The purpose of foundation piers are to help transfer the weight of a structure to the earth. Improperly installed piers can cause settlement to the walls and floor structure as well as cracks in the sheetrock walls. They can also be responible for interior doors that are difficult to open and close.
Masonry Foundation Piers should be placed on dug out and poured concrete footings. Any shims placed on top of the piers should be either 2×6 treated lumber or 4×4 inch thin metal shims designed for this application.