Damp Crawl (Answer)

Hi Debbie,

It sounds like you have a good start on fixing your problem. Yes, the vapor barrier should cover the floor completely. Also, the seams should overlap and be taped to seal them.
Condensation builds up as a result of temperature differences, so if the crawl space temperature stays close to the temperature outside, the condensation problems decline. Here is a list of things to consider:
 Make sure you have good cross ventilation in the crawlspace.
 Make sure that the vapor barrier is sealed everywhere.
 Make sure that the insulation under your floor is adequate and in place.
 All exposed ductwork and plumbing lines should be insulated.
In the very worst case, to solve the problem, you may have to install a dehumidifier.
There are a number of fungus killers on the market that would help. I recommend that you achieve good ventilation in the crawlspace first, and then see how bad the fungus is at that point. In many cases the ventilation alone will cure the fungus problem.

Hope this helps, and thanks for your question.

Al

Send questions to: agarrett@hometeaminspection.com Put "handyman question" in subject box.