ASTM D 1970—09 Specification for Self-adhering Polymer Modified Bituminous Sheet Materials Used as Steep Roof Underlayment for Ice Dam Protection (PDF Download)

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This specification covers the standards for polymer modified bituminous sheet materials proposed 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 sheet shall comply with the physical requirements which include thickness, maximum load, elongation, adhesion to plywood, thermal stability, flexibility, tear resistance, moisture vapor permeance, sealability, and slip resistance. The underlayment sheet shall not crack, as well, nor be too sticky as to cause damage upon being unrolled.

This standard is referenced in the 2012 International Building Code® and the International Residential Code®.

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