Modified Bitumen & Built-up Roofing


Built Up (BUR) and Modified Bitumen (Mod Bit) Roofing Systems

What is Bitumen?

Bitumen (sometimes referred to as pitch) is a thick, oily byproduct of crude oil refining or steel coaking.


What do these systems have in common?

Built-Up and Modified Bitumen systems share many characteristics, chief among them is the use of bitumen as an adhesive for layers of felt, fabric, or matting.


Built-Up Roofing Systems

Time tested, water resistant.

Built-Up roof systems are constructed with layers of felt and bitumen (either asphalt or coal tar pitch) that are applied hot and left to cool. They are then covered with gravel, a mineral sheet cap, or other weather resistant coatings. Generally, BUR systems are three or four ply. The layering of the bitumen and felt provide enhanced water resistance.


Modified Bitumen

Customizable, single-ply.

Modified Bitumen systems combine the layers of a BUR system during the manufacturing process rather than during the application process, creating a single-ply application. Polymer modifiers can be added during the manufacturing process to give the roof additional elasticity, temperature flexibility, and weatherability.


Your One Stop Shop Commercial Roof Replacement Experts

48+ years of experience, Single Source warranty, 5A1 Dun & Bradstreet credit rating.

From inspection and installation to repairs and maintenance, CentiMark is committed to being your go-to roofer. Our dedicated service and production crews attend mandatory safety and installation training on a regular basis. This means your projects are OSHA compliant and completed by experienced, specialized experts every time.

Our Single Source Warranty means we take care of any issues directly. You call us and we take care of it! It’s that simple.


Why choose CentiMark as your Mod-Bit or BUR system contractor?

CentiMark has millions of square feet of installation experience with Modified Bitumen and Built-Up roof systems.



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