Well essentially outlets and switch boxes are holes in your wall. inevitably a blower door test will reveal that there is leakage through the outlets. These can be sealed with foam or caulk. What I wanted to get at was this cool product that eliminates this problem. The Airfoil They have wall boxes and ceiling J-boxes Obviously these are mostly for new construction or extensive remodels but should be considered especially for exterior walls.
You foam the slots where the wires pass through and no more leak.
As of 12/6/10
SG-1 $2.89 each 40 per case
2G-2 $4.98 24 per case
RD-1 $4.55 36 per case
FR-1 $7.70 15 per case
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