Basement Humidity & Crawl Space Humidity

Whenever the outside air is warmer than the inside air, and especially when the outside air is humid, we are likely to have a condensation problem in our basements or crawl spaces. This is because the Relative Humidity of air goes up 2.2% for every one-degree you cool it. Our basements and crawl spaces are always cool because they are below ground. And we know that a house is like a chimney � air flows upwards, allowing air to escape the upper levels, with new make-up air being sucked in at the lower levels.

So when it�s hot and humid in the summer, rain or not, our basement may be the wettest it has been all year!