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Hernan's Concrete Company Oakland 3544 Harrison St, Oakland, CA 94611 (510) 757-9285PolyLevel utilizes a substantial-density polyurethane foam to fill voids and stabilize and lift sinking concrete slabs. The growing Qualities of The 2-aspect urethane method allows for exact leveling on the slab.PolyLeveling, also called foam leveling or polyjackin