Modified Bitumen systems consist of asphalt with modifiers added to give it durability.
These are either one, two ( most common ), or three ply-systems.
They are factory manufactured and combine the redundancy of built up roofing with the ease of application of a single-ply system.

There are two types of Modified Bitumen Roofing Systems. Styrene Butadiene Styrene (SBS) systems, which are installed with hot asphalts or cold adhesives. and Atactic Polypropylene (APP) systems which are usually installed using the propane torch method.

Both Styrene Butadiene Styrene roofing systems and Atactic Polypropylene roofing systems can be reinforced either with glass or with polyester. Among the advantages these systems offer:
The rolls of these roofing materials are factory-manufactured, ensuring quality control.
These systems are well-suited to expand or contract with the movement of the building they protect.
The modified bitumen roof systems can be finished with a variety of surfaces that enhance their resistance to oxidation and damage from UV rays.


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