Zone 2, southeast Texas, 10 miles from the coast, new home construction…
The house will have a slab on grade foundation, with the foundation floor about 15″-18″ above natural ground level. The foundation floor will actually be the crawlspace floor, as we are building a CMU perimeter stem wall on the foundation and interior pony walls to raise the living area first floor up to almost four feet above the foundation floor. The CMU stem wall will be 32″ high (four courses), with a wood framed first floor built on top of it. There CMU stem wall will be covered by brick veneer (with at least a 1″ air gap between the two). The crawlspace will contain a dedicated dehumidifier.
The building envelope will consist of the crawlspace, living area, and attic.
Question… since the CMU stem wall and the crawl space wall are both quite a bit above ground level, does spraying 2″ of closed cell foam on the interior wall of the stem wall have much benefit? Since it’s above ground, is the added insulation value of the CC foam helping very much? Are there other solutions that would be equally effective, but less expensive, or does anything need to be done for the CMU stem wall?
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