weak points that can shrink, crack, deteriorate, leak  
  • Fire-resistance is low, requiring integration of proper retardants  
  • Uneven quality of materials, variations in thickness lead to consistency problems  

7-20 yrs. 



PVC ‒ Polyvinyl chloride  

This is another type of thermoplastic system. Two layers of PVC material are reinforced with polyester plasticizers. Placed between plys to provide UV stability, flexibility, and prevent curling. Heat-welding keeps seams securely adhered together.  
  • Roofing is durable, flexible, energy efficient  
  • System is resistant to moisture, fire, pollution, wind 
  • PVC is well suited to fluctuating climates, varying natural settings  
  • Materials are recyclable, eco-friendly  
  • Upfront cost is higher than some other systems 
  • Membrane tends to shrink over time, pulling apart at seams, corners, causing leaks 
  • Older roofs may shatter, puncture, be difficult to repair 

15-30 yrs. 




Spray Foam Systems  

SPF ‒ Spray polyurethane foam  

A specialized system, SPF blends two chemical elements together under heat and pressure. Forming a plastic that transforms from liquid to solid within seconds. Expanding 30 times in volume as it dries. Once hardened, a fully adhered roof surface results. The foam must be covered with an elastomeric coating of silicone, acrylic, urethane, or butyl rubber. Finished with a layer of crushed stone granules to prevent damage from UV radiation and other elements. Each roof is custom-created on-site and endlessly renewable with careful maintenance and regular elastomeric recoating. 
  • Highest R-value of any roofing for energy efficiency that saves on both heating and cooling costs  
  • Expansion properties of foam make it self-forming around protrusions (no vulnerable flashings, fasteners, tape). Formable to channel water and prevent ponding 
  • Gaps, nooks, crannies, overlaps are sealed to make roof water- and airtight 
  • System is lightweight, with good tensile strength 
  • Depth of foam can be increased for greater energy savings, weather-resistance 
  • Installation creates few business disruptions, can be installed over most existing systems 
  • Installation must take place in temperatures above 50 degrees, with low humidity, calm wind, in order for foam to form correctly  
  • Technicians must be properly trained, use highly specialized equipment for desired chemical reaction to occur  
  • Initial cost is higher than some other systems 
  • Elastomeric coating must be reapplied every 10 to 15 years to maintain integrity of system 
  • Semi-annual inspections, immediate repairs are recommended to correct issues from debris, foot traffic, weather, UV radiation  

25-40+ yrs. 


Male builder doing thermal insulation on roof of wooden frame house. Man worker spraying polyurethane foam on rooftop pros and cons of commercial roofing

It should be noted that costs vary widely and are subject to volatility. At this writing (December 2022) per-square-foot pricing ranges from $2.00 at the low end to $10.50 or more at the top. Always work with a knowledgeable, qualified professional to get the roofing system that works best for you.  

Spray Foam Cost vs. Benefit

spray foam cost vs. benefit: guy on roof using SPF
spray foam cost vs. benefit: guy on roof using SPF

ROI for SPF Is Impressive, Especially Long-Term  


As in 30 years—even indefinitely according to some commercial roofing experts. Although attaining such over-the-decades longevity does require care upfront at installation and consistent ongoing maintenance every year, the numbers confirm potential SPF value. Let’s take a look, with an important caveat. Costs within the roofing sector are extremely volatile and, like pretty much everything else as of this writing (November 2022), subject to inflation. Any numbers cited here should be regarded strictly as examples. Actual estimates for any project, including yours, must be provided by a roofing professional with deep knowledge of the industry, expertise in applicable requirements in your area, and specific understanding of your property and job. Here is spray foam cost vs. benefit explained. 


