3 Important Things to Know about Installing a Modified Bitumen Roofing System

Posted on: 30 September 2020

When it comes to installing a new roof on your commercial property, one of your material options is a modified bitumen roof. A modified bitumen (MB) is an asphalt-style roofing system that is used for low-slope roofs, like those found on commercial buildings. Here are some things to know about modified bitumen roofing. 

#1: MB Roofs Have Five Layers

It is important you understand that MB roofs have five layers in total. First, there will be an insulation level that will help provide thermal resistance and provide your building with temperature stability. Second is the membrane layer that is made of copolymer that is combined with either a fiberglass reinforcement or with polyester reinforcement. Third, there are modified fiberglass base sheets. These sheets are covered with MB asphalt. The fourth layer contains an adhesive bonding agent that is waterproof as well. Finally, the fifth layer is the exposed surface layer of the MB roofing system. This layer is the one that is designed to be weather-resistance and that protects the overall structure from ultraviolet rays.

#2: There Are Two Different Primary Types of MB Roofs

When it comes to the outer layer of the roof, there are two different types of MB outer roofing materials that you can use: an Atactic Polypropylene Bitumen (APP) or a Styrene-Butadiene Styrene (SBS).

With an APP system, the asphalt has more of a plastic-like quality. A thermoplastic polymer is added to the mixture, which helps the roof more effectively protect against UV light and better resist water.

With an SBS system, the addition of the styrene-butadiene-styrene helps give the bitumen more of a rubber-type surface. This type of system is easier to install if you are looking to cut down on the required installation labor.

#3: MB Roofs Offer Solid Benefits

MB roofs offer some solid benefits over other low-slope and flat roof systems. An MB roof is considered tear resistant due to the use of five different layers in the construction of the roof. MB materials respond to heat changes by expanding and contracting without damaging the structure of the roofing material. It can help reflect solar heat energy to keep your building cool. Additionally, MB roofs are designed to be waterproof and are easy to patch up.

If you are looking for an affordable and solid roofing system, a modified bitumen system is a great choice. Discuss installing an MB roof with companies such as Ultimate Choice Roofing.