To Vent or Not to Vent?
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That is the Question.
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By Roger V. Morrison, PF, RRC, Deer Ridge Consulting, Inc.
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The spray polyurethane foam (SPF) community has been installing unvented-conditioned attic in homes for decades.  But with the changes in the International Residential Code, which were first implemented in the 2004 Supplement, the code now recognized the practice, [...]

Q:How do non-vented attics work, and how is SPF properly used and applied in them?
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A: To better understand why spray polurethane foam (SPF) is a viable solution for non-vented attic insulation in both hot and cold conditions, let’s take a look back at the origins and science behind the traditional vented attic.  Attics are vented [...]