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Old 12-16-2010, 04:57 PM   #1
Join Date: May 2008
Location: Near Philly
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How to finish closet ceiling in garage space

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Due to a frozen pipe, I was in my mom's garage's attic (abuts her house, shares a common wall). In drawing (just learning google sketch), there is an inside closet that intrudes into the garage. Thick black line is garage ceiling plane. That closet has a heating duct running in it; the ceiling of the closet is drywalled beneath the duct space. In the garage ceiling, the space above the duct space was only "sealed" with faced insulation. I think it should be for fire protection (no way to stop fire from entering duct space from attic space) and to reduce air infiltration (This is what caused frozen pipe: there were 6 of the 2nd floor joist bays open to the garage attic space, one of which had the pipes in them).

So, my question: What should I install from the garage attic space between the joists that lie above this duct chase? I can't install from below unless I rip out the closet ceiling but then I'd have the duct work to contend with.

One limitation: I've about a 2' x 2' ceiling hole to access the garage attic.

Should I cut drywall to fit between the joists (whole space to cover is 36" x 62")? I'm a bit concerned about drywall sagging since I can't install it to the bottom edge of the joists; I thought about running a 1 x 3" flat alongside joists to support drywall edges. Agree?

When done, I'll spray foam gaps where drywall hits joists with fireblock foam and then insulate with fiberglass batts.

Any thoughts?

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Old 12-17-2010, 05:30 AM   #2
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How to finish closet ceiling in garage space

My main question: Do I need to have fire-rated covering over this space and if so, what would be best to use? If drywall, what kind/thickness; if I could use plywood or OSB, same question, type/thickness?

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Old 12-18-2010, 02:10 AM   #3
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How to finish closet ceiling in garage space

5/8" drywall twice....yep 2 layers meets fire code.
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