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Commercial Roofing Types: Advantages and Disadvantages They Provide

Commercial Roof Types Advantages And Disadvantages

Table of Contents

There are advantages and disadvantages to every type of commercial roofing system. This article will give you an overview of the most widely used types of roofs so that you can make more informed decisions on your commercial roofing types.

Sentry Roofing installs and repairs flat roofs, low-slope roofs, metal retrofit roofs and membrane roofs. The brands we use are Duro-Last, Firestone and GAF.

Below is an examination of these commercial roofing types, the materials, and the advantages and disadvantages of each type of roof. Throughout this, we are also referring to industrial roofs and industrial roof types as well.

Key Takeaways

Roof Type Materials Used Top Manufacturers Pros Cons
Flat Roofs EPDM, PVC, TPO, Bitumen, Modified Bitumen, Rubber Rolled Roofing GAF, Holcim Elevate (formerly Firestone), Verisco Cost-effective, easier and quicker to install, flexible material choices, supports rooftop utilities, easy maintenance Poor drainage, prone to standing water, material degradation
Low-Sloped Roofs EPDM, PVC, TPO, Bitumen, Modified Bitumen, Rubber Rolled Roofing GAF, Holcim Elevate (formerly Firestone), Verisco Better water runoff, safer and more affordable than pitched roofs, variety in materials, supports rooftop utilities Heavy snow can cause damage
Pitched Roofs Commonly shingles, tiles, metal Owens Corning, CertainTeed, TAMKO Greater runoff for water and snow, less risk for water buildup Difficult maintenance and repair, increased safety procedures, higher costs
Metal Retrofit Durable Membrane over metal roof structure Duro-Last, GAF, Holcim Elevate (formerly Firestone) Cost-effective, extends roof life, allows for normal operations during installation, eco-friendly, improves insulation Shorter lifespan than a complete metal roof replacement
PVC Membrane PVC (Polyvinyl Chloride) Duro-Last, IB Roof Systems, Johns Manville Durability, fire retardant, moisture, wind, and chemical resistant, energy efficient, variety of color choices Higher upfront cost compared to other materials
TPO Membrane TPO (Thermoplastic Polyolefin) GAF, GenFlex, Carlisle SynTec Affordable, durable, flexible, eco-friendly, lightweight, variety in colors, heat reflective Shorter track record, questions about longevity compared to other materials
EPDM Membrane EPDM (Ethylene Propylene Diene Monomer) Carlisle SynTec, GenFlex, Holcim Elevate (formerly Firestone) Suited for cooler climates, durable, stretchable, multiple insulation options, available in white for heat reflection Vulnerable to shrinkage and tear in hot weather, UV degradation of adhesives/seams
Green Roofing Vegetation, Soil, Waterproof Membrane, Drainage Layers N/A (varies widely based on project specifics) Improves building insulation, reduces urban heat island effect, promotes biodiversity, manages stormwater Higher initial costs, requires ongoing maintenance, structural requirements for weight support
Spray Foam Roofing Polyurethane Foam, Protective Coatings N/A (varies by region and application) Excellent insulation, seamless and waterproof, lightweight, versatile for various roof shapes Requires expert installation, sensitive to moisture during installation, may require recoating over time
Metal Roofing Steel, Aluminum, Copper, Metal Alloys Englert, TAMKO, CertainTeed Long lifespan, durable, fire-resistant, energy-efficient, recyclable Can be more expensive, noise during rain or hail, requires periodic maintenance

Types of Roofs

The following are the most common commercial roof types:

  • Flat Roofs
  • Low-Sloped Roofs
  • Pitched Roofs

Types of Commercial Roofing Materials

The following are the most common types of commercial roofing materials:

  • Metal Retrofit
  • PVC
  • TPO
  • EPDM
  • Metal
  • Green
  • Spray Foam

Commercial Flat Roofs: Pros & Cons

Commercial Flat Roofs

Flat roofs are one of the most common types of roof for commercial buildings.

Since the 1920s, flat roof systems have been a symbol of commercial & industrial commerce and a more ‘modern’ America. Before this, pitched roofs were the most common architecture, even for larger commercial structures.

For building owners and roofing contractors throughout the world, the transition to flat roof types offer many benefits.

Advantages of Flat Roofs

Commercial flat roofs can be significantly more cost effective to build than pitched roofs or steep slope roofs because they require less material due to the fewer square feet to be covered.

They are easier and quicker to install, which can translate to a significant savings for the building owner. This also effects the ease and potential price of your next commercial roof repair.

