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Old 10-25-2009, 09:50 PM   #112
geofkaye
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Join Date: Apr 2006
Posts: 625
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insulation....if you are using foam board-get the stuff with the foil on it for about the same price as the pink foam board [dow] or the blue foam board [dow] but not the white foam board called "bead board"-it has half the insulating value of the polyisocynate board and will begin to squeak when is loosens up in the cavity as one drives down the road....it also holds water...which iso board will not. Foil is not something that I understand very well-so i go along with the manufactures guide..... only i apply a 4 inch vinyl tape to the seams and any openings in the sheet face to control any moisture should it be present....with spray foam it is unnecessary to have a moisture barrier as 2 lb. density spray foam will not allow any moisture to penetrate the foam......keeps moisture in and controls any leaks in the outside skin of the truck box...geofkaye and the Rivercity Girlz
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