Polymer Modified Bitumen Roofing Underlayment

Sometimes this term is shortened to mod bit the term bitumen is a generic name applied to various mixtures of hydrocarbons.

Polymer modified bitumen roofing underlayment.

Liberty sbs self adhering base ply sheet docs. A roof system is comprised of multiple components and roof underlayment is an important element of an effective roof system designed to protect both life and property. Any professional can measure and nail it all over the surface within a few hours. Asphalt is known for its durability long life expectancy excellent uplift and fire resistance.

With that in mind you need underlayment made of materials that can resist higher temperature without getting damaged. Based on their growing popularity there is an astm international standard written to address self adhesive membranes installed beneath exposed roofing materials astm d1970 standard specification for self adhering polymer modified bituminous sheet materials used as steep roofing underlayment for ice dam protection. A durable modified bitumen membrane designed for use as a waterproofing membrane and reinforced with a glass mat which is coated with a polymer modified asphalt. Liberty sbs self adhering base ply sheet videos.

You can choose from asphalt foam modified bitumen polymer or pvc because of their durability and heat resistance. 1 2 these underlayment sheets have a sticky adhesive layer which is exposed by removal of a protective sheet. However some manufacturers also specify an ambient temperature at the time of application. Exactly how long is difficult to predict.

1 1 this specification covers polymer modified bituminous sheet materials intended for use as underlayment on roof eaves or valleys or both to prevent leakage of shingle tile or metal roofs from water back up due to ice dams. For example morrilton ark based bitec inc s mat 40 product for use where roof temperatures can exceed 260 f such as under metal should be installed when the outside temperature is 55 f or higher. All self adhering polymer modified bitumen sheet products need to be applied to clean dry roof decks. One of these mixtures is the asphalt used in underlayment asphalt shingles and built up roofing.

Asphalt saturated felt rubberized asphalt including polymer modified bitumen. This barrier shall consist of at least two layers of underlayment cemented together or be a self adhering polymer modified bitumen sheet many times referred to as ice dam protection or ice and water shield. There are three basic types of underlayment used beneath roofing materials. Warranties for two layers of sbs modified asphalt underlayments range from 10 to 30 years.

The underlayment also has a slip proof polymer to the bottom. The terms modified bitumen is often used when referring to asphaltic roofing materails. Liberty sbs self adhering base ply sheet specs. Also the textured fabric lets steep sloppy walkability.

The underlayment roll is comfortable to sit on the roof floors and walls or anywhere you need it.