Foundation-to-Wall Air Sealing
We are in climate zone 2 and trying to finalize on the build details. Originally I thought to implement the idea of sandwiching acoutical sealant in between the concrete slab foundation and sill sealer and also between the sill sealer and bottom plate; I’ve also thought to maybe try the “monopoly framing” to have the sheathing continuously going up the wall to the roof.
My builder says this is overkill as any air leakage would be taken care of by the HVAC system. We will have open cell spray foam insulation and unvented attic space. Closed cell foam is out of the question. Is he right?
We are also considering adding exterior rigid foam insulation over the Zip sheathing (NOT planning on using the Zip panels that have insulation embedded in it which they call the Zip R). Which product and thickness should I go with? Or should we also skip this step also and use the money elsewhere in the build?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part