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Old 08-10-2010, 02:42 PM   #1
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I have a walkout with a wood basement that has weeping tile at the footer as well as a waterproof membrane on the exterior of the wall. What I have noticed is my drywall is wet about a foot up from the bottom of the back wall that is backfilled. I have a concrete floor poured inside the wooden walls. I took the board off and checked the insulation and inside of the vapor barrier and they are dry but the bottom of the outside of the vapor barrier between the plastic and the drywall is wet. The board does not touch the concrete so I do not think it is wicking up from the damp concrete. Could it be condensation? I have the vapor barrier sealed with tuck tape as well as acoustical sealant. Any ideas what my problem is?

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Old 08-10-2010, 11:29 PM   #2
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Is there a capillary break at the edge of the concrete, or is it open to the drywall edge? It could be condensing on the drywall edge from the concrete slab. The water moves from a colder surface (concrete) to a warmer (drywall) unless the v.b. wraps the edge of the slab and goes under the bottom plate. Is the wood foundation plate a p.t. sill? Is only gravel under the plate? Or a v.b. between the plate/gravel? Is there a v.b. under the slab? Any rigid insulation foam board under the slab perimeter? Where are you located?
Have you taped a plastic- 2'x2' down on the slab overnight to check for a v.b.?

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Old 08-11-2010, 12:40 PM   #3
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I am located in Southern Sask and we have had a lot more rain this year than normal. The sill plate is pt with a foam barrier between it and the concrete footiing. The walls were built on top of the footer and then concrete was poured inside the walls on top of the gravel to provide support to the pressure on the bottom of the wall from the fill. There is no vapor barrier between the gravel and the slab and the vb I do have is down the inside of the walls and comes out the bottom of the drywall and is attached to the concrete with acoustical sealant. The drywall is not in direct contact with the concrete, it is about an inch above the surface. Not sure what you mean by using plastic 2x2 to check for vb but if you describe it I can try. Could I prevent the condensation if I fill the void at the bottom of the drywall with spray foam insulation?
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Old 08-11-2010, 02:29 PM   #4
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If you don't know that a vapor barrier was installed under the slab: tape a 2'x2' piece of 4mill. plastic down on top the slab close to the water problem. The slab may be wicking water from the outside below grade. Leave 2 days, pull perimeter tape and check for water droplets on side facing slab. If water, no v.b. Read both of these: http://www.buildingscience.com/docum...ms?full_view=1
http://www.buildingscience.com/docum...sture-problems

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Old 08-11-2010, 02:59 PM   #5
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"There is no vapor barrier between the gravel and the slab" The contractor that laid the concrete said you did not want to trap the moisture, you wanted it to come up through the concrete. I already have a foam layer between the sill plate and the foundation which I think is the capillary break you are talking about and reading the article the other thing that will prevent the moisture is painting the floor?
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