Sealing Air Gaps Over Suspended Ceiling

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Old 01-11-19, 12:44 PM
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Sealing Air Gaps Over Suspended Ceiling

I would like to know what to use to seal up any holes made in the original ceiling (over the drop ceiling).

This is a single story house with a hip roof. Put up in the 50's. Cold climate here. The attic has blown in insulation but there is warm air going up.

There are openings from cables, phone lines and some bigger holes from whatever. Looks like there had been some kind of a vent that left an opening. What could I use to cover that?

Any ideas would be helpful, thanks.
 
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Old 01-11-19, 01:13 PM
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Assuming you have a drywall or plaster ceiling above the drop ceiling, there should be no large openings that have not been drywalled then fire taped... smaller penetrations can be sealed with fire rated expanding foam. Drywall over large penetrations.
 
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Old 01-11-19, 01:31 PM
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Original ceiling is not plaster or drywall, it's tiles that are tight to the ceiling. This room had been a garage at one time and later fixed up some but they weren't too careful.

I can't get into the attic itself to seal any gaps so I have to do it from below as best I can.

Thanks.
 
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Old 01-11-19, 01:42 PM
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Tiles? Like the 12x12 ones that get stapled onto strapping? I would say do the best you can by making plywood patches over the tile, and use foam to fill gaps.
 
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Old 01-11-19, 01:45 PM
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Yes, I think that's the type. Old house.
Is silicone caulk the right kind to use in smaller openings?
 
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