ASTM D1970

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 abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

1. Scope

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.

1.2 These underlayment sheets have a sticky adhesive layer which is exposed by removal of a protective sheet. The top surface is suitable to work on during the application of the exposed roofing.

1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard.

1.4 The following safety hazards caveat pertains to the test methods portion, Section 8, of this standard. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents

ASTM Standards
D1079 Terminology Relating to Roofing and Waterproofing
D1204 Test Method for Linear Dimensional Changes of Nonrigid Thermoplastic Sheeting or Film at Elevated Temperature
D228 Test Methods for Sampling, Testing, and Analysis of Asphalt Roll Roofing, Cap Sheets, and Shingles Used in Roofing and Waterproofing
D2523 Practice for Testing Load-Strain Properties of Roofing Membranes
D4073 Test Method for Tensile-Tear Strength of Bituminous Roofing Membranes
D5147 Test Methods for Sampling and Testing Modified Bituminous Sheet Material
D903 Test Method for Peel or Stripping Strength of Adhesive Bonds
E96/E96M Test Methods for Water Vapor Transmission of Materials

Index Terms

ice dam protection; polymer-modified; self-adhering; steep roofing; underlayment
; Adhesion--roofing materials; Bituminous roofing materials--specifications; Elongation; Head of water test; Ice dam protection; Loading tests--roofing materials; Low-temperature flexibility; Polymers--specifications; Roofing materials/applications--specifications; Self-sealability; Thermal analysis (TA); Thermal stability; Underlayment products/applications--specifications; Water absorption--building materials; Waterproofing materials/applications ; ICS Number Code 91.100.60 (Thermal and sound insulating materials)

Citing ASTM Standards

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