I am opening a NE facing brick veneer over 2x4 wall in southeast Virginia to accept a larger series of windows. I plan to do the following on the interior:
Insulate the bays in the 2x4 wall with faced R13 Cover wall with 1/2 7 layer cabinet grade plywood( gotta good deal ) screwed every 6 inches or so for rack resistance ( paranoia ) layer 1/2 inch of rigid foam, tape seams
1/2 drywall over that.
Questions: It looks like I will have 2 vapor barriors, will the plywood rot? Should I even worry about the foam? It will only add R3 over the studs Can I screw through the 1/2 inch drywall through the foam into the plywood substrate with no worries about moving seams later.
Any other reccomendations?