Does Bottom Half Of Concrete Knee-wall Have To Be Insulated? - Insulation - DIY Chatroom Home Improvement Forum

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Old 02-23-2016, 10:37 AM   #1
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Does bottom half of concrete knee-wall have to be insulated?

We live in Oakland, California. We have an unfinished basement that we would like to finish up and insulation is on our list. The house was built in 1920. The basement is rimmed with a knee-wall foundation and the top half is framed out with studs that sits on top of the knee wall. We want to level out the wall and get rid of the "shelf" that the knee wall creates. Do we have to insulate the bottom half? Or is insulating the top half so it juts out and evens out with the knee wall enough to keep warmth in the basement?

Last edited by jet2dresq; 02-23-2016 at 10:40 AM. Reason: more details
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Old 02-23-2016, 11:43 AM   #2
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Insulate the bottom half as well.

Rigid foam works well in most basement masonry wall applications.
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Old 02-24-2016, 09:44 PM   #3
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R-5 foam or R-13 cavity insulation is required for your location, per Code. Though I'd take that with a grain of salt... your coldest 3 months average temp is 52*F above-grade. 6' below-grade the earth is warmer at 62*F. depends on inspection or not... . Could just add some builders paper and fiberglass batt on the lower 1/2;

Fix any visible water signs/problems first.

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