ASTM D1970/D1970M-25

Podrobné informace

Označení: ASTM D1970/D1970M-25

Datum vydání: 01.12.2025

Stran: 6

Země: Americká technická norma

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Anotace

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.


Keywords:
ice dam protections, polymer-modifieds, self-adherings, steep roofings, underlayments,, ICS Number Code 91.100.60 (Thermal and sound insulating materials)