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SnowFlakeUsername2 t1_jabnm5h wrote

Reply to comment by UncleBobPhotography in Add additional insulation to walkout basement wall cavity. Good idea? Bad idea? by hoppyending

Could have the terminology wrong. Where I live we typically call the interior the warm side. I'd also guess it is about temperature differential. The condensation problem is much worse going from humid 20c into dry -30c.... plus the moisture on the cold side isn't warm enough to dry the insulation and foundation. So vapour barrier goes on the inside with it's most important job being to keep warm interior air from condensing into a cold wall. In the summer, any moisture inside a wall can dry out and escape out the non-barriered wall.

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UncleBobPhotography t1_jabozqs wrote

I think you've got the terminology right, we say the exact same thing here in Norway. The difference is just that in Norway, the inside is always the warm side. I'm pretty sure you would do it the other way around in Sinagpore.

Especially if you live in a fairly dry area I guess 30c outside won't make too much of an issue in the summer since it's just 5-10 degrees warmer than the inside which is not much compared to the 50c difference you could get in winter.

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