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Northwest Vented Crawl Spaces
I wish vented crawl spaces would just go away.
We could then turn the entire conversation into a discussion about conditioned crawl spaces. It is still the norm to have vented crawl spaces in the Northwest.  New vented crawl spaces are being built every day, in numbers much greater than conditioned ones.
It is important to understand how crawl spaces work because we are going to continue seeing them in older construction, as well as in newer construction.
If you live, or have lived, in other parts of the country, some of this may seem counter intuitive.  One could create problems in the crawl spaces of Minnesota or Georgia if one did some of the things we have to do in the Northwest. 
The numbers one puts in the equations are different, but the science is the same.
Getting just a few things right will allow a crawl space to behave itself and manage moisture conditions adequately.
The crawl space should be constructed such that vents can be installed on at least 3 sides.  A good vapor retarder on the crawl space floor is essential to the success of most crawl spaces. 
It would be nice if all the seams of the plastic were welded together and all ... more

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