Blog – Expert Roofing Advice & Tips

The Benefits of a Modified Bitumen Flat Roof

Flat roofs are most often used in commercial and industrials buildings. They are gaining in popularity for residential applications too. And, in all cases, a modified bitumen flat roof offers many advantages.

A modern take on the old built-up roofing (BUR) system, modified bitumen flat roofing is a single ply system made of asphalt bitumen, modified with polymers and reinforced with fiberglass and/or polyester.

It’s this combination of materials that gives modified bitumen (mod-bit) flat roofing advantages that few other roofing systems can match.

Here are the advantages to a Bitumen Flat Roof:

Extremely Puncture and Tear Resistant

The advantage here might not be mod-bit’s strength against damage, but the peace of mind it offers. The fiberglass and polyester layers can handle anything the roof faces, from foot traffic to wind-borne storm damage.


Yet another “peace of mind’ advantage is the fact that you won’t have to worry about replacing a mod-bit flat roof for a very long time. The same strength that gives its indestructibility gives it a lifespan to match.


Flat roofs are notorious for gaps forming in the seams and between the roofing and flashing. Mod-bit roofs expand and contract according to temperature without losing their shape or adhesion.

Easy Maintenance and Repair

If a repair or reinforcement is ever needed, they are generally done with mod-bit patches that are as secure as the original roof. They are usually quick and easy to apply meaning less costly downtime and, in the case of emergency repairs, a fast, reliable fix.


Mod-bit roofs can be installed to offer high solar reflectivity and thermal emission. That reduces your energy usage and heating and air conditioning costs. And it’s much better for the environment.

If you would like to learn more about modified bitumen flat roofs and their advantages for your home or business, contact Chouinard Bros. today.

Please note: Chouinard Bros. does not recommend any homeowner complete repairs to their roof of their own. Our technicians are skilled at performing this work and have received years of training to understand how to complete repairs safely.

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