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Polyiso foam board

Sparky2968| Posted inGeneral Questionson

Hi, I recently obtained 3”x4x8 sheets of kraft faced polyiso foam board that was left over on a job site. I’m planning on insulating my crawl space walls and rim joists with foam board. My question is, will I have any issues if I use the faced polyiso on the rim joists.

thanks for any input

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  1. Expert Member
    Zephyr7||#1

    What is on the exterior of your rim joist and what climate zone are you in?

    Bill

  2. Sparky2968||#2

    I have vinyl siding installed over 1/4” fan fold. I believe I’m in zone 6, western WV

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