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Discussion Starter · #1 · (Edited)
What's the accepted practice for drywalling around a plumbing penetration, when the drywall is meant to have a fire resistant effect?

In this case it's a 1940's boiler room partially covered in sheetrock, but later compromised to run new copper freshwater (not steam) pipes.

I'm thinking of cutting a U-Shaped patch and slipping it over the pipe, filling the U-shaped gap with another piece, then fire caulk. In the boiler room it does not have to be pretty. Sticky fiberglass tape and mud would complete the job.
 

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They make fire resistant spray foam, that would probably be your fastest and easiest.
 

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After the foam sets trim it down and put a plastic escutcheon on it
 

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Discussion Starter · #4 ·
OP here:
I ended up patching drywall in, then using foam (using a foam gun, not those ridiculous cans that clog after 2 hours). There's no way to test it of course :).
 
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