Owners have many types of flat roofing materials and membranes to choose from – rubber rolled roofing, EPDM, PVC, TPO, bitumen, modified bitumen and built-up roofing.

While there are many different color choices to choose from with roofing membranes, however many building owners choose to stick with white.

This can help reduce energy waste from cooling costs due to it’s reflective properties.

Air conditioners can be moved from the ground to the roof. Solar panels and satellite dishes are easier to install on flat roofs than on pitched ones. These items are then less obvious from the curb or parking lot.

Maintenance and drain cleaning is easier on flat roofs since workmen can walk easily and safely, regardless of weather conditions.

Disadvantages of Flat Roofs

One of the most important disadvantages of flat roofs is poor drainage.

Standing water can degrade the roofing materials long before they normally would. One of the advantages of pitched roof styled buildings is not having to worry as much about drainage issues.

Material breakdown leads to leaking and water damage inside the building.

It is imperative that an experienced commercial roofing contractor with a good reputation for professional work do the installation or repairs in order to avoid problems with the roof.

The experienced team at Sentry Roofing understands where the drains must be located and the proper height to avoid puddling.

Are you trying to find the best contractor for your commercial roofing project & considering several bids?

Commercial Low-Sloped Roofs: Pros & Cons

Duro-Last Low Slope Roof Installation Membrane Williamsport, Indiana

Low-sloped roofs are often found on factories, warehouses, apartment buildings and other industrial buildings. They may first appear to be flat but they actually have a slight pitch.

Advantages of Low-Sloped Roofs

The pitch of low-sloped roofs allows for water runoff. The roof design directs the water to where it should go, such as valleys, saddles and drains. Roof area is less than with high-pitched roofs, requiring fewer square footage of roofing materials.

Low-sloped roofs offer easier and safer conditions for roofers to work on than high-pitched roofs or steep slope roofs.

Commercial roof installation, repair and replacement is easier to perform. There is less chance that the building owner will need to call repairmen out to manage water problems, since the slight pitch does not allow for standing water or puddling.

Air conditioners, solar panels and satellite dishes are easier to install and maintain on low-sloped commercial roofs than on roofs with a higher pitch.

The same variety of materials that are used on commercial flat roofs can be used on low-sloped roofs – rubber rolled roofing, EPDM, TPO, bitumen and modified bitumen. Modified bitumen have longer warranty times due to the additional thickness and superior sealing capabilities.

Disadvantages of Low-Sloped Roofs

Heavy snows that do not melt quickly can add weight to the roof. Building codes regarding low-sloped roof for your area must be adhered to precisely.

Commercial Pitched Roofs: Pros & Cons

Pitched Roof Type

While pitched roofs are seen in residential homes more than commercial buildings, they are still commonly used alongside flat and low-sloped rooftops.

Advantages of Pitched Roofs

The main positive aspect of pitched roofs is that the increased slope provides greater runoff for water and snow.

The steeper the roof structure, the easier it is for liquid and debris to roll off. Ultimately this means less risk for water buildup that could lead to leaks and mold damage.

Overall, having a steep-sloped roof could reduce your needs of repair and maintenance a bit compared to a flatter, less inclined roof.

Disadvantages of Pitched Roofs

Unfortunately, with the steep incline of a pitched roof it is significantly more difficult to perform maintenance and repair.

The need for increased safety procedures, transferring materials and difficulty maneuvering around the roof generally increases the costs of each individual installation, repair or maintenance service.

Commercial Metal Retrofit Roofing: Pros & Cons

Duro-Last Metal Retrofit Roof Overview Danville IL Crossroads Christian Church

Metal retrofit roofing is a simple, cost-effective method of re-roofing your older, end-of-life metal roof with a durable membrane.

Advantages of Metal Retrofit Roofs

The biggest advantage is the cost of the retrofitting your metal roof. This material not only greatly extends the life of your roof, it doesn’t cost as much as your standard metal roof replacement.

During installation, the original metal roof provides protection to your building’s interior so you can continue day-to-day operations while the work is being done. This protects your employees, your inventory, and doesn’t interrupt production.

Retrofitting is also eco-friendly. By not taking the roof apart and damaging / scrapping the materials, this reduces landfill waste, making re-roofing an appealing option for the environmentally-conscious.

When you retrofit over a metal roof, you are taking advantage of reusing your current roof insulation, as well as additional insulation from the membrane. This can help save on energy costs and keep building temperature regulated.

Disadvantages of Metal Retrofit Roofs

While having a metal retrofit roof installed over your existing metal roof can extend the life of your roof by up to 20 years, a complete metal roof installation is generally estimated to last between 30 – 60 years.

