And as more water evaporates, more salt accumulates, so the concentration of salt goes up. What’s so bad about salt and water? The physics of the osmosis forces works like this: water takes the salt in solution to a surface, the water evaporates, and the salt is left behind. It’s a wonderful way to do it in new construction, but it’s tough if you’ve got a 100-, 200-, or 300-year-old structure to deal with. You don’t have to worry about salt, and you don’t have to worry about capillarity - life is good. _ Osmosis isn’t a problem everywhere In new construction, it’s real easy: you coat the top of the footing, you’ve got your stone (capillary) break, you’ve got your dampproofing. He also offers some solutions to this common problem. Joe explains how water and salt move through masonry by osmosis, often causing serious damage to foundations. Joe Lstiburek compared air barriers and vapor barriers, and explained how airtightness helps keep homes free of mold and rot. John Straube of Building Science Corporation._ For information on attending a live class, go to _This podcast series is excerpted from a two-day class called “Building Science Fundamentals” taught by Dr.
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