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CONCRETE RAISING TO LIFT SUNKEN SLABS
The most practical and common application for concrete raising is simply raising sunken slabs back up to their original level. Slab sink for a variety of reasons: soil erosion, poor soil preparation, soil movement. The slab sinks because there is simply less soil under it to support it.
Concrete raising simply replaces the missing soil with a sturdy material that is not prone to erode or shrink. The best material is a fine aggregate like sand mixed with clay. Download material specifications here. Compare this material to polyurethane by Clicking Here.
The only evidence of the process are the small (1-5/8 inch) holes drilled though the concrete. These are patch with cement and often match well with the existing concrete surface. In fact, most times, concrete raising looks even better than removal and replacement because the original slab matches surrounding slabs.
Raising slabs is not an easy process that should be attempted by anyone but an experienced concrete raising professional (click here to contact one in your area) . And any contractor that offers concrete raising should be willing to offer a lifetime guarantee on their materials.

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