Perimeter—or French—drains are basically a drainage ditch covered with gravel for the purpose of directing water away from certain areas like foundations. While French drains used to be constructed using spaced tiles, they are now generally constructed with perforated plastic pipes that can carry larger volumes of water and allow water drainage out the entire length of the pipe as well.
Crawlspace foundations can be found in all parts of the United States. Crawlspaces and basements are not different other than lower ceiling height in a crawlspace, yet there are different building codes for basements and crawlspaces. The only reason to build a home with a dirt crawlspace is to save money.
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