# Posted: 28 Sep 2022 14:47
There are several factors at play. Depends on the type of concrete used for the pad, the type of block used on top of the concrete, the spacing between/# of piers, and the types and quantities of materials used in the structure.
A lot of factors, I know. You'd probably need to talk to a structural civil engineer if you want a real answer. That said, the manufacturers of the concrete and blocks should be able to give you their compressive strengths. And, there are plenty of cabins built on this type of foundation with 6' or less spacing between piers.