SPF Basics Explained  


Let’s look quickly at what SPF is all about. SPF is spray polyurethane foam, which is a type of sprayed-on roofing material. The spray foam is a mix of two chemical substances, a polyol resin and an isocyanate. The two elements are stored at the job site in separate tanks and pumped through high-pressure hoses with heat applied. Materials are mixed in a spray gun and sprayed in a thin coat on the surface of the roof. The thin coat of SPF expands in volume as it dries, increasing about 30 times within a matter of seconds. Cured to 1” thickness, SPF yields an approximate R-value of 6.5. R-value measures the capacity of an insulating material to resist heat flow in or out of the building, so the higher the R-value, the greater the insulating power. Many states and municipalities have a minimum R-value requirement for commercial properties, meaning to achieve an R-value of 30, which is the Department of Energy recommendation, you’ll need 4.6 inches of SPF on your roof.  

Once installed, the foam must be covered with an elastomeric coating to protect from UV radiation. Bare SPF is extremely UV-susceptible and begins to deteriorate within days, making the elastomeric coating, usually acrylic, silicone, or urethanes, essential to SPF longevity. Granules are added during elastomeric application to further reflect UV rays and also create traction on the roof.  

Ongoing maintenance is a fact of successful SPF roofing. While the two-part SPF layer itself is durable for decades, the elastomeric coating does wear thin over time, with replacement necessary every 10 to 15 years. Semi-annual inspections monitor the coating’s condition, as well as finding any other compromises caused by weather, wildlife, or activity on the roof. Fixes should be made immediately while problems are minor and easy to repair. 

Multiple Factors Affect SPF Cost  


Arriving at an estimate for your SPF system involves looking at a number of considerations that directly impact cost when comparing spray foam cost vs. benefit. Among them: 

  • Size of the roof. Knowing how many square feet need to be covered is fundamental. Economies of scale do kick in somewhere around the 20,000 square-foot range: Because overhead costs apply to every project, the bigger the roof, the lower the cost per square foot.  
  • Roof height and access. A roof that’s low and easy to get to costs less than one that’s steeply sloped, high off the ground, or can’t be walked on. Some roofs require the use of cranes, lifts, hoists, or rappelling equipment, all of which are extra costs.  
  • Condition of existing roof. SPF can be sprayed over one layer of most existing materials, although there are exceptions. In such cases, a coverboard must be installed to the roof deck before SPF is applied. Prep work includes inspection of the roof and repair of damage, removal of debris and loose material like ballast or gravel, replacement of wet insulation, and cleaning of dirty surfaces.  
  • Number of penetrations. The liquid nature of SPF makes installation around openings for vents, pipes, HVAC equipment, skylights, and other protrusions much easier than with other systems—the foam shapes itself around penetrations as it dries. Still, penetrations are a time factor, and time equals cost.  
  • Desired foam thickness. The more SPF you need to get to the desired R-value, the greater the cost. Certain types of buildings with greater than normal heating and cooling requirements (think IT companies or chemical plants) need elevated R-values, which factors into roofing costs. Secure Identification Display Area (SIDA) authorization is another possible extra; when a job involves a secure location, background checks and fingerprinting must be completed before workers are allowed on site.  
  • Elastomeric coating and length of warranty. The amount of UV-protective coating is another variable, and it’s directly related to project warranty. For a 10-year warranty, 20 mils of coating are installed, 25 mils are typical for a 15-year warranty, 30 mils for 20 years. The thicker your coating, the greater the expense.   

Many other factors can be involved in a specific situation; your professional roofing partner will help you sort those out and determine how they relate to cost. He or she can also help you evaluate alternatives to SPF roofing. A number of other systems are available, each with advantages and drawbacks that may be relevant to your situation, including cost.  

Spray Foam Roofing Technician spraying foam insulation using Plural Component Gun for polyurethane foam

Build a Chart to Look at Spray Foam Cost vs. Benefit 


Probably the best way to figure out spray foam cost vs. benefit is to put together a matrix listing items associated with costing and where your job ranks relative to each. Then be as specific as possible as you fill in the blanks and work with your contractor to equate each element to actual dollars and cents.  




