Several passes with a screed board evens out the pad and knocks down the high spots. Low spots must be filled with fresh concrete and several more passes with the screed board ensures the top is flush. Here workers float the surface to force gravel down and allow excess water and air pockets rise to the top until the slab is smooth.
After the support columns are set, the next step is to prepare the crawl space. The pads are covered with gravel and fine sand and then topped with a layer of plastic. The plastic serves as a vapor barrier and helps prolong the life of the pad. Workers measured and cut steel mesh to the shape of the pad to reinforce the concrete.
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