Thursday, August 19, 2010

I have exterior face brick over a 2x4 frame wall. When insulating, should the vapor barrier face in or out?

Currently the kraft paper vapor barrier on the fiberglass insulation is facing to the outside.This seems backwards. I thought the vapor barrier is always to the living space, but I am not familiar with procedure when the face brick exterior is considered.

I have exterior face brick over a 2x4 frame wall. When insulating, should the vapor barrier face in or out?
The kraft paper should be to the inside of the living space.
Reply:The vapor barrier faces into the living area. EXCEPT in only one situation: Below grade. The vapor barrier goes between the masonry and the insulation or moisture will build up and smell moldy.
Reply:Vapor barrier should always face the living area.
Reply:It does not make a difference with the brick or siding, the Vapor barrier faces inside, the purpose is to keep moisture from going out through the wall- in the old days of wood siding and paint, that moisture would cause paint to blister and peel.


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