Cost factor 


Low impact on



Average impact on price  



High impact on



Size of roof (sq. ft.) 


Roof height 


Roof access  


Roof repairs needed  


Cleaning, debris removal needed   


Coverboard needed 


Roof penetrations  


Desired foam thickness 


Desired coating thickness  


Warranty length, type  


Cost estimate  



As of November 2022, roofing experts indicate the price for a spray foam roof averages between $8.00 and $12.00 per square foot. If you already have SPF in place, you can also use the chart to estimate recoating costs since most of the same factors apply. Recoating presently runs in the $1.50 to $3.00 per square foot range. But given the many influences at play, costs associated with all aspects of SPF could easily go higher. That may be a good reason to carefully analyze your needs and move ahead as soon as you can.  


Bottom Line: SPF May Pay for Itself in 5 Years 


Calculating true return-on-investment for any commercial system is a long-term proposition. And while the initial expense for SPF can be somewhat higher than other choices, when it comes to lifetime cost, it pays off.  

With a rating of 6.5 per inch of thickness, SPF has the highest R-value of any roof system, keeping more heat and cooling inside your building rather than letting those commodities leak through the roof. That lightens the load on your HVAC units, bringing down your overall energy costs. In some cases, SPF savings are equal to the expense of installation in only five years—your spray foam roof has paid for itself! 

And that’s just the beginning of the cost benefits. With proper maintenance and recoating of your basic foam layers every 10 or so years, your roof is renewable, both in terms of performance and an extension of your warranty. While claims that SPF can last forever are probably exaggerated, with proper recoating (never skip that!) your roof should easily last 30 to even 50 years. Contrast that with the lifespans of other common commercial systems, which after 15 to 20 years must be replaced completely, which is always a sizeable expense.  

Add the seamless, waterproof, self-flashing, environmentally friendly, easy maintenance characteristics of the system—ROI for SPF is truly significant long-term!   

Extending the Life of a Spray Foam Roof

Spray foam roofing maintenance guy holding foam gun applicator
Spray foam roofing maintenance guy holding foam gun applicator

Spray Foam Roofing is Infinitely Renewable—Think 50 Years! Here’s How  

When it comes to extending the life of your spray foam roofing, one word says it all—maintenance.  

Spray foam roofing systems bring many exceptional properties to commercial buildings—durability, dependability, energy efficiency, thermal resistance, and waterproofing among them. With smart management, spray foam roofs can last indefinitely. A 30-year life span is common and some remain in service for as long as 50 years. But achieving that kind of longevity requires work on your part, because set-it-and-forget-it performance is the one thing you cannot expect a foam roof to do.   

The formula for keeping your spray polyurethane foam (SPF) roof in peak operating condition can be summarized in three easy-to-remember words—inspect, recoat, repair. Let’s look at each of these so you know what to do and why doing it is so important.  

Inspections Let Your Know What’s Happening Overhead 

Regularly planned and scheduled inspections are at the center of your spray foam roofing maintenance program. Establishing an ongoing relationship with a qualified contractor is a good idea. That way you’re working with someone who has intimate knowledge of your roofing system. Such familiarity allows them quickly spot changes when something is amiss. 

Plan on getting your roof inspected twice annually. Ideal timing is in late fall to prepare for the upcoming winter and in mid-spring to identify any damage that may have occurred. You also want to bring in your partner after any severe weather event (heavy rain storm, large hail, high wind, tornado, blizzard) to make sure everything is okay. Speaking of blizzards, think through your removal plan in advance so you’re ready to clear off snow weight and melt quickly. Just be sure to keep tools with sharp edges away from your roof.   

As part of your regular inspections, remove dirt, debris, leaves, moss, tree branches, weeds, wildlife, and any other foreign objects that may have landed atop your building. If trees overhang the structure, get them trimmed back to prevent limbs from scrapping the foam or breaking and falling down. Make sure water is draining properly by checking gutters, scuppers, and downspouts and making sure they’re clear.  

