I need recommendations for the best way to insulate and air seal the walls and floors in in house built in 1977 in the Seattle area.
Existing walls – 2×4 @ 16″ o.c.
Sheathing – 1×8 boards
Siding – 1×8 lap siding to be removed
Existing subfloor – 2×6 T&G
Floor structure – 4×10 beams 4′ o.oc.
Min req’d R-value for the walls is R-21
Min req’d R-value for floors is R-30