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As houses are built tighter, they exchange less air between inside and outside. This saves energy, but the inside air can get stale if you don't have a fan and a plan

A snowball effect of physics vs. physical structures: water carries salt to the surface of masonry, which crystallizes and can blow apart its masonry host.

A big problem, for roofs in cold climates, but what causes it and how can you fix it?

Stack effect is relentless: it is always working, when you’re awake or asleep, even during blackouts. And it feeds on itself.