Keep in mind that comes at a significant cost increase, and can be more cost-effective to simply retrofit.

Learn more about repairing or replacing your current metal roofing system with a durable metal retrofit system.

Commercial PVC Membrane Materials: Pros & Cons

PVC Membrane Roofing System

Polyvinyl chloride (PVC) is one of the most popular and time-tested membrane material used in roofing today. Sentry Roofing only uses premium Duro-Last PVC membranes.

Advantages of PVC Membranes

By far one of the largest advantages of PVC roofing materials would be it’s durability, longevity, and fire retardant properties.

This membrane has been flame tested alongside other similar membranes with very surprising outcomes.

While a TPO and EPDM membrane can continue to burn, spread and melt the material, the Duro-Last PVC membrane will work to self-extinguish the flames.

This is incredibly important for your rooftop should any fires occur.

Instead of huge areas of membrane melting away during a rooftop fire like with other membrane materials, PVC works to help self-extinguish the flames.


Vinyl Test Video

This ultimately leaves you with more roofing membrane left and less to have to replace or repair.

In addition to great fire resistance properties, PVC is also resistant to moisture, wind and chemicals as well as being tear and puncture resistant.

Due to the light colored membrane sheets and thicker insulation, it is also highly energy efficient. Reduce costs on your heating and cooling bills and avoid a heat island effect if you live in hotter areas.

Disadvantages of PVC Membranes

The only real downside that might be considered for some building owners is the slightly higher up-front cost of PVC roofing compared to TPO or EPDM.

However this is a small price to pay for the durability, longevity, energy efficiency, warranty and fire resistance that PVC has.

Commercial TPO Membrane Materials: Pros & Cons

TPO Membrane Roofing System Roll

Thermoplastic polyolefin (TPO) is a newer style of commercial roofing membrane. First used as a roofing material in 1986, it is praised for being an affordable, cost-effective alternative to PVC.

Advantages of TPO Membranes

Today, TPO is one of the most common single-ply roofing membrane used with sales growing at a double-digit rate year over year.

Many building owners have chose TPO materials over other options due to a cheaper up-front cost compared to other materials.

Thermoplastic polyolefin has been compared to PVC and EPDM roofing materials a lot due to similar properties they share.

TPO membranes are very durable and flexible, which makes custom edge-to-edge fabrication simpler, cheaper and more efficient. The flexibility helps the material stretch and adapt to your building’s movement and setting.

Tpo Roof Custom Edge To Edge Fabrication

The material is also 100% recyclable and eco-friendly which is great for companies trying to go green.

The membrane is slick and good for moving water off the roof. Its lightweight property puts less stress on the building structure than does metal roofing.

The flexibility of membrane roofing materials allows commercial roofing contractors to mold the material to unique roof designs.

TPO membrane’s light color is good for reflecting heat away from the building. TPO membrane comes in white, tan, gray, green, red and blue. This material uses a hot-air gun to seal the seams.

Disadvantages of TPO Membranes

One of the biggest downsides to using TPO is that it simply hasn’t been used for roofing as long as other materials.

For that reason, some people question the longevity compared to PVC or EPDM roofs.

Commercial EPDM Membrane Materials: Pros & Cons

Epdm Roofing Material

EPDM stands for ethylene propylene diene methylene. This is a durable, darker synthetic rubber material primarily used in flat and low-sloped roofs nationwide.

Advantages of EPDM Membranes

While most EPDM rubber roofs are black, it can also come in a white coating which will help with reflecting the suns heat off of the rooftop.

Due to it’s rubber properties, it is able to easily stretch and form-fit to any roof.

EPDM roofing membrane has been on the market for over 60 years and has a good track record as a commercial roofing material.

Due to it’s darker color, it is a good choice for cooler climates. It’s highly durable rubber provides excellent protection from the weather. Seams are closed with adhesives or seam tape.

Since the membrane does not have its own insulation, the building owner has several insulation options to choose from.

Disadvantages of EPDM Membranes

Hot weather can cause the membrane to shrink, causing tear which lead to water getting under the membrane. Adhesives and seam tape can degrade from UV sunlight, allowing water to flow under the membrane.

Proper installation, maintenance and repair procedures are necessary to keep the membrane lasting longer.

Metal Roofing Systems: Pros and Cons

Commercial Metal Roofing Systems

Metal roofing systems are common on commercial and industrial buildings due to their durability and ‘modern’ look.

Advantages of Metal Roofing

Metal roofing systems, known for their durability, can last up to 40-70 years. They offer energy efficiency by reflecting sunlight, reducing cooling costs in the summer, which is beneficial in the Midwest’s warm months.

