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DIYSeeker
Plastic sheeting under fiberglass bats in kitchen ceiling
DIYSeeker

We recently purchased a Florida home that has a dropped ceiling (7') in the kitchen. The ceiling is wallboard on 2x4 framing hung below trusses spaced at 24”, with ugly vaults with fluorescent lighting inside. The rest of the house has wallboard installed directly onto the truss bottoms for an 8' ceiling. I want to remove the lowered kitchen ceiling and install wallboard onto the truss bottoms in the kitchen as well. There is fiberglass batting insulation, with vapor barrier down, above the kitchen. My problem is how to deal with the insulation when I open the ceiling & I don't want to leave the room open to the attic while doing the work. Should I first remove all the insulation above this area and place plastic sheeting in the attic area to minimize cooling loss, etc., then replace the insulation when new ceiling finished? Or, if I leave the insulation in place and install plastic sheeting to the underside of the trusses as I progress in opening up the area when I remove the dropped ceiling & framing, is it OK to leave this sheeting in place when I install wallboard for the new ceiling?

dj1
Re: Plastic sheeting under fiberglass bats in kitchen ceiling
dj1

Remove the insulation, because you will have to: 1. make electrical alterations, and 2. add joists to make it 16" o.c.

You can use a plastic sheet to minimize cooling loss while you're working.

When installing the insulation back (paper to the ceiling side), you won't need that plastic.

Hanging drywall onto the ceiling is a job for two. There are some creative ways to do it solo, but I prefer to have a helper/shlepper !

DIYSeeker
Re: Plastic sheeting under fiberglass bats in kitchen ceiling
DIYSeeker

Yeah, I guessed that would be the preferred approach, i.e., remove the insulation & replace after. But, the ceilings in the other areas of the house are drywall secured to the 24" OC trusses. Do I really have to add 2x4s to make a 16" OC grid? Also, would leaving the plastic sheeting in place cause a problem?

Mastercarpentry
Re: Plastic sheeting under fiberglass bats in kitchen ceiling
Mastercarpentry

I'm t sure if it's still 'code', but 5/8" sheetrock used to be permitted for ceilings 24" OC. 1/2" never was. Permissible or not, I'd prefer 16" OC through heavy strapping or by raising the original drop till it's tight. I have seen 5/8" 'bow' over time with 24" OC framing.

Phil

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