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Posted on Insulating detached garage shop

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439 posts in 1457 days

#1 posted 07-16-2019 03:12 PM

I couldn’t see your pictures so I probably shouldn’t comment, but here is one idea you may want to adapt to your situation. Foam is nice but some prefer to avoid chemical formulas even if they are solidly approved. For smaller jobs fiber insulation (fiberglass, roxsol, etc.) can be easier and cheaper.

Your option #3 is probably the best of both worlds (high ceiling, low ceiling). Heres a quick sketch of how I do a ceiling like that. Condensation will reduce the efficiency of your insulation, air movement is important. Don’t forget to include a vapor barrier between your insulation and interior wall finish.

Edit: There is an additional benefit to this method. You probably don’t have problems with roof loads such as snow, but if you did or experience volatile weather, the triangulation of the roof rafters will greatly strengthen your roof assembly.

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