How To Install Roxul In Crawlspace - Insulation - DIY Chatroom Home Improvement Forum

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Old 05-09-2013, 11:48 AM   #1
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How to install Roxul in crawlspace

I would like to install Roxul(stone wool) insulation under subfloor. I am located in NY, Long Island. Roxul will be installed in a vented crawlspace. Since Roxul is not kraft-paper-faced like fiberglass, do I have to install vapor barrier between batts and subfloor? If I do, then what kind: plastic(mil?), tar paper else? Thanks!


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Old 05-09-2013, 03:55 PM   #2
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How to install Roxul in crawlspace

Welcome to the Forum!

a simple call to your building official will answer that question, after all they are familiar with your local code requirements.



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Old 05-11-2013, 10:06 PM   #3
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How to install Roxul in crawlspace

True, good advice! See if they accept the sub-floor sheathing as a vapor retarder and if able to cover it with a housewrap to stop air from wind-washing and degrading the R-value.

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insulation , roxul , subfloor under framing , vented crawlspace

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