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Reply to "Best way to insulate 100 year old unfinished attic ceiling?"
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[quote=Anonymous][quote=Anonymous][quote=Anonymous]The only place to point that foam gun is away from my house. https://www.theguardian.com/money/article/2024/aug/12/they-encouraged-us-to-insulate-our-home-now-its-unmortgageable [/quote] That article is about open-cell foam, which is permeable and needs to be vented. There is some contention in the building science community that a thick enough layer of open-cell foam becomes impermeable, but there's not much agreement as to how thick is "thick enough." There have been failures in the US of open-cell foam applied directly to the underside of roofs as well, it's a risky approach. Closed-cell is fine. [/quote] Article on the risks of open-cell foam: https://www.greenbuildingadvisor.com/article/open-cell-spray-foam-and-damp-roof-sheathing "If you want to lower the risk of damp OSB, choose closed-cell spray foam, not open-cell spray foam, to insulate the underside of the roof sheathing." [/quote]
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