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chadlefler 01-14-2010 01:11 PM

Basement Condensation
i am finishing my basement and it always stays nice and dry all summer and most of the time in the winter. Except when it gets really cold. When it gets cold and starts to warm the condesation on my walls gets pretty bad. I want to install engineered wood floors however amy worried about damage and mold during this rare occurence. We just had a cold snap and I had 2 different spots on my wall that condestin ran down the wall. ANy suggestions how to control this. I was told once I insulate the interior walls I should not have the problem anymore?

concretemasonry 01-14-2010 01:19 PM

Poor air circulation in the basement and excessive moisture in the air. Do you have adequate cold air returns in the basement?

Since you have finished the basement, you want it to be a conditioned space. Wood in meant to be installed in a conditioned space with circulation.


chadlefler 01-14-2010 01:24 PM

I do have good cold air return and vents in every room. It is a 9ft basement

Bob Mariani 01-14-2010 01:59 PM

insulating the exterior walls with 2" of spray foam or 2" rigid foam will help. Otherwise you need to use a dehumidifier. Humidity must be kept below 50% for comfort and mold prevention. Warm moist air hitting a colder surface will condense. Warm the cold wall and/or remove the excess moisture.

chadlefler 01-14-2010 05:25 PM

Could I possibly under ventilated in my attic. My hous is 10 yrs old the contractor at the time did not add sophit insulation. He said that was the old way, It has ridge cap ventilation?

Bob Mariani 01-15-2010 06:50 AM

The attic requires a balanced vent system. The intake through both soffit vents should match the exhaust out the ridge vents.

chadlefler 01-15-2010 08:21 AM

So could this cause a problem in my basement? How do I know if I have enough ventilation? Is there a way to test

Bob Mariani 01-15-2010 08:22 AM

A blower door test. Contact a local BPI contractor.

chadlefler 01-15-2010 09:40 AM

BPI? Also mentioning that I also notice that I have an exterior door that is difficult to shut. Because of air pressure. Could this be a sign of anything

Bob Mariani 01-15-2010 09:42 AM

Same contractor can address all of this. BPI -- Building Performance Institute

Gary in WA 01-16-2010 02:31 PM

You can check some things yourself:
The math:
Some problems:
Stack effect:
Be safe, Gary

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