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poured basement condesation on insulation & plastic barriers

poured basement condesation on insulation & plastic barriers


Old 11-18-08, 12:56 PM
Thread Starter
Join Date: Nov 2008
Location: minnesota
Posts: 2
poured basement condesation on insulation & plastic barriers

We began a basement renovation to remove 40 year old wood paneling from all the walls. When we took off the paneling we found mold up about 2 feet on the sheetrock. We ended up taking off all of the sheetrock, insulation R3 value, & the 2 x 2 framing. I put a weatherproof paint on the poured basement walls. Put a poly plastic liner on the walls, new 2 x 4 framing, R14 value insulation, and another plastic sheet over all of this. Some electrical work required us to remove a piece of this & we discovered the plastic & insulation were moist with condensation. We decided to check a piece of new sheetrock in another room & found condensation & ice on the insulation & plastic as well. Does anyone have any idea of what we should do at this time. I'm ready to call HGTV Over our Heads as I don't know what in the world to do.
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Old 11-19-08, 06:07 AM
Join Date: May 2008
Location: Connecticut
Posts: 124
Here's the problem

when you installed a vapor barrier (the poly plastic liner) your kept the water from seeping in through the walls from evaporating into the basement.

However, the water remains infiltrating the walls through capillary action, and it condensates behind the poly sheet. All that moisture build up need to be diverted somewhere, or it will find it is way back into the basement, soaking the insulation and the brand new drywall. That, according to you, is already happening.

(The waterproof paint did little to prevent this, because such sealants are not made to withstand hydrostatic pressure.)

You need to provide some sort of drainage system to collect all that water coming in behind the poly sheet and divert it to a sump pump to get it out and away from your basement walls for good. Other than that, you will not be able to keep this problem from reappearing.

Installing drain tiles along the internal perimeter of the basement will accomplish that, and more. It will also help relieve the hydrostatic pressure that is causing the water to seep in through.

It is a simple, mess free and very affordable way to dry your basement, fix the current problem and avoid future ones.

Here's a excellent article on basement science:
Basements: Everything you Wanted to Know and More about your Basement or Cellar

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