Dallas/Fort Worth​



Houston (281) 302-6738

If you feel like your home may need a roof repair or roof replacement,  contact our trusted contractors at Keystone Contracting Group, Inc. for all your roofing needs; with over 35 years of experience in roofing and contracting, our team is your premiere choice for Houston and Dallas / Fort Worth roof Replacement, repairs and maintenance. 


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Types of Modified Bitumen

There are two classes of modified bitumen: elastomeric extenders (SBS) and thermoplastic extenders (APP). 

SBS membranes are more flexible in cold conditions compared to that of APP. Their production is more complex, as they rely upon the compatibility of bitumen with the elastomer. For the application to be a success, APP will require torch/open flame to install while SBS involves mopping the field with hot asphalt. 

Modified bitumen has the built-up roof's strength, which is braced with polymer modification. It has to meet rigid quality control criteria to attain overall system integrity and impact resistance. 


Another unique feature of modified bitumen is its long lifespan depending on the systems composition of interply's and base sheet. Compared with other roof materials that only serve 10 to 15 years, this system can have manufacturer warranties up to 20 years, without many issues and repair concerns. It only requires minimal upkeep and has a low rate for wear and tear because of its unmatched durability. It is also more ductile and flexible since it went through polymer modifications. 

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