Should I insulate one of my exterior foundation walls?
I am getting some water penetration through a block wall in my basement and through the floor near the bottom of the same wall. The ground on that side of my house is currently sloping towards the house and inviting water inside. I was thinking of excavating that side of the foundation and applying a waterproof membrane to the exterior and then regrading the ground to make it slope away from the house. I was wondering if it would be worthwhile to insulate the exterior of the foundation wall, or if it would be a waste to only do one side, since there is no way that I will be able to do the rest. I was thinking that the exterior insulation might help to better keep moisture out of the basement in addition to providing insulation. My concerns are that this side of the house has had problems with termites. I have read that rigid foam on the exterior of foundations can be a problem if there are known to be termites in the ground. I have had a termite bait stations put in and we had the sill plates, the tops of the basement walls and the bottoms of the first floor walls sprayed with a boron-based treatment when the house was gutted. However, when I was digging around this weekend, I found some termites in some wood chips right next to this side of the house. Having said all of that, would it be unwise to insulate the exterior? If I could find a way to get something like Roxul Drainboard, would that be any better? Thanks for any advice.
Posted May 12, 2014 9:39 AM ET
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