Allow this concrete placement to cure for a minimum of 7 days before removing the shoring support system. As with the walls, higher strength concrete is required, with a minimum yield of 4000 psi, but a preferred design mix of 5000 psi or 850 flexural strength. Seal the buckets and carry them to the surface as needed. Place the bomb shelter roof with concrete. It isn’t ideal, but it is an effective way to keep your shelter safe and sanitary.
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