I have removed two layers of 12" square ceiling tile and strapping to reveal original "wall board" ceiling. My plan is to re-strap over the original, and install 1/2" gyproc. ( "green board" )
Question: should I install vapor barrier over the extant ceiling before the strapping, or between the strapping and new gyproc?
The existing ceiling cannot be removed, as the attic above has loose insulation consistent with building practices of the '50's. To further complicate things, the water supply ( 1/2" streamline copper ) for toilet and vanity are now exposed and a "chase" will have to be created between the layers. I am concerned about condensation within the pipe chase, especially on the cold water supply.
Any opinion would be greatly appreciated.
If you have a vapour barrier in your attic ( you should ), don't put another one on, it will just trap moisture between the two. If you don't then install the strapping, vapour barrier then the drywall. Seal the vapour barrier to the walls using tuck tape. The water pipes shouldn't be a problem, because they are on the warm side. If you are concerned about it, wrap the pipes with foam pipe insulation.
I would wrap pipes with foam pipe wrap, strap ceiling to cater for the lower height due to the insulated pipe and then board with appropriate material for room.
As for a vapour barrier, multiple layers of paint such as 2 coats of oil paint is a vapour barrier, or you can get latex vapour barrier paints now.
You have many options. The comment before is valid also.
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