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Old 01-01-2017, 08:07 AM   #1
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Adding polyiso to knee wall


I am getting ready to finish out a bonus room above my garage. Once the rough electrical has been inspected i will start the insulation process. I live in zone 3. when insulating the knee walls, i want to use foil face polyiso (1" thermax) on the back of the knee wall. Does the foil face toward the attic or toward the conditioned space? I will be using kraft faced fiberglass batts. Didnt know if i would be putting the fiberglass between 2 vapor barriers or not. I fully intent to reaaly seal it up as well to prevent air leakage.

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Old 01-01-2017, 08:51 PM   #2
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Re: Adding polyiso to knee wall


Never mind....bought some 1" polyiso today and didnt realize it was foil face on both sides!

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Old 01-02-2017, 05:46 AM   #3
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Re: Adding polyiso to knee wall


Just a note, but it is possible the foil on the two sides are not equal. Thermax has been tested to be left exposed with no additional thermal barrier but most likely only one side achieves that rating. Dow's web site or the label on the insulation should tell you which side to leave exposed. It isn't easy to find near me so I haven't personally used it.

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Old 01-02-2017, 10:26 PM   #4
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Re: Adding polyiso to knee wall


----------------------Welcome to the forums!-----------------------

Are you in a mixed-humid climate of Zone 3?; https://basc.pnnl.gov/sites/default/...mid_121914.pdf Regardless, tape all foam board seams, after installing it on caulking beads, caulk the drywall to studs/plates joints, and canned foam any wiring/plumbing holes. Where is the house? State...

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