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Spray Foan on top of batt insulation? Post New Topic | Post Reply

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Phyllis Anderson
Posted: Dec 13, 2011 03:15 PM
Spray Foan on top of batt insulation?
We have a ceiling with batt insulation with a plastic backing that's becoming brittle - can spray foam be applied right on top of that to fill in the open area between the trusses? There is at least a 4 inch open area if the foam would adhere to the old surface and fill in between the boards.
Posted: Dec 15, 2011 08:34 PM
I wouldn't advise it. The foam will not be sealed to the ceiling as it should and will not do the job intended. You will get a much superior job by removing the old brittle material and spraying directly to the backside of the ceiling. Always cheaper to it right than do it over.
Eric Machemer
Posted: Dec 18, 2011 06:39 PM
I concur with Skip.

Pull out the pink fluffy stuff and spray foam directly on the ceiling.
Daniel X
Posted: Dec 19, 2011 12:18 AM
Bad idea.

Not a suitable substrate for a foam application.

I can't see a benefit of leaving the crap in there and putting all of that money over a questionable surface.

Clean, dry, well fastened, are some of the things you should be working towards for a good substrate.

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