Glossary of Home Improvement Terms

Caisson

A type of pole that is inserted for the structural support of a future patio, garden wall, or other structure in an area where unsatisfactory soil exists. The Caisson will rest on the underlying bedrock or on satisfactory soil.

To construct the Caisson, a 10" or 12" diameter hole is drilled down into the earth to at least 3 feet into bedrock. Two or more sticks of rebar, reinforcing bars, are inserted into the full length of the hole. Concrete is then poured into the hole.

Also see Rebar.

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