A few part question, trying to get the details ironed out before I get to the insulation part of my remodel. Its a 1900’s house in climate zone 6, the siding is in decent shape and original so I don’t want to remove it, there for im insulating the inside. And i have no weather barrier or resin paper between sheathing and siding.
My idea so far is ridged foam spaced half inch off from my sheathing fill the rest with Rockwool insulation( vent the half inch space to the un conditioned attic and through the sill plate). Then 6mil poly for a air barrier over that continuing over the ceiling and down the wall and over the sub floor. And on top of that run 2×4 studs 24 on center horizontally so my outlets switches and what ever wont be air leaks plus i can put fiberglass insulation in to increase the r value a little more. Then cover with dry wall.
Will i gain anything by sealing the ridged foam with some foam like poormans spray foam?
Should i use something like CertainTee’s MemBrain instead of the poly?( we don’t use A/C in the summer, we just open windows and turn a fan on)
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