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Old 01-03-2012, 07:11 PM   #1
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Block basement walls

Is there any benefit to filling existing hollow block basement walls with expandable foam for moisture proofing and insulation? If yes, what is the best product and technique?


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Old 01-03-2012, 08:44 PM   #2
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Would concrete be cheaper?

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Old 01-03-2012, 08:50 PM   #3
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From a waterproofing standpoint, there is no benefit.

From an insulation standpoint, it could help somewhat or minimally. Unfortunately, most people do not recognize the lack or need for below grade insulation. Due to the thermal inertia/stability of the soil, the ground is probably not much below 55F, no matter how far north you are and the soil temperature has little correlation ot the exterior AIR temperature. It has little to do with the code prescribed frost depth. Usually, it is quite uniform and similar to the average annual air temperature once you get down a few feet.

If you condition the basement space, there is a benefit regarding AC cost in the summer because the return air is cooler and reduced the house cooling load and insulation can eliminate that benefit if the basement is about the same area as the upper floor.


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Old 01-03-2012, 09:01 PM   #4
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no, none
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Old 01-03-2012, 09:10 PM   #5
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I know of no good way to shoot it in there. Most often this gets done as the walls being built. Once it's up you have no access to the top of the wall.
Most often it's got to be insulated by adding foam board on the inside or outside of the walls and siding, sheetrocking over it.
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