Material Specifications

Grade Stamps - Each piece of lumber for foundation construction require a permanent grade stamp by an agency recognize by the American Lumber Standards Committee and for plywood by an agency recognize by the U.S. Department of Commerce PS1.

Foundation Quality Mark - Each piece of lumber and plywood used for the permanent wood foundation system and required