Modified Bitumen Roof Installation

Modified bitumen has been used for decades and is one of the most cost-effective methods for protecting your property and belongings. It is essentially a type of asphalt that is used to create a waterproof barrier, sealing your building from the elements. The reason it's not simply called asphalt is in the name. Modified bitumen has different modifiers added to the asphalt in an effort to give it different properties. Traditionally, the two most common additives are SBS (styrene butadiene styrene) and APP (attactic polypropylene). Each of these additives has unique attributes that give the asphalt different properties.

• SBS- Styrene butadiene styrene is a type of rubber that is added to the asphalt in an effort to make it more flexible and elastic. This makes it great for areas that tend to freeze a lot. The constant contraction and expansion can be tough on rigid roofs. This is by far the more common of the two modifiers.
• APP- Atactic polypropylene is a type of plastic that is added to the asphalt. It typically makes the membrane last longer. Although not as common as SBS, this is a great alternative for those wishing to extend the life of their roof.