Types of commercial roofing systems include TPO, EPDM, PVC, modified bitumen, built-up roofing, metal roofing, and spray polyurethane foam. These are some of the most common systems building owners and property managers compare when planning a new commercial roof or replacement.
Commercial roofing is different from residential roofing in a few important ways. Most commercial buildings have flat or low-slope roof designs, which means drainage, seams, rooftop equipment, and long-term maintenance all play a bigger role in choosing the right system. NRCA’s membrane-roof guidance specifically focuses on low-slope membrane types and the design considerations that go with them.
The best commercial roof is not just the one with the lowest upfront price. It is the one that fits your building, your budget, your maintenance expectations, and the demands of your property over time.
Why the Roofing System Matters
A commercial roof does more than keep rain out.
It helps protect the structure, insulation, tenants, equipment, inventory, and daily operations inside the building. GAF and NRCA both frame commercial roofing as a full roof system, not just a surface material, which is why material choice matters so much.
That is also why it helps to understand the strengths and tradeoffs of each roofing option before making a decision.
1. TPO Roofing
TPO, short for thermoplastic polyolefin, is one of the most widely used commercial roofing systems today. Carlisle says TPO is the largest segment in the commercial roofing industry, and GAF says TPO makes up more than 50% of single-ply roof installations in its commercial materials guidance.
Why building owners choose TPO
- Reflective surface that can help with energy efficiency
- Heat-welded seams
- Strong popularity in the low-slope market
- Good fit for many standard commercial buildings
Best fit
TPO is often a strong choice for owners who want a widely used, energy-conscious membrane system for a low-slope building.
2. EPDM Roofing
EPDM is a rubber roofing membrane with a long history in commercial roofing. Carlisle describes EPDM as a contractor-friendly option for new construction and re-roofing, with uses in adhered, ballasted, and mechanically attached assemblies.
Why building owners choose EPDM
- Proven track record
- Good flexibility
- Strong weather resistance
- Common option for low-slope assemblies
Best fit
EPDM is often a good fit for buildings that need a proven membrane system and owners who value familiarity and long-term performance.
3. PVC Roofing
PVC is another single-ply commercial roofing membrane. Carlisle says PVC membranes provide protection and resistance to chemicals, grease, fire, and punctures, which is one reason they are often used on more demanding buildings.
Why building owners choose PVC
- Heat-welded seams
- Strong chemical and grease resistance
- Good puncture resistance
- Reliable option for certain industrial or food-service buildings
Best fit
PVC is often a smart choice when chemical exposure, grease resistance, or seam strength are high priorities.
4. Modified Bitumen Roofing
Modified bitumen is an asphalt-based roofing system designed for low-slope applications. Johns Manville and GAF both include modified bitumen in their core commercial roofing system offerings.
Why building owners choose modified bitumen
- Durable asphalt-based protection
- Good fit for low-slope roofs
- Multiple installation methods
- Often chosen when toughness and repairability matter
Best fit
Modified bitumen is often used on buildings that need a durable, time-tested roof system with strong waterproofing performance.
5. Built-Up Roofing (BUR)
Built-up roofing, often called BUR, is one of the more traditional commercial roofing systems. Johns Manville says BUR uses alternating layers of bitumen and reinforcing felts, creating a redundant waterproof membrane with strong resistance to water and weather.
Why building owners choose BUR
- Multi-layer construction
- Long history in commercial roofing
- Strong waterproofing approach
- Good option where redundancy matters
Best fit
BUR is often a fit for owners who prefer a traditional layered roofing system on a low-slope commercial building.
6. Metal Roofing
Metal roofing is not just for residential homes. It is also used on commercial buildings, especially where long service life, durability, and architectural appearance matter. Johns Manville includes metal among the broader categories commercial owners compare when planning systems and assemblies, and commercial roofing guidance commonly positions it as a long-life option.
Why building owners choose metal roofing
- Long service life
- Durable exterior performance
- Lower maintenance in many applications
- Strong fit for certain sloped or architectural commercial roofs
Best fit
Metal roofing is often a strong choice for owners who care more about longevity and durability than the lowest initial cost.
7. Spray Polyurethane Foam (SPF)
Spray polyurethane foam, or SPF, is a commercial roofing option that combines a seamless applied surface with insulating value. Johns Manville includes liquid-applied systems in its commercial roofing lineup, and NRCA’s current membrane-roof manual scope includes liquid-applied systems among modern membrane roof types.
Why building owners choose SPF
- Seamless application
- Added insulation value
- Useful in some retrofit situations
- Can work well on selected low-slope roofs
Best fit
SPF can be a good fit for buildings where insulation performance and a fluid-applied approach are part of the goal.
Commercial Roofing Systems at a Glance
| Roofing System | Main Strength | Best Fit |
| TPO | Reflective surface and welded seams | Standard low-slope commercial roofs |
| EPDM | Proven durability and flexibility | Owners wanting a long-used membrane |
| PVC | Chemical and grease resistance | Restaurants, industrial buildings |
| Modified Bitumen | Durable asphalt-based protection | Low-slope roofs needing toughness |
| BUR | Multi-layer redundancy | Traditional commercial applications |
| Metal | Long life and durability | Sloped or architectural commercial roofs |
| SPF | Seamless application and insulation value | Retrofit and selected low-slope roofs |
How to Choose Between Types of Commercial Roofing Systems
If you are narrowing down the types of commercial roofing systems for your building, start with a few practical questions.
What is the slope of the roof?
Low-slope roofs usually point owners toward systems like TPO, EPDM, PVC, modified bitumen, BUR, or liquid-applied options.
What does the building need from the roof?
Some buildings need reflectivity. Others need chemical resistance, puncture resistance, flexibility, or added insulation value. Different systems are built around different strengths.
How much rooftop traffic or equipment is there?
HVAC units, penetrations, service traffic, and grease exposure can all influence which system makes the most sense.
What matters more right now, budget or long-term value?
Some systems are chosen for lower upfront cost, while others are chosen for durability or a longer service life.
What kind of maintenance plan is realistic?
Even the best roofing system still needs inspections and upkeep. NRCA’s roofing guidance and GAF’s commercial materials resources both reinforce that system design and ongoing care matter for long-term performance.
Final Thoughts
When you compare types of commercial roofing systems, the right answer usually comes down to building needs, not trends.
TPO, EPDM, PVC, modified bitumen, BUR, metal, and SPF all have a place in commercial roofing. The smartest choice is the one that fits your building’s design, usage, maintenance expectations, and long-term plans.
If you are weighing the different types of commercial roofing systems for your property, Performance Roofing can help you compare options and understand what makes the most sense for your building. Our team provides commercial roof inspections, clear recommendations, and practical solutions built around long-term performance.
FAQs About Types of Commercial Roofing Systems
What is the most common commercial roofing system?
TPO is commonly described as one of the most popular commercial roofing systems today, and Carlisle calls it the largest segment in the commercial roofing industry.
What is the difference between TPO and EPDM?
TPO is a thermoplastic membrane known for reflective surfaces and heat-welded seams, while EPDM is a rubber membrane known for flexibility and a long track record in commercial roofing.
Which commercial roofing system lasts the longest?
There is not one universal answer. Longevity depends on the system, installation quality, climate, rooftop conditions, and maintenance. Metal is often chosen for long service life, but well-installed membrane and asphaltic systems can also perform well over time.
What is the best commercial roofing system?
There is no single best option for every building. The best fit depends on roof slope, building use, exposure conditions, budget, and long-term goals.