Polymer Modified Bitumen Roofing Underlayment

Wide strip of self adhering polymer modified bitumen tape applied directly to the sheathing or decking.

Polymer modified bitumen roofing underlayment.

The terms modified bitumen is often used when referring to asphaltic roofing materails. Roof underlayment requirements recommendations. Tarco launched a comprehensive line of leakbarrier branded premium self adhering. 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.

Is roofing felt needed under asphalt shingle roofs. Sometimes this term is shortened to mod bit the term bitumen is a generic name applied to various mixtures of hydrocarbons. Initially modified bitumen membranes were intended for commercial roofing systems but by the turn of the century premium underlayment products made from modified bitumen were offered to residential roofing contractors. 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.

One of these mixtures is the asphalt used in underlayment asphalt shingles and built up roofing. A all joints in roof sheathing or decking shall be covered with a minimum 4 in.