Polymer Modified Bitumen Roofing Underlayment

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.

Polymer modified bitumen roofing underlayment. Liberty sbs self adhering base ply sheet specs. The terms modified bitumen is often used when referring to asphaltic roofing materails. All self adhering polymer modified bitumen sheet products need to be applied to clean dry roof decks. Warranties for two layers of sbs modified asphalt underlayments range from 10 to 30 years.

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. 1 2 these underlayment sheets have a sticky adhesive layer which is exposed by removal of a protective sheet. You can choose from asphalt foam modified bitumen polymer or pvc because of their durability and heat resistance. The underlayment also has a slip proof polymer to the bottom.

Per square roofing jargon for 100 sq. Liberty sbs self adhering base ply sheet docs. One of these mixtures is the asphalt used in underlayment asphalt shingles and built up roofing. Just to be clear sbs 40 is not a brand but indicates an sbs modified underlayment that weighs 40 lbs.

Liberty sbs self adhering base ply sheet videos. Any professional can measure and nail it all over the surface within a few hours. 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. The underlayment roll is comfortable to sit on the roof floors and walls or anywhere you need it.

With that in mind you need underlayment made of materials that can resist higher temperature without getting damaged. Asphalt is known for its durability long life expectancy excellent uplift and fire resistance. 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. Asphalt saturated felt rubberized asphalt including polymer modified bitumen.

Exactly how long is difficult to predict. There are three basic types of underlayment used beneath roofing materials. 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. Also the textured fabric lets steep sloppy walkability.

A complete roof system is more than just the final roofing material.