Polymer Modified Bitumen Roofing Underlayment

Liberty sbs self adhering base ply sheet docs.

Polymer modified bitumen roofing underlayment.

Asphalt saturated felt rubberized asphalt including polymer modified bitumen. 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. Asphalt is known for its durability long life expectancy excellent uplift and fire resistance. The terms modified bitumen is often used when referring to asphaltic roofing materails.

1 2 these underlayment sheets have a sticky adhesive layer which is exposed by removal of a protective sheet. Liberty sbs self adhering base ply sheet videos. Exactly how long is difficult to predict. Warranties for two layers of sbs modified asphalt underlayments range from 10 to 30 years.

One of these mixtures is the asphalt used in underlayment asphalt shingles and built up roofing. Per square roofing jargon for 100 sq. There are three basic types of underlayment used beneath roofing materials. The underlayment also has a slip proof polymer to the bottom.

A complete roof system is more than just the final roofing material. However some manufacturers also specify an ambient temperature at the time of application. 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. Liberty sbs self adhering base ply sheet specs.

The underlayment roll is comfortable to sit on the roof floors and walls or anywhere you need it. 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. 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. With that in mind you need underlayment made of materials that can resist higher temperature without getting damaged.

Just to be clear sbs 40 is not a brand but indicates an sbs modified underlayment that weighs 40 lbs. Any professional can measure and nail it all over the surface within a few hours. You can choose from asphalt foam modified bitumen polymer or pvc because of their durability and heat resistance. 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.

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