DIY crawlspace encapsulation

[Rich Riesmeyer]

Bought my first rental about 4 years ago.    When we had our initial termite inspection, they recommended we install gravel and drains in the crawlspace along with a sump pump.    That helped, but, this being South Carolina, it is still to moist.   RH in the crawlspace was 94%, outside is 77%.  He also said moisture readings in some joists were in the 20-30% range.

 So now I am looking at encapsulating and a dehumidifier.   Been looking on crawlspacedepot.com, and I think we can handle the job.   Question, is it important to insulate the foundation walls?   It rarely gets below freezing here and we are talking about 18-24 inches of wall, and have to leave 3" for termite inspection.   Any tips or things to watch out for is appreciated.   Thanks in advance...

Rich