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Air Tightness

Energy Efficient Designs Toronto

Even if you build the most insulated home it will not matter if your house is full of air leaks.  The thermal envelope will filter moisture and air through and thereby by-pass the insulation.  90% of heat loss is through infill or exfiltration.  All that moisture will leave the air at some point and deposit itself in your walls.

Air-tightness and breath-ability are two separate concepts. Like Gortex that keeps you warm but does not keep the sweat in, an air tight house made of breathable materials is the perfect combination. The air tightness deals with the majority of moisture ad the breath-ability will allow what does get in to get out.