Re: Vapor barrier or not?
Here's an opinion, for what it's worth, and I certainly could be wrong, but it's my line of thinking.. I do alot of remodeling and construction. My understanding of why condensation happens to begin with is that the air on one side of the window/wall/pannel/whatever is cooler than the air on the other side. the aluminum pannel, lets say, might have a surface temp of, say sixty degrees if its cool outside, while it might be eighty in the kitchen. (or vice versa, mabey the sun warms the exterior while your a.c. keeps the kitchen cooler) at any rate, with NO insulation, condensation will form rapidly and abundantly. the better your r value, the less this will happen. The insulation here is doing two jobs. First, its keeping the kitchen (or house ect.) at a comfortable temp. But also, it's keeping the interior kitchen air temature from reaching the aluminum pannel. So... although it may be forty degrees OUTSIDE and seventy INSIDE.... as long as your insulation is doing its job, (keeping the inside air temp away from the pannel) the condensation simply wont form to begin with. Keep in mind, a vapor barrior doesnt STOP condensation from forming, it just keeps it from soaking through something. If it forms in the wall, its gotta go somewhere. All that being said, and I apologize for the long ass post, vapor barrior always goes to the inside of the room. Perhaps considder the color of the exterior, lighter reflects heat away. Mabey vent the walls at the bottom, underneath. Use high grade insulation, mabey even spray foam. the better the insulation job the less condensation to begin with. And last, although this ones a stretch... try to keep the kitchen temp as close to the outside as possible. (of course thats not feasable in freezing weather :) ) Any way, good luck, and thats just what my brain was thinking, so mabey theres an idea in there some where that might be helpfull.