Their fire resistance, with a Class A fire rating, adds a layer of safety for commercial buildings. While they provide diverse aesthetic options, these advantages are tempered by certain practical considerations.

For the eco-conscious, metal roofs typically consist of up to 95% recycled materials and are 100% recyclable at the end of their lifespan.

Disadvantages of Metal Roofing

Despite their numerous benefits, metal roofing systems have certain drawbacks. The initial installation cost is higher than traditional roofing materials, which might be a significant consideration for budget-conscious projects.

Noise can be an issue during rain or hail storms, potentially disrupting activities in businesses that require a quiet environment. Certain metal types, like aluminum and copper, are more prone to denting, a concern in areas prone to hail or where falling debris is common.

In humid or wet environments, there’s a high risk of rust and corrosion, though this can often be mitigated with the right choice of materials and coatings.

The requirement for specialized installation expertise can pose a challenge, emphasizing the need for engaging skilled and experienced roofing contractors, and is generally going to add to the already higher upfront cost.

Green Roofing Systems: Pros and Cons

Green Roofing Vegetative Roofing Systems For Commercial Buildings

Going over a more unique roofing system, Green Roofing systems (also known as vegetative roofing systems) are an interesting concept for building owners who want to contribute positively to the environment.

Advantages of Green Roofing Systems

Green roofing systems, known for their environmental benefits, contribute significantly to urban biodiversity and help in managing stormwater.

These roofs provide natural insulation, which can lead to energy savings by moderating the temperature of the building.

Green roofs also improve air quality and offer an aesthetically pleasing environment, creating a natural habitat in urban settings.

They can extend the lifespan of a roof by protecting the underlying structure from climatic variations.

Disadvantages of Green Roofing Systems

While green roofs offer ecological benefits, they come with plenty of practical challenges. The initial installation and maintenance costs are considerably higher than traditional roofing options, including Duro-Last PVC systems.

Green roofs require a robust structural support due to the added weight of soil and vegetation. This might necessitate additional structural reinforcement, further increasing costs.

The complexity of installation and ongoing maintenance, such as irrigation, weeding, and ensuring the health of the vegetation, can be significant compared to the relatively low-maintenance and easy-to-install Duro-Last PVC roofing systems.

Green roofs might not be suitable for all building types, especially in areas where water conservation is critical (such as Texas or California), since they require regular watering and care to maintain the vegetation.

Spray Foam Roofing Systems: Pros and Cons

Spray Foam Roofing System With Walking Path And Skylight

Spray foam roofing uses a liquid polyurethane that expands into a foam, creating a solid layer across an existing roof. Known for its seamless application, spray foam roofing is particularly beneficial for buildings requiring superior insulation and weatherproofing.

Advantages of Spray Foam Roofing

Spray foam roofing offers exceptional insulation, significantly reducing energy costs due to its high R-value. Its seamless nature ensures a watertight seal, protecting the building from leaks and water damage.

This type of roofing is also lightweight, reducing the load on the building’s structure, and can conform to various roof shapes and designs, making it a versatile option for complex roofing needs.

Disadvantages of Spray Foam Roofing

Despite its benefits, spray foam roofing requires precise and professional installation to avoid issues such as uneven application, which can increase your upfront costs.

Liquid polyurethane can be sensitive to moisture and UV exposure, potentially leading to degradation if not properly coated and maintained.

Over time, spray foam roofing will need recoating to maintain its integrity, and improper installation can lead to significant maintenance challenges down the road.

Commercial Roof Types & Materials Summary

  • Flat Roofs – More cost effective, quicker and easier to install. Materials include rubber rolls, EPDM, PVC, TPO, bitumen, and modified bitumen. However flat roofs are more prone to standing water and material degradation.
  • Low Sloped Roofs – Allows for better water runoff which means less maintenance calls. Safer and cheaper than pitched roofs and can use the same materials. Heavy snows can weigh down and potentially cause damage.
  • Pitched Roofs – Best for water and snow runoff, but most dangerous for roofing crews. Pitched roof types generally have costlier maintenance and repair costs.
  • Metal Retrofit Roofs – Simple, cost-effective method of re-roofing a metal roof with a membrane system. Reuses your current roof structure and insulation making it environmentally friendly and structurally sound. Can greatly extend the life of a damaged roof.
  • PVC Membrane Roofs – The most popular and time-tested roofing material available. Duro-Last PVC roofing membranes are more durable, fire resistant and puncture resistant than most other membranes.
  • TPO Membrane Roofs – Light color, good for reflecting heat away from the building. Colors come in white, tan, gray, green, red, and blue. Seams are sealed with hot-air gun. However, easier to puncture and prone to shrinkage.
  • EPDM Membrane Roofs – Darker roofs, better suited for cooler climates. Made of a highly durable rubber providing protection from the weather. Seams are sealed with adhesives / seam tape. Also prone to holes and shrinkage.
  • Metal Roofs – Durable, with a lifespan of 40-70 years. Ideal for harsh weather but higher in initial cost and can be noisy during storms. Requires specialized installation and susceptible to dents, rust, and corrosion.
  • Green Roofs – Eco-friendly, enhancing biodiversity and insulation. Higher initial investment and maintenance needs, with structural reinforcement required. Not suitable for all climates or building types.
  • Spray Foam Roofs – Provides excellent insulation and waterproofing. Lightweight, durable, but needs professional installation and periodic maintenance. Prone to expansion and contraction and UV degradation.

