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I was just talking to one of my partners on our apartment project. We're pouring the first footings and slabs. I mentioned that it's important to make sure the guys pull up the rebar lattice after they've been walking on them. If the rebar is at the bottom of the slab, it's vulnerable to rust from the bottom, which will cause the concrete to crack due to the rust causing expansion. Spiderweb cracks are a sure sign that the concrete has failed and needs to be removed, or the structure may have to be demolished.
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