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What I take concern with is blind acceptance of prescriptive requirements as some type of sacred minimum. In the case of indirectly conditioned attics, the additional Value for getting to R38 employing spray foam will probable be additional successful if used on other effectiveness enhancements.
Your description of the distinction between the prescriptive and overall performance code won't vary in any considerable way from my description (aside from the fact that a code Formal from Carrboro told me more than the phone which the local code in Carrboro has a bare minimum prescriptive ceiling R-benefit need of R-38, not R-thirty -- this might vary determined by diverse places in North Carolina as a result of local climate map).
I hardly ever lower price a research paper just because it is aged. Info are generally applicable, And that i am an avid consumer of investigation papers.
BTW, I do acquire challenge Together with the notion that R20 is by some means optimal for all cases and CZ's. I wasn't mindful Icynene alone at any time reported that.
I'm not obsessesd with evaluating the worst executing insulations to a different when you mentioned. I'm trying to be aware of your considered system in the putting up. Could you remember to supply answers to my inquiries.
Whetstone: "Perfectly, I moved the insulation up to your rafters. In order that necessity isn't going to use to persons like me."
Ed Reeves, Icynene’s engineering supervisor, instructed me which the letter boasting that R-twenty Icynene performs in addition to R-38 fiberglass insulation was getting used by builders pursuing the prescriptive path. As soon as my website was printed, Icynene backed far from that visit here placement, saying which the controversial letter was supposed only for those adhering to the general performance path.
I've persistently encouraged builders to settle on constructing devices that emphasize air tightness. Anybody who asks my assistance for insulating an unconditioned attic gets exactly the same guidance:
You stated: "Most foam producers are struggling to go the ASTM E84 exam at foam thicknesses larger than four inches."
The problem of greatest thickness restrictions for spray foam is challenging and sometimes ignored by code officials. I wrote an write-up over the question for your April 2008 difficulty of Electrical power Design and style Update
Martin, I have read through his response lots of of your articles and concur with Substantially of what you generate. On this make a difference you're dead Mistaken. I'm not an advocate of any foam mfg, I and an exceptionally substantial proponent of not misleading men and women as you've got accomplished Within this particular article.
I disagree Using the foolish techniques of Icynene but realize that they are trying to make a big position In relation to boosting r-worth codes to compensate for warmth reduction/gain.
Almost Everybody putting up In this particular thread appears to be expressing that Strength codes *involve* R38 (or no matter what) about the roof deck of the encapsulated attic.The last time I seemed, there's no prescriptive R-value for encapsulated attics (admittedly, I have never found 2009 tables yet). Naturally, it is not shocking that making inspectors seek advice from the ceiling insulation requirement in the case of an encapsulated attic.
Martin, in one within your responses back to Scott you asked him to offer one particular instance of misinformation. I have confidence in my final response I furnished at the very least 1 and I think many a lot more offered the logic behind your report.