30 Apr '13, 4pm

Polyethylene sheet trapped between gypsum and wood panels, is that wrong? #green

I am currently restoring an old house in a cold climate. The ceilings on the second floor were previously covered with big fiberboard panels, which I removed because they looked wavy. Under it is a layer of old wood paneling (V-joints), that used to be the finished ceiling before, which are fixed to the attic studs. Directly on top of them, in the attic, is the current insulation (looking like cellulose). The wood paneling is too damaged to be kept visible but I don't want to remove it (mainly to avoid the mess) so I want to recover it with gypsum panels. Now the question is : would it be right if before fixing the gypsum I cover the wood paneling with a sheet of polyethylene to act as a air-vapor-barrier? I've never heard before situations where the polyethylene is trapped between two layers of "solid" before reaching the insulation, but for me it looks like it may do its...

Full article: http://www.greenbuildingadvisor.com/community/forum/gener...

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