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Drywall above stud wall framing good for fireblock?

krackling | Posted in Building Code Questions on

First off, the website has been a wealth of information and a great help so thank you. I’m in the process of finishing my basement and have put 2″ XPS in the rim joist section and plan to follow-up with 1″ XPS on the interior walls followed by the framing in-front of that. For a fireblock, is 1/2″ drywall safe in the basement to attach to the joists and then butting the top of the XPS against along with the top plate of the stud wall? I assume this would be an acceptable fireblock but not sure if the drywall would be a safe bet. I’m already halfway through installing the drywall for this but haven’t yet put the foam or framing in and having second thoughts.

Picture is worth a thousand words… see below

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  1. GBA Editor
    Martin Holladay | | #1

    As far as I know, the 1/2-inch drywall will work -- but it never hurts to contact your local code enforcement official to find out whether local interpretations differ from my advice.

    The image below shows a standard fire blocking detail.


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