Posted by jackinok on February 07, 2011 at 11:02:26 from (162.58.82.136):
In Reply to: Work Shop posted by Danny Prosser on February 07, 2011 at 10:20:26:
generally you want your vapor barrier to the heated(or conditioned) side,normally the inside,of your building.Though many folks use house wrap on the outside under siding or brick, most of these products are breathable to allow moisture to evaporate.A barrier is just that,if you put a barrier over the metal outside, condensation will just build up on inside of it .This in turn will soak into your insulation,and you will have mold and rotting problems in your walls and ceiling over time since moisture cant escape.if you DO put something against tin , make sure its breathable to allow condensation to wick away.We used to use tar paper or roofing felt,contrary to most beliefs it is breathable .Vapor barrier is strictly to protect the INSULATION from moisture,since moisture causes it to lose its insulating values.As youve found out condensation will form on the warmer surface, if it cant get out ,your in reality better off with no vapor barrier at all.simple way to tell if you need vapor barrier, and where, is to watch where moisture forms ,if it forms inside ,moisture is coming from inside and thats where you need a barrier.if its forming outside,and some places it will,you need it outside.oddly you will find little about vapor barriers in most building codes (that ive seen anyway).tendancy is to not use any if not required so ive heard.and this may be your best bet .give the inside walls 3-4 coats of oil based paint and it will serve. .1/4"osb might not be thick enough for the ceiling,it will tend to bow and sag on you over time i would think just from its own weight.
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