Sep 11, 2009 · The more rigorous standard, ASTM D 226, requires a minimum weight of 11.5 pounds per square. Most lumberyards stock only light-weight asphalt felt with no ASTM rating. “We sell a lot of the lightweight felts, the non-ASTM #15,” says Webster. “It is probably our biggest seller.” This type of #15 felt sometimes weighs only 7.6 pounds per ...

Apr 26, 2019 · I'm open to using another type of WRB but was steered toward using the #30 Felt as the Cedar Shake and Shingle Bureau recommends it their Exterior and Interior Wall Manual that states "underlayment shall be No. 30 felt conforming to ASTM D226 Type II …

Jan 2, 2011 · But, if I used sheathing (preferably sawn lumber boards for breatheability and durabiity), then I always prefer #15 felt, and preferably ASTM D226 #15 felt (11.5 – 12.5 lbs per square). Most building supply houses seem to stock ASTM D4869 #15 felt (8.0 – 9.7 lbs per square), while unrated #15 felt might be only 7.6 – 8.8 lbs per square.

Apr 14, 2010 · The WRB should be on the weather side, directly behind the cladding, and it should be #15 felt so it won't be degraded by the surfactants in the cedar, ASTM D226 felt if you can find it rather than the more common (and thinner) ASTM D4869.

ASTM D4869 #15 felt can be 8.0 – 9.7 lbs/square. And ASTM D226 #15 felt must be 11.5 – 12.5 lbs/square (which is the code standard for WRBs). Asphalt-saturated rag felt has proven itself effective as a weather barrier since 1844.

Nov 12, 2010 · I live in Northern California - 5 months of heating season - wet cold weather, no snow, rarely go below freezing. Dry summer and I don't plan to have AC. I am planning on building a new house (around 3000 sf) with the following wall assembly. I am looking for advice on wall assembly with the following requirements: A) healthy (not off gas and minimize toxic …

Nov 8, 2024 · A similar test standard is ASTM E1233, which uses the same testing parameters, but includes cyclic or varying pressure differentials to simulate wind gusts instead of constant wind pressures. The most impressive test I observed was the ASTM E1886, which entails shooting a 2×4 out of a cannon so it impacts the center of the window or door glass ...

Dec 12, 2023 · Patrick, The PHIUS 2021 guidebook has two airtightness requirements for single family construction. 0.06 CFM50/sf of envelope area is the requirement for the performance path (ie full WUFI modeling) where the prescriptive path (no WUFI modeling needed) requires a tighter envelope metric of 0.04 CFM50/sf as Kiley noted above.

ASTM qualifies roofing felts with the following ratings: ASTM D4869 (Type 1 with a minimum weight of 8 pounds per 100 square feet) and ASTM D226 (Type 2 with a minimum weight of 11.5 pounds per 100 square feet). “#15” felt used to weigh 15 pounds per 100 square feet, but not anymore; non-ASTM felts can weigh as little as 7 pounds per 100 ...

Apr 21, 2016 · Does anyone has a reliable chart or table for brick lintel length on each side of a brick wall opening? I've contacted brick suppliers and contractors, and apparently is all done by the way is always been done, and I hear 20 different answers.