1.1 This specification covers vapor retarders for thermal insulation, specifically, flexible materials with permeance of 0.10 perm or lower and surface burning characteristics of 25 flame spread/50 smoke or lower. These materials are intended for use at surface temperatures of 20 to 150°F (29 to 66°C). It does not cover mastics or barrier coatings applied in liquid form, nor materials intended for use as weather barriers.
1.2 This specification provides physical requirements for vapor retarders. Practice C 755 provides assistance in solving problems related to moisture vapor transmission through thermal insulation materials.
1.3 The values stated in inch-pound units are to be regarded as standard. The SI units given in parentheses are for information only.
| SDO | ASTM: ASTM International |
| Document Number | C1136 |
| Publication Date | May 1, 2006 |
| Language | en - English |
| Page Count | 4 |
| Revision Level | 06 |
| Supercedes | |
| Committee | C16.33 |