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Can I slide foam board between the roof rafter and finished lath?

April 26, 2017finished foam lath rafter roof slide

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Can I slide foam board between the roof rafter and finished lath?

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David writes again from Arlington, Massachusetts: “Can I slide your foam board insulation between the roof rafter (16 inch on center – true 2×8) and the finished lath sloping ceiling? Or do you sell some other product that would work?” Answer: We do not recommend FOAMULAR® insulation for this application. Instead, consider using PINK fiberglass insulation. Detailed installation instructions can be found at owenscorning.com on the project page for cathedral ceilings.