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Have You Sealed Your Crawlspace?

1625 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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As an Insulator for 22 years I agree with JGANDEE. Except in your area. I would use 1 1/2" to 2 1/2" FOIL FACED FOAM such as Thermax for an exposure rating to fire, with all joints taped with FSK or a foil tape. Anything else needs to be covered with drywall for a fire rating.(check your local codes for your exact needs in foam) Good luck, Its not too difficult of a job.
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