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Type 1 - #8. Formerly ASTM D4869-93 Type I; Type 2 - #13. Formerly ASTM D226-97a Type I (No. 15) Type 3 - #20. Formerly ASTM D4869-93 Type II; Type 4 - #26. Formerly ASTM D226-97a Type II (No. 30) ASTM D2178 / D2178M-15a Standard — Specification for Asphalt Glass Felt Used in Roofing and Waterproofing. [9] Type IV has a 44-pound breaking strength
Underlay is also the term for the material under roofing tiles; [1] this roofing membrane is often made of rubber and is used to seal the roof and prevent leakage. Underlayment used with roofing shingles provides a second layer of water proofing to prevent leaks and is called tar paper , roofing felt , or since the 1990s synthetic underlayment.
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[3]: 136–137 Because patients' soft-tissue undercuts may be shallow or deep, impression materials vary in their rigidity in order to obtain an accurate impression. Rigid materials are used with patients with shallow undercuts, while elastic materials are used with patients with deep undercuts, as the material must be flexible enough to reach ...