Flat Roofing

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Commercial Flat Roofing

Protecting the integrity of your Missouri or Illinois business.

Flat roofing is the most common commercial roof choice in Missouri and Illinois. Known for their durability and low cost, they are ideal for buildings both small and large alike. The ULTIMA Roofing & Exterior team understands the unique needs of commercial flat roofing and how to deliver the servicing these roofs require.

Common Flat Roof Problems

Flat roofs, while durable, are prone to certain problems. It is essential that anyone installing or repairing a flat commercial roof understands what issues are common and how to avoid them. These include:

Standing Water

Flat roofs do not drain water as easily as pitched roofs. It is important that the slope of the roof be carefully designed and maintained.

Poor Installation

Many companies that specialize in residential roofs will also install commercial ones but lack the experience needed to do a good job.


Commercial buildings need to place heavy objects on their roofs, but it is common for employees to drag them around. This damages the membrane and substrate.


Regular maintenance is critical to flat roofs. Without it, the roof will deteriorate long before its lifespan should be over.

Damaged Insulation

When heavy equipment is placed on the roof, it can compress the insulation. This will cause it to dissolve and allow the screws to tear at the membrane.

Our Commercial Flat Roofing Services

We offer a comprehensive slate of commercial flat roofing services designed to keep your business safe and functional. Our team handles installation, repair, replacement, and maintenance of numerous types of flat roofs.

TPO Roofing

Thermoplastic Polyolefin (TPOP) is a single-ply roofing membrane designed for use in commercial flat roofing systems. Since it uses just a single layer of synthetics plus reinforcing scrim, it is a popular and lightweight option.

Asphalt Roof Repair

Standing for Poly Vinyl Chloride, PVC flat roofing is mechanically fastened to the structure. In some cases, adhesives are also used to hold it in place. To ensure it is waterproof, the seams are hot air welded. Because PVC roofing has a white membrane, it reflects UV rays and helps with energy efficiency.

Asphalt Roof Replacement

Ethylene Propylene Diene Monomer (EPDM) is a synthetic rubber made from oil and natural gas. The installation is similar to that of PVC roofing, but where PVC is plastic, EPDM is rubber. It has been gaining in popularity due to its durability and affordability.

Modified Bitumen

Modified bitumen roofs are single-ply rolls that are applied to the roof’s surface. In application, they are similar to asphalt roofs, but they utilize polymers that help to make the roof more resistant to the elements and extend its lifespan.


Flat commercial roofs require coatings to keep them at their best. Which type of coating is needed will depend on the materials of your roof and your goals. Our roofing technicians will be able to determine which coatings are correct for your business.