Your inspection plan should also include checking around penetrations for HVAC, chimneys, pipes, vents, curbs, skylights, supports, and other equipment installed on the roof. Although foam conforms around such irregularities upon installation, you want to make sure the seals are sound and all cracks and crevasses remain closed.   

Keeping records with dates of all inspections, findings, and outcomes is important to tracking the condition of your roof. Photos are a good idea. Conditions change as your roof ages, with deterioration inevitable over time. Regular inspections let you know when and what to do.  

spray polyurethane foam for roof - technician spraying foam insulation using plural component gun for polyurethane foam, inside

Recoating Rebuilds Protection from UV Rays   

One of the most important steps in every inspection is measuring the condition of the elastomeric coating covering the foam. Since UV light is the biggest single enemy of spray foam roofing systems, the foam must be protected from the sun. That’s exactly what the elastomeric coating is all about. The coating allows the roof to provide the energy efficiency, insulation, and waterproofing that make SPF such an ideal commercial choice. Without it, the foam takes on water and damage to your building results.  

A roof is protected from the sun’s harmful UV rays when the elastomeric coating is at least 15 dry mills thick. But the sun’s UV intensity is relentless, and over time, the coating thins. Once that layer reaches 10 mils, the time to recoat has come. Generally, that’s about a decade after the original SPF installation. Your roofing partner can gauge condition and provide sound advice.  

Recoating should only be done by a qualified contractor. The first step in the process is making a thorough inspection of the roof to make sure there are no leaks or areas of wet foam. Any such issues must be addressed before recoating takes place. Of great importance is using the same coating material (usually silicone, acrylic, urethane, or butyl rubber) as initially applied. Depending on climate, location, and other ambient conditions, two layers may be needed to deliver optimum protection. Your original coating may have been reflective to increase R-rating and UV shielding; if so, your recoating should be the same.  

The real beauty of SPF systems is that once a new coating has been applied, the roof’s warranty can be extended. A typical warranty is 20 years, which means recoating yields many more years of worry-free protection. That’s major return on investment, which is what SPF roofing is all about.   


Repairs Are Easy When Handled Quickly 

With many powerful forces constantly impacting your roof, holes, blisters, cracks, punctures, and other intrusions are bound to occur. That’s an important purpose of your regular inspections—finding such things promptly while they’re still easy to fix. Trust your contractor to do it properly; don’t try to make repairs yourself.   

After cleaning the affected area, your partner removes the defective coating and foam with a knife or similar tool. Then, using a compatible caulking material, they fill the resulting holes. To complete the repair, an area of acrylic or silicone top coating is applied. That’s all there is to it and the best reason for moving fast: Damage doesn’t fix itself; it grows.  


Take Care of Your Roof and It Will Take Care of You  

Some experts say that SPF roofs last basically forever. While that may be something of an exaggeration. It is true that with routine care and proper maintenance there are no real threats that cause foam to deteriorate. And no known limits to how many times you can recoat a roof. As long as you’re diligent about protecting your foam from the sun, the life span of your foam roof is indefinite. Extending the life of your SPF system is as simple as paying attention and taking action at appropriate times.  

Spray Foam Roofing Basics

Spray Foam Roofing Technician spraying foam insulation using Plural Component Gun for polyurethane foam
Spray Foam Roofing Technician spraying foam insulation using Plural Component Gun for polyurethane foam

What To Consider When Using a Spray Foam Roof  

As one of the most versatile plastic materials, polyurethanes are everywhere. Polyurethanes can solve all sorts of challenges. Like how to put a roof on your commercial building that’s durable, flexible, lightweight, renewable, waterproof, and easy to install and maintain.  Here are some spray foam roofing basics that’ll help you make the right solution.

The solution you’re looking for is spray foam roofing. When it comes to energy efficiency and long-term performance, spray foam roofing is tough to beat.  


