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Old 04-02-2012, 07:53 PM   #1
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Drywall on concrete foundation wall


Looking for some insight/suggestions:
The issue I have is the foundation walls in a basement have been drywalled, but directly on the concrete, below grade. Needless to say the drywall is crumbling, and I want to replace it. The house foundation has been waterproofed so major water is not an issue. I don't have room to fully frame new walls but if I strap out the new drywall with 1x3's to allow for some airflow, will it avoid the condensation buildup?
I am also thinking about using a paint-on waterproofing on the concrete just to ensure no moisture is seeping through the concrete.
Any thoughts?

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Old 04-02-2012, 07:56 PM   #2
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Drywall on concrete foundation wall


Build your frame 1" off the wall.
Wood should not have contact with the block.

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Old 04-02-2012, 10:53 PM   #3
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Drywall on concrete foundation wall


I'd rather spend the money on foamboard than Dryloc: http://www.buildingscience.com/docum...study-analysis

Any air gap will give convective looping to rob you of heat: http://joneakes.com/jons-fixit-database/743

Wood walls require fire-blocking every 10' lineally: http://publicecodes.citation.com/ico...002_par031.htm

ADA the drywall to prevent conditioned air from reaching the concrete wall: http://www.buildingscience.com/docum...wall-approach/

Air seal the rims first, canned foam the f.b. perimeter, hold drywall 1/2" above slab.

Gary
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Old 04-02-2012, 11:24 PM   #4
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Drywall on concrete foundation wall


Thanks GBR! Those links are really helpful. I appreciate it.
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Old 04-06-2012, 12:42 PM   #5
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Remember if you do use strips on the concrete, they must be pressure treated...
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Old 04-06-2012, 10:42 PM   #6
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Drywall on concrete foundation wall


Bj and sublime2 brought up a good point in the previous posts. If under the "I" codes, a poly plastic or poly sill sealer (better as it is an air/thermal/capillary break) between the wood and wall concrete/blocks:

"7. Wood furring strips or other wood framing members attached directly to the interior of exterior masonry walls or concrete walls below grade except where an approved vapor retarder is applied between the wall and the furring strips or framing members." From: http://publicecodes.citation.com/ico...9_3_sec017.htm

Touching the slab requires p.t. wood (need a 2x for base nailing and holding the drywall 1/2" up anyway).

Rim link: http://www.buildingscience.com/docum...l_seal_rev.pdf

Without an interior drain system- Fig.13.(Yours)

With an interior drain and Drylock to direct moisture (gravity) down- Fig. 15; http://www.buildingscience.com/docum...lation-systems

Gary

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