...one other issue when you think about insulation....if you spray foam a 1/4" in the outside of the cavity and use isocynate board to cover the cavity before you add the plastic wrapped pink stuff you can make an -airtight- leak proof cavity/moisture resistant- and repairable with a spray can- with a very good insulation value very inexpensively-for those of you that are like me easy-cheap-and good R-value and very functionable....geofkaye [ pls. capitalize the word _CHEAP_!]
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