Perforated Pipe
Some crawlspaces have a perforated pipe around the perimeter to catch wall seepage
Post
Crawlspaces with moisture can cause posts to rot and stop working efficiently
Pipes and Ventilation
Vapor barriers can be installed even if pipes and vents are in the way
Dirt Crawlspace
Vapor barriers can help prevent moisture in the crawlspace
Sump pump
Sump pumps can help mitigate the amount of moisture in the crawlspace