Using Drill-Holes for Concrete Foundation Repair
Related Links: The number of drill-holes needed depends on the size of the slab. A smaller slab, such as a sidewalk slab no more than four feet on a side, may only require pumping grout through one or two holes in the middle of the slab. Larger slabs may need three holes, arranged in a triangular pattern. Spacing, roughly related to slab thickness, determines the total number of holes. The thicker the slab, the farther apart you can drill the holes. In most operations, the holes are drilled three to eight feet apart, but no closer than 1 foot from the edge of the slab. Unless there's a reason not to, holes should be drilled at distances approximately equal from each other. Some experienced contractors are adamant that the size of the hole is very important, others it may matter very little as long as it gets the job done so the smaller the better. The usual range is 1 inch in diameter at the low end of the spectrum, and a maximum of 2 inches in diameter at the upper end. Find a Concrete Contractor 24 Services in 221 Metros -- U.S. and Canada 
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