Question

I want to minimize, if not eliminate, condensation on the inside of my block foundation. What's the best way?

Asked by Ellessebee
Mount Kisco, NY

I want to minimize, if not eliminate, condensation on the inside of my block foundation. There is no actual water penetration but moisture on the blocks due to condensation. I have been told that insulating the block on the outside will help. Does this make sense? Is this better than insulating on the inside? I am more concerned with condensation than with any heat loss that might occur.

Answer

Ellessebee,

I have two recommendations.

Insulation on the exterior of the foundation is the best method. If you can install it on the exterior install a minimum of R-10. Also make sure that the insullation is treated for ground contact.

Install a dehumidifier to remove moisture from the air in the basement or crawlspace. This will eliminate the moisture in the air that is condensing on the block walls which are colder.

 

For more information:

Read "How can I install insulation in my downstairs, built with cinder blocks?" a Q&A answered by Harold Remlinger.

Tagged In: residential foundation

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