Comment 36490

By Ted Mitchell (registered) | Posted December 20, 2009 at 19:25:50

@ Mr. Meister

I believe the wall thickness is 12.5", so 3.5" is 28% of the total. I guess you can get away with this ratio as long as inside humidity is fairly low.

So everyone else knows what the potential problem is, say it is 20 degrees inside and -20 outside and the vapour barrier is at 50% thickness. Then the temp at that point will be zero, so condensation will form from inside humidity and it will get moldy. Bad.

Braden has an air exchanger (it wasn't yet installed when I toured the house) and by varying the rate of air exchange you can take care of the humidity problem. This is at a slight cost of heat loss.

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