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one houre rated ceiling assembly

  1. G

    converting existing ceiling with 2x6 ceiling joist to one hr rated ceiling assembly

    Hi all, I'm working on an ADU and came across a problem. there are existing 2x6 ceiling joists i and need to change them to a one hour fire rated ceiling assembly. Project is located in California. Some of the joists are 2x6 and some are 2x10, even though in the code it doesn't say the size of...
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