Vapor Plain
Posted by admin on January 31, 2011
Insulation vapor barriers?
A friend is insulating the attic for heat loss in her cabin in northern Michigan. Above the living space ceiling is some blown insulation covered by wood on the top of the truss base (to allow for attic storage). A contractor is rolling R25 plain insulation over the top of this wood planking. Is this wise and/or okay?
Seems a bit daft to me because doing it in this manner will prevent you from now storing things in the attic. Technically as long as the vapor barrier is facing the side that is heated it should be ok, but unless the old insulation also has a vapor barrier you could see condensation trapped and sogging down the old insulation. Sounds like this is about the laziest way to do it. Of course, to replace the old insulation, which may be packed down and full of mouse droppings, you’d have to take up the planking and maybe even elevate to accomodate extra thickness of the new insulation, and that’s a lot more time and effort and money.
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