29 Aug '15, 5pm

@Carrie_Behar here's a link discussing the same question

I think many have a fundamental misconception of the purpose of breathable walls, air tightness etc. There's two things you want in a wall (besides insulation): air tightness and moisture resistance. In other words, you don't want the rain from the outside getting to the interior of your house. You also don't want water condensing inside the wall (and associated insulation). For the occupants of the building, they require fresh air and the removal of excess moisture - four people generate a surprisingly large amount of water vapour per day - far more than could be transpired through a breathable wall. The outer skin of the building should be air tight but vapour permeable. This is to allow any moisture which gets into the wall structure to escape to the outside. Brick is permeable and, even with a cavity, moisture will end up in the wall structure. If this can't escape, al...

Full article: http://www.greenbuildingforum.co.uk/forum/index2.php?DATE...

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