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Raised patio on island

user-5487038's picture

Southern Georgia. Hard packed sand soil.  2’ tall stacked block wall.

 Need base other than compacted sand?

Insufficient information. (post #216253, reply #1 of 5)

Insufficient information.


Of all the preposterous assumptions of humanity over humanity, nothing exceeds most of the criticisms made on the habits of the poor by the well-housed, well-warmed, and well-fed.  --Herman Melville

Raised patio (post #216253, reply #2 of 5)

sorry...I’ll explain.   Location is Jekyll island Ga. the island is hard packed sand from river runoff. The project is a raised patio.

wall height is about 24”.  We pour footers, etc on the hard pack but not sure if the smaller footprint of a block wall will have a tendency to shift.  At other locations I always build on a stone fill base...never on sand.

so....you think I should over excavateband compact some rock....or just build on the sand base.

Depends on the nature of the (post #216253, reply #3 of 5)

Depends on the nature of the sand, and the subterrainian water flow.  Some sand is remarkably stable, some sand ain't.


Of all the preposterous assumptions of humanity over humanity, nothing exceeds most of the criticisms made on the habits of the poor by the well-housed, well-warmed, and well-fed.  --Herman Melville

The stone base is there for (post #216253, reply #4 of 5)

The stone base is there for drainage not bearing capacity. If your slab is reinforced you wont need to worry much about capaccity.

Yes, but not a lot. 6 inches (post #216253, reply #5 of 5)

Yes, but not a lot. 6 inches of gravel will do the job on hard packed river sand. If the sand is soft yolu'llneed more depth and width. 

Florida Licensed Building Contractor, 50 years experience in commercial remodeling, new homes, home remodeling and repairs and all types building maintenance.