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Hernan's Concrete Company Oakland 3544 Harrison St, Oakland, CA 94611 (510) 757-9285PolyLevel utilizes a high-density polyurethane foam to fill voids and stabilize and raise sinking concrete slabs. The growing properties of the two-component urethane system permits accurate leveling in the slab.PolyLeveling, also called foam leveling or polyjackin