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Have You Sealed Your Crawlspace?

1629 Views 11 Replies 8 Participants Last post by  LLigetfa
Our summer place has a crawlspace. Years ago the pipes and beams had a lot of condensation. We laid plastic sheets on the dirt and added ventilation which stopped the condensation but the first floor of the house is still damp most of the time. The thin plastic is beginning to decompose and some of it has been moved around over the years. I believe that most of the dampness is coming up from the crawlspace. From what I've read, the new theory is not to ventilate but to seal it off completely. They do this by laying a 20 mil vinyl fabric on the dirt, sealing the pieces together. They also run it up the block walls and seal it at the top and around the footings. Then they close off all the vents and place removable covers on the access points. Sealing drains and dehumidifiers are also available if necessary. The job is fairly costly. I could get the materials and do it myself but I hate going down there anymore because some areas have only 1 foot of clearance. :eek: Has anyone sealed their crawlspace with "Clean Space"? :)
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I have a mostly stand up height crawlspace in my current house.

It has 6 - 8 mil sheet film laid on the dirt with 2 ft overlap at seams. The crawlspace vents are closed but not necessarily 100 % sealed.

I have a LG 40 pnt Dehumidifier set at 50% running down there. The air is clean and dry. The joists are clean and dry with no mold and look new(14 yr old house). Its a safe place to store metal items with no fear of corrosion or mold. Previous owner had it set up this way which I've continued.

I live in a fairly humid part of country, piedmont NC.

Sealing at least as good as mine with dehumidifier or better if you don't think my minimalist system will keep it dry is a good idea.
With standup room I would be putting in a basment.. Or at least a door to drive my tractor into...
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