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Sinking Concrete
You can see here that there is now a void underneath the concrete slab causing it to sink down and cause the patio to be uneven.
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Trip hazards
Not only is this unsightly, but the location of this crack around a pool adds to the danger of tripping and falling.
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Back to Level
Once the PolyLevel is injected, the expansion of the polyuethane allows for a precise lift and stabilization of the slab.
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Looking Good!
Further advantages of PolyLevel is that the material is waterproof and will not wash out beneath the slab in the future - ideal for around swimming pools!