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kbuckley

05:44AM | 06/20/04
Member Since: 06/19/04
1 lifetime posts
Bvlawn
We have a concrete patio that has several major cracks and a portion that has "heaved." Can we build a retaining wall around the perimeter of the existing slab, fill and level with gravel and sand, and lay pavers over top? Or, will we need to break up and remove the existing slab.

Thanks!

Kathy in Colorado

tomh

02:09PM | 06/21/04
Member Since: 07/01/03
550 lifetime posts
I don't have any problems with your plan, but you must consider drainage. If you elevate the patio above the elevation of your house, you could have problems. Also, leaving the concrete in place will retard drainage from the new patio, and the retaining wall will make this like a basin. Be sure to provide for drainage through the sand and gravel to the outside of the patio perimeter. Other than that, the pavers and fill should help insulate the foundation of the patio and prevent some of the frost heaving problems.

The root problem here is that inadequate depth was excavated under the old patio to prevent heaving from frost or soil expansion. You are adding that depth back on, but you don't want to create new problems.
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