Today, we take a look at the different commercial roofing systems that are installed on top of flat and low-slope buildings across America.
Types of Flat and Low Slope Roof Systems Today

- Built-up roofing
- Metal roofing
- Modified bitumen roofing
- Single-ply roofing
- Spray polyurethane foam (SPF roofing)
Low-slope roof systems may include several functional components, such as:
- Reinforcement, which can add strength, stability, and dimensional support to a roofing system.
- Weatherproofing layers, which help prevent water from entering the roof assembly.
- Surfacing, which may protect underlying roofing materials from ultraviolet exposure, weathering, traffic, or other conditions. Some surfacing materials can also provide reflective or other performance characteristics.
We cover each type of commercial roof mentioned above below.
Roof Types and Their Features
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The reinforcement layers may be referred to as roof felts or ply sheets. Depending on the system, built-up roofing may be installed over insulation or an appropriate roof deck or substrate.
The bitumen used in BUR systems may include asphalt or other compatible materials. Surfacing can include aggregate such as gravel or slag, mineral-surfaced cap sheets, coatings, or other protective materials.
Metal roofing—Metal roofing is widely used on commercial buildings. Materials may include galvanized steel, coated steel, stainless steel, copper, aluminum, and other metal roofing products.
Metal roofs can develop corrosion, loose fasteners, failed seams, coating deterioration, or other problems over time depending on the material, environment, installation, and maintenance.
Protective coatings may be applied to suitable metal roofing systems for purposes such as corrosion protection, reflectivity, or restoration. Coating materials and preparation requirements vary by roof type and product.
Pros & Cons of Various Roofing Systems
Learn MoreGenerally speaking, two common types are SBS polymer-modified bitumen membranes and APP polymer-modified bitumen membranes. Installation methods can include hot asphalt, cold adhesives, self-adhered applications, heat welding, or torch application depending on the specific product.
Surfacing may include aggregate, mineral surfaces, coatings, or metal foil, depending on the roofing system.
Single-ply roofing—Single-ply roofing membranes are factory-manufactured sheets. Generally speaking, there are two major categories: thermoplastic membranes, including PVC and TPO, and thermoset membranes, including EPDM rubber roofing.
Single-ply systems may be fully adhered, mechanically attached, or ballasted depending on the membrane and roof design. Reinforcement may include polyester fabrics, scrims, glass fiber, fleece backings, or other materials depending on the product.
SPF roofing—SPF roofing is created by applying liquid components that react and expand to form a rigid spray polyurethane foam layer over a suitable substrate.
The foam can be applied at different thicknesses to provide insulation value and, in properly designed applications, may also be used to help create slope for drainage.
Because spray polyurethane foam requires protection from ultraviolet exposure and weathering, a compatible protective coating or other surfacing system is installed over the foam.
Common protective coatings used with SPF roofing may include:
- Polyurethane coatings
- Acrylic coatings
- Silicone coatings
- Other compatible protective coatings specified for the SPF system
SPF installation requires specialized equipment, proper application conditions, and experienced installers. The protective surface also needs regular inspection and maintenance.
Concluding Thoughts
There are many commercial roofing types available today, and each has its own advantages, disadvantages, maintenance needs, and potential problems.
Over time, commercial roofing systems can experience leaks, weathering, membrane deterioration, corrosion, damaged seams or penetrations, drainage problems, or other conditions.
When an existing roof is structurally sound and otherwise suitable for restoration, a coating or other restoration system may provide a cost-effective alternative to full replacement and may help extend the useful life of the existing roof.
Before restoration, the roof should be evaluated for wet insulation, structural deterioration, serious drainage problems, damaged roofing materials, failed seams or penetrations, trapped moisture, and other conditions that may need to be corrected first.
A commercial roofing contractor can inspect the existing roof and discuss whether repair, restoration, recover, or replacement is appropriate.

First, before discussing the dynamics of the roofing industry, we need to define the business cycle. Put simply, a business cycle is a reference to a period of time in which ebbs and flows in economic activity – such as production levels – take place within an economy. The period of time in a business cycle can range from several months to several years.
There are some huge business opportunities in the commercial roofing industry. In just 2014, commercial roofing sales are estimated to reach a value of $5.3 billion. But how do you even get commercial roofing projects to start with?

For long-term sustainability, it is obvious that you must keep bringing revenues in to keep your doors open. In this post, we discuss what is involved at this stage of business development, factors to keep in mind, and the advantages offered by our
Membership in our nationwide contractor network helps you fulfill the following suggestions above with the following:
Naturally, the most powerful way to generate leads and obtain jobs is to get in front of building owners yourself and demonstrate how you offer them value. Nothing beats in-person contact as the best form of marketing, but thanks to new technology, there are now many other techniques available that let you interact with many people at one time.
Today, we discuss the third part of our “
In addition to enabling you to fast-track your roofing knowledge, our group offers you access to highly successful contractors who will coach you on effective sales techniques and additional practical roofing knowledge. Choice Roof Contractors have access to these highly successful industry professionals for the lifetime of their businesses, ensuring they can have any question or concern quickly answered.
This is the most important reason behind why you should use quality materials.
beginning of 2014 has been a tremendously exciting period for Choice Roof Contractor Group: we are continuing to see greater interest from prospective members across the United States and rapid growth in our membership base. A recent event that our leadership hosted in Middlebury, Indiana, though, offered a glimpse into the gathering momentum that our contractor network is currently undergoing.
the attendees’ reception of the powerful benefits that our network has to offer, along with the inspiring presentations by highly successful commercial roofing business owners within our network, was exceptionally strong.

Mr. Keim commented, “The meeting was a tremendous success, and I can hardly wait to do the next one. It was great talking one-on-one with many of the contractors who attended and seeing their excitement for what we’re doing. Notably, three of the contractors in the area who attended were actually in the commercial roofing industry already and actively using the Conklin roofing systems. They were very impressed by our nationwide platform, and all of them have already begun the membership process.”
commercial roofing sales projected to reach $5.3 billion in 2014 and residential and commercial roofing sales expected to increase to $27.2 billion in 2017, there has never been a better time for starting a roofing business. But it will not be easy to gain a sizable piece of this growing market, as economic conditions remain tight, building owners are trimming down their expenditures, and roofing contractors are becoming more competitive in their bidding.
For 2014, domestic market estimates are positive. According to the building products research firm Principia, U.S. commercial roofing sales will top off at approximately $5.3 billion this year. Around 6.6 million square feet of roofing products estimated to be installed in 2014 will account for those roofing sales.