Commercial Modified Bitumen Roofing
We provide top quality commercial roofing services throughout Southeast Wisconsin
Modified Bitumen (MB) is an asphalt roofing membrane with Attactic Polypropylene (APP) or Styrene Butadiene Styrene (SBS) additives which give it properties similar to thermoplastic or rubber. Fiberglass or polyester fibers are added during manufacture to enhance durability. It comes in rolls with a variety of surfaces ranging from smooth to a coating of mineral granules, copper, aluminum or gravel.
SBS modified bitumen roofs are installed with hot asphalt or cold adhesive, while APP modified bitumen roofs are almost always installed with a heat torch. To ensure proper drainage, modified bitumen roofing is only recommended for roofs with a slope greater than ¼” per horizontal foot.
Modified Bitumen vs Roll Roofing – Which One is Better?
When it comes to installing flat roofing, many people believe modified bitumen is the same as roll roofing. Modified Bitumen (MB) is a roofing material made of tough Styrene Butadiene Styrene or Atactic Polypropylene, which are both resistant to tearing. Roll roofing, on the other hand, is made of thinner material and tears more easily, meaning it usually needs nails and roof cement to install it. MB is often reinforced with fiberglass, polyester, or a combination of the two to give it a tougher membrane and make it waterproof. MB lasts longer than roll roofing, and keeps commercial roofs protected for years down the road.
When it comes down to it, Modified Bitumen is the preferable choice when installing new flat roofing material on your commercial building. Contact Alois Roofing & Sheet Metal today to learn more about Modified Bitumen.
Frequently Asked Questions
Modified Bitumen roofing is a multi-layer asphalt-based roofing type commonly used for flat roofs with low slopes.
When Modified Bitumen roofs need repairs there are a couple of different things that can be done. The most common method is to apply a patch that is adhered over a puncture/tear and provides extended coverage of a couple inches to ensure full protection.
After a layer of insulation is installed, Modified Bitumen can begin being installed. This can be done in a couple of different ways including self-adhered, torched down or cold adhered.
Like any installation, the roof's shape and size have to be taken into account. Depending on the type of Modified Bitumen used and the square footage prices can vary anywhere from $4,000 to $7,000.
Characteristics of Modified Bitumen Roofing
- Expands and contracts with the movement of the building and temperature changes
- Resists water intrusion and withstands foot traffic
- Several surface finish options available to increase resistance to UV damage and oxidation
- Can be surfaced with a reflective coating to extend the service life of the roof
- Available in black or white
How long does a modified bitumen roof last?
As with any roofing system, the quality of the installation and environmental conditions will affect the service life. The modified bitumen roofs we install typically have a service life of 20 to 30 years.