I am in Winnipeg, and am wondering if it is still acceptable to install 5/8" Type X drywall into a joist cavity and seal it with fire caulking, instead of purchasing metal boxes?
I am trying to save money and drywalling is part of my trade and I have access to limitless amounts.
This is in my basement, I shouldn't need a vapor barrier for that. And I was thinking on just the 3 1/2" pots with drywall boxes surrounding them. Which would be from joist to joist, and equal size all around... So, 10 1/2" x 10 1/2" x 7 1/2" (joists are 2x8).
I heard I would have to have an air space above the box with no insul.
Is this correct?
You didn't mention your basement. You only require IC type boxes (IC = Insulated Ceiling) around insulation, non-IC or open frame are used around joists and no need for fire barrier.
Post a pic of what you are asking to put in as your question is not really clear.
I don't have a picture to show, because it is only open, unfinished ceiling in my basement.
What I am trying to get across is that I am going to be installing pot lights into my joist cavities in my basement. I would like to insulate within the cavities so, unless I purchase non-IC pot lights, I would need a fire box. I want to know if I am allowed to use 5/8" Type X drywall instead of a metal fire box that can be purchased at any big box hardware store. My joists are spaced 12" apart and are made from 2x8 lumber. I would like to cut the drywall to fit within my joists and create a sealed box around each pot light. I would use fire caulking and metal tape. The dimensions of the box would be about 10 1/2" x 10 1/2" x 7 1/2".
Is this still acceptable to do? Or do I have to purchase the actual boxes or enclosures to hold the pot lights? I am talking about code and not personal preference. I have tried to contact electricians and the Permit/ Inspections department in my city, but no one can give me an answer.
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