Another big place air leaks through your insulation is behind your factory firebox and any tub units on the outside wall. If you catch it while you're building, you can nip these problems in the bud. Before you install the firebox or the tub, insulate the wall. Then seal the insulation up with a layer of 1/8" thermoply. Then install the unit. I'm sure someone's going to say "but the insulator comes after these things are installed." That is something you just have to work out with your subs. I compensated by having a roll on hand during framing for my framers to stuff in my house corners at framing. I did the fireplace and tub unit myself to keep things on track. If you're using a builder who has built green before, they will have already worked these little things out ahead of time. Remember that after the drywall goes up it will be too late to address these areas at all!
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