Foundation Walls in Crawlspace Houses

Foundation walls in ventilated crawlspaces are substantially different from walls in basements and unventilated crawlspaces. In basements and slab-on-grade buildings, it is clear that barriers should be applied between the soil and the foundation or be the foundation itself. With ventilated crawlspaces, there are two locations that present themselves for the application of barriers. First, as in the other, barriers can be placed between the soil and the foundation. Second, a barrier effort can be made between the crawlspace and the upstairs living area at the floor deck. The second option will be treated in a following section. If the first option, making a barrier between the soil and the crawlspace, is selected, then the basement wall details that apply to sealing open blocktops and preventing the foundation from cracking also apply to the crawlspace walls.

31.4.3 Floors in Basements, Slabs on Grade, and Crawlspaces

As already pointed out, poured concrete is a good retarder for radon gas and soil gas. The major problems will be cracks, joints, and penetrations. The focus of this subsection will be on crack prevention and sealing joints and penetrations. A good deal of this material applies to both poured concrete and masonry walls.

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