Frequently Asked Questions

These are the most common questions and answers about commercial roofing, roof types, and roofing materials used.

What are the best commercial roofing materials?

The best and most common commercial and industrial roofing materials and systems are PVC, TPO, EPDM and metal retrofit roofing.

What are the most popular roofing styles for commercial buildings?

The most popular roof types for commercial buildings are flat roofs, low sloped roofs and pitched roofs.

What is commercial roofing?

Commercial roofing is the specialization of installing, repairing and maintaining large-scale roofing projects. Commercial & industrial roofing is drastically different from residential roofing and requires different training and uses different roofing systems. With commercial buildings, there is a lot more at stake over a greater surface area using different materials and systems.

How do I find the best contractor for my commercial roofing project?

You already have! Contact the experts at Sentry Roofing for a no cost, no obligation commercial roof inspection. Our process is built around creating the best experience for our clients as well as providing the most effective roofing system for your building.

What are the roofing system brands Sentry Roofing uses?

Sentry Roofing is proud to provide roofing systems from Duro-Last, GAF, Firestone and Verisco.

Still need help deciding the right type of roofing system for your building?

Contact our knowledgeable team for a no cost, no obligation rooftop evaluation.

12 Responses

  1. It’s good to know that flat roofs are significantly easier and quicker to install than other commercial roofing, which means that business owners would be able to save money if they have one installed. My dad mentioned the other night that he’s planning to open a hardware store downtown. If he proceeds with his plan and has a commercial building constructed, I’ll suggest using a flat roof for the installation. Thanks!

  2. Thank you for giving us a direct and straight to the point answer! It greatly helped in clearing our confusion.

  3. Constructing a flat roof might save company owners money since it is quicker and easier to install than other commercial roofing options. Thank you for this informative article.
    I’m looking forward to your next blog!

  4. I like that you mentioned that commercial flat roofs are more cost effective compared to the other options. I was driving on a highway yesterday and I just noticed how the commercial buildings below got varied types of roofs. Seems there are a lot of things to consider when it comes to roofs, so I think businesses should contact commercial roof installation services and ask them for help.

  5. I think flat roofs are the best choice among the roof types you mention. Your description shows that flat roofs are cost-effective because they require fewer materials than other roof types.
    I appreciate that you discussed popular roof types for commercial buildings, selecting flat, low-sloped, and pitched roofs. This roof type will be best for the warehouse.

  6. Getting an expert roofer is essential in doing the roof replacement or repairs.
    My son is planning to have his roof replaced. Thank you for letting me know about the roofer’s warranty. It’s good to know that there will be a contractor’s warranty. In case there will be improper installation or inappropriate material. I found it helpful when you mentioned asking for a comparative quote that can be used in getting the best deal.

  7. Thanks for writing this great article for us. I have gained good stuff from this website. Looking forward to your next article. I am happy to share this post to my friends. Keep it up.

  8. Thanks for sharing. I really appreciate it that you shared with us such informative post, great tips and very easy to understand.

  9. You have shared a wonderful blog for roofing services. It gives us best support to arrange our roofing work. I am very glad to find this kind of informative blog. Thanks for your wonderful effort.

  10. Very thankful for this wonderful article, it seem like it will really help with what I need to get done. Thank you very much for the post!

  11. Thank you for providing such a helpful overview of the different types of commercial roofing systems. It’s great to have all of this information in one place, and I appreciate how you’ve explained the advantages and disadvantages of each type of roof. It’s also good to know that Sentry Roofing installs and repairs several different types of commercial roofs, using trusted brands like Duro-Last, Firestone, and GAF. Your article is a valuable resource for anyone looking to make an informed decision about their commercial roofing needs.

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