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  1. hammerit

    Concrete roof forming

    I'm planning on building a couple of underground rooms with concrete roofs. I was thinking that small steel I-beams spaced 2 feet apart would work. The rooms would be 8' wide x 30'. The concrete will be about 4 inches thick. Between the ibeams would be either 1/2 or 3/4" plywood. Does...

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