Building Science-A Benefit of Exterior Insulation

I’m a big fan of exterior insulation.  It’s rarely used in my area, mostly because the State of Minnesota has eliminated that code requirement.  It has to to with our wide use of polyethylene sheeting as a vapor retarder on the warm in winter side of a wall assembly and then adding a low permeance plastic insulation product as exterior insulation.  These plastic foams would be the choice for most contractors, lower cost and easy to source.  Very slow vapor movement in either direction when a wall assembly becomes wet.  This posting isn’t going to get into the foam insulations, but more into what exterior insulation can do for a home. Continue reading “Building Science-A Benefit of Exterior Insulation”