I'm wondering if anyone out there has come across specific language for the attachment of fiberglass insulation over an unconditioned crawl space. I realize there are various ways to accomplish proper installation where the insulation material makes contact with the floor diaphragm. Personally I prefer to see the use of nylon twine as a means of attachment and I'm wondering if anyone happens to know of any recommended spacing guidelines for the attachment points of a zig zag pattern of twine when used for support of floor insulation.
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That all makes sense. Having spent the last 20 years building and remodeling homes and only the last 4 concentrating on building science and weatherization, I am still trying to figure out what many of you veterans have already learned. I thank you for the responses and your time.
See section 3.2 of the ENERGY STAR TERC guidelines
From the "Retrofit Workforce Guidelines" (which are still in critical care & unavailable at the moment - but from my review)
7.36 Accessible Floors (between conditioned & unconditioned space) – personally not the best choice down south, but that’s for another day
I assume you're aware of the latest Building Science rant from Dr. Joe in which he argues against the requirement that insulation be in contact with subfloor (I excerpt it here at http://homeenergypros.lbl.gov/forum/topics/another-irreverent-whine...), and will try to get this changed in the next IRC code revision.
But why do you say that Kraft facing is a problem? It meets the IRC guideline for a 1 perm vapor retarder.
Thanks Robert & yes I am but that doesn't apply to the here, now or the question posed.
As for the question about the kraft - no matter where you are at, if one is going to use such a product the last thing you want is water being trapped against it & the subfloor whether it is from moisture in the air, over active cleaners, plumbing leaks, or water splashed from tubs, showers, or sinks. Maybe you guys have less issues up north, but down here unfaced FG is bad enough & the kraft style seemingly just makes it worse