January 25, 2012

Modified Bitumen APP

The use of modified bitumen APP is very well loved with many contractors in Southern California, mainly because of its ease of installation and its adaptability.  Modified bitumen APP is considerably more sip resistant than similar types of roofing materials, as well as having added rigidity and superior resistance to wear.

The main downside to modified bitumen APP is its lack of flexibility in cold weather conditions.  This might not be an issue in some parts of Southern California, but it is an issue that needs to be addressed before committing to the use of modified bitumen APP.

A further downside to modified bitumen APP is its required use of open flame torch down installation.  There are dangers connected with the use of open flame propane torches for torch down roofs, and building owners should discuss these dangers with their contractors before work starts.

There are other options when installing modified bitumen APP, because there are now some manufacturers that are starting to adopt less perilous adhesives for installation.  These new adhesive options are becoming more well loved because of advances in adhesive technologies.

Modified bitumen APP is specially designed sheet material that uses a combination of glass fibers and polyester fibers as reinforcement; it is then covered with atactic polypropylene, or APP.  Atactic polypropylene is a very soft and chewy amorphous polymer that is very common in many different types of torch down roofing materials.

Though many modified bitumen APP roofing materials are considered U.V. resistant, it is highly recommend by many manufacturers that these roofs get added treatment for U.V. safeguard to prevent premature weathering.

Once installed, most modified bitumen APP offer some of the best long-term fire resistance of any other type of roofing material, mainly because of the integrated glass fibers used in the manufacturing.