Spray Foam Roofing Explained  

Spray polyurethane foam (SPF) is a plural-component chemical product created by blending two materials, isocyanate and polyol resin. These two elements react when mixed together under heat and pressure. This significantly expands the liquid volume. When used for roofing purposes, once the substance hardens, a solid, fully adhered roofing membrane results. Commercial structures are a great candidate for SPF roofing. It efficiently covers large surfaces and does not add significant weight.  

There are several layers to your spray foam roof.


An existing roof or decking forms the base. This underlying layer or substrate supports the foam system. Any number of materials can make up this layer. Including whatever built-up roofing, modified bitumen, EPDM, PVC, TPO, metal, or concrete is already in place. (Some may require the installation of a cover board prior to the application of foam.) Clean the base thoroughly to remove dirt, dust, debris, and other contaminants. This is to ensure maximum adhesion.   


The next step is applying the substrate with polyurethane foam spray. It is necessary to use a specialized spray foam rig. A separate container houses each chemical that makes up SPF onsite. Then pumped through high-pressure hoses to a mixing gun at a temperature between 115-130° F. After application, the SPF liquid expands and solidifies into a dense foam membrane. It is typically 1 to 1.5 inches thick, as it cures. The polyol component determines the thickness of the foam. Needing a density of 2.7-3.0 lbs. The foam is rigid enough to walk on without causing damage. This is important for commercial purposes.


An elastomeric coating of silicone, acrylic, urethane, or butyl rubber protects the foam from UV exposure and other elements. It may need two layers. This depends on climate, location, warranty, and other requirements. The top layer is often reflective to increase energy efficiency and shield against UV rays.  


Finally, #11-grade roofing granules are broadcast into the elastomeric top coat. These bits of crushed stone add strength, durability, UV protection, and resistance to wildlife to the foam membrane that covers up the roof.  

Understanding that installation of SPF roofing system is not a job for amateurs is essential. One must have significant knowledge of SPF chemistry. The equipment requires an expert. Technicians must be properly trained on all aspects of SPF technology. They have a proficiency that can take years to acquire. To make sure you’re working with a certified SPF contractor, ask to see job references, industry certifications, case studies, product samples. If possible, arrange an in-person roof walk of a recently completed project. Any qualified contractor is proud to show off the company’s work. 

Spray Foam Roofing Polyurea Spraying, warming foam coating of roof, focus on wall

The Pros of SPF   

For facility managers and property owners alike, the benefits of SPF are impressive.  

That starts with thermal resistance: Spray foam has the highest R-value of any conventional roofing material. R-value measures a material’s capacity to resist heat flow. Keeping your building cool is easier with SPF’s R-value of 6.6 per inch of thickness. These insulation properties translate into lower energy bills, which is especially important given the relentless escalation of costs. The longevity of SPF roofing—a properly installed and maintained system will last a minimum of 20 years and often 30 or more—delivers significant savings over the long haul.

In Comparison 

The installation of SPF is faster and less disruptive than that of other commercial systems. . Among the reasons: No tear-off of existing roofing saves time and mess. There’s less odor than with other types of installations, especially built-up tar and gravel. The self-contained nature of SPF means fewer materials need to be hauled to the rooftop, and the risk of objects blowing or falling from the roof is reduced. Being able to spray around penetrations for HVAC, pipes, curbs, and skylights is a real advantage. Within 30 seconds of contact, foam conforms around such irregularities and grows to close cracks and seal crevasses. Contrast that with other systems and the hours consumed by manually fitting flashings, installing fasteners, and taping gaps.  

And since SPF roofs are seamless, waterproofing is enhanced. Foam is sprayed in one continuous layer, without nooks, crannies, and overlaps for water to seep through. The closed-cell nature of the foam (ask your contractor to explain the chemistry) resists standing water and absorption as well. Should damage occur, generally it can be repaired with roofing-grade mastic or sealant.  


Understanding SPF Downsides  

 Of course, nothing is perfect, including SPF. 

For best results and maximum longevity, care and attention to the membrane are required. Twice-yearly inspections by a qualified roofing contractor trained to spot issues from debris, weather, wildlife, foot traffic, ultraviolet radiation, and other impacts are recommended. Every decade or so the elastomeric coating must be reapplied to protect the foam below.   

Potential health hazards from fumes during installation and curing are of concern, and these can linger if a building if not properly ventilated. For workers doing installation or maintenance, wearing protective equipment is a must. Overspray during application is another concern; structures, property, vehicles, and people near your building must be moved or protected from droplets that stray from the roof onto objects below.  

Understanding the limited application window is essential. SPF will not stick when moisture, frost, or ice are present, and the foam fails to form correctly if temperatures are too low. The system must be installed on days above 50° F, in relatively low humidity and calm wind. Depending on geographic location and season of the year, SPF application may have to wait for favorable conditions, so careful planning and a degree of flexibility are required.  


The SPF Bottom Line  

Although SPF has a reputation for being somewhat more expensive than other roofing systems, working with a qualified professional is the only way to get an accurate reading on actual price. Your contractor partner can help you analyze the many factors involved in your decision—the size of your building(s), age, purpose, location, climate, people, equipment, surroundings, and how best to protect the structure and what’s happening inside. Given the ease of installation, durability and insulating qualities of materials, and long-term energy efficiency, spray foam may be your ideal commercial roofing choice.  

Types of Commercial Roofing

Types of Commercial Roofing - Beige Commercial roof

Commercial Low-Slope Roofing Basics – What You Need to Know 

Commercial roofs are complicated. That’s because every instillation is essentially a custom application designed for a specific situation. Each solution must accommodate a complex combination of factors – the size of your building(s), age, purpose, location, climate, people, equipment, surroundings – which are constantly interacting to protect the structure and what’s happening inside.  Find out which types of commercial roofing are right for you.

 Since you’ll be living with your roofing decisions for a long time (15 to 40 or more years), you want to understand the options available to you, including what and how each type of commercial system works. Since the majority of commercial roofs are of the low-slope variety, this discussion focuses on those types of systems. And please don’t call them flat because they’re not. To work properly, a commercial roof must be slightly sloped. Typically, that means having a minimum pitch of one-fourth inch vertical to twelve-inch horizontal (¼:12 or 2 percent), but that can vary depending on the setting and roofing material. Roofs are considered low-slope up to 3:12 pitch.  

Figuring out your ideal slope and the myriad other details associated with commercial roofing is why your best advice is to work with a qualified, experienced professional. He or she understands everything about roofing and can apply expertise developed through years of experience, industry training, and local knowledge to your situation.  

What’s Under Your Roof Matters  

It’s easy to think of your roof as what you can see. The reality is, multiple layers are involved in making your roof work.  

  • Structural decking is the bottom layer, forming the backbone of the entire system. Steel is the most common roof deck in U.S. commercial buildings, although this foundation must be carefully matched to each structure in order to give adequate support to all the materials and activities on top.  
  • A vapor control layer helps prevent water condensation from forming and reaching interior walls, ceilings, and attics, where it can cause structural elements to grow mold, rot, and collapse. Usually made of plastic or asphalt, a vapor barrier is especially important in northern climates where exterior temperatures are colder than those inside.  
  • Thermal insulation is a layer of material installed under the roof’s surface to create a barrier between inside and outside forces. It’s important to managing heating and cooling costs.  
  • Coverboard, while not always required, can improve the quality and extend the life of a roof. Made of gypsum or high-density polyiso foam, this thin, dense substrate goes directly below the surface, adding puncture resistance and protecting from hail, foot traffic, tools, and other intrusions that can damage the roof.  
  • The roofing membrane is the outer, top layer of a low-slope roof, sealing, waterproofing, and protecting the entire roofing assembly.  
Types of Commercial Roofing Material Comparisons - Standing-Seam Metal Roof

What’s Happening on the Surface Impacts Roofing Design  

 What goes on atop the membrane is an essential part of planning the correct roofing solution for you. 

  • Size and weight. The fact that commercial buildings are often large structures with huge roof surfaces is an important part of the design equation. Relatively lightweight roofing materials are essential in order for the building to support the weight.  
  • Water. Getting water, snow, hail, and anything else liquid off the roof quickly can be a challenge because low-slope systems may not easily drain. Standing water can cause leakage and also add dangerous weight, making an efficient drainage system essential.  
  • Foot traffic. Commercial roofs generally house HVAC equipment, solar panels, ventilation fans, skylights, cooling towers, and more on the surface. These add weight and require penetrations of the roof. Service and repair technicians will need to access these items from time to time, creating foot traffic and increasing the likelihood of punctures to the membrane. Making the surface durable enough to resist such damage adds much-needed longevity and functionality.   
  • Weather, UV rays, seasonal changes, wildlife. Weather, especially storms and sunlight, is one of the main things that can degrade a roof. Birds and other wildlife also cause damage. Every commercial roof must be designed to withstand the climate; reflective outer surfaces are particularly important to controlling the interior environment.  

With all that going on, it’s easy to see why commercial roofing is such as challenge to design and maintain.  


Three Types of Low-Slope Systems Are Commonly in Use  

Single-ply roofing, built-up roofing, and modified bitumen roofing are the systems most commonly used in commercial, low-slope installations. Each has advantages and disadvantages, so you want to thoroughly investigate which application is appropriate for your situation. Your professional roofing consultant is a great asset in that regard.  

  • Single-ply roofing is a type of membrane that is manufactured offsite with all ingredients already incorporated into rolls of material. Launched in the 1965 when the first EPDM roof membrane was created (more about that below), single-ply systems consist of one layer (or ply) of membrane applied to the roofing substrate. Several types of single-ply roofing are in common use.  
    • Thermoset roofing incorporates polymers that are chemically cross-linked or vulcanized and is rigid once applied. EPDM (ethylene propylene diene monomer) is a type of synthetic rubber that for roofing purposes comes in varying thicknesses, in rolls up to 50 feet wide and 200 feet long. Lasting 15 to 20 years, EPDM roofs are durable, cost-effective, and fire- and weather-resistant. Downsides are seams between membranes that can fail and a utilitarian rubber look that’s effective but not particularly attractive.  
    • Thermoplastic roofing is made of synthetic substances that soften when heated, harden when cooled, and can be reshaped over time. It comes in two types: TPO (thermoplastic polyolefin) and PVC (polyvinyl chloride); the latter includes added plasticizers, the former does not, giving each unique properties suited to various situations. Both substances are impact and chemical-resistant, with a highly reflective white membrane that repels sunlight and helps energy efficiency. While upfront costs are higher than other options, long-term durability (20+ years) helps offset initial investment.  


  • Built-up roofing or BUR has been around for more than 100 years so is obviously very effective. This tar-and-gravel system consists of multiple, alternating layers of reinforcing fabrics adhered with asphalt and topped with a protective layer of gravel or stone. Because BUR is manufactured on the roof, this method is hot, messy, slow, and disruptive. It’s also heavy and leaks and tears are difficult to find and fix. Affordability is a big upside, along with as many built-up, redundant layers of protection as you want.  
  • Modified bitumen roofing is similar to BUR but with fewer layers and more adhesive options. Plies are sealed down to the roof with no seams, making the system strong, energy-efficient, and tear-resistant. But it’s not inexpensive, can be vulnerable to UV damage, and is prone to breakdowns if water is allowed to pond.

Like we said at the beginning: commercial roofs are complicated, as these brief descriptions make clear. And while each of these low-slope systems is effective, choices regarding which one to use must be site- and purpose-specific. The reward is knowing your facility is well protected and the valuable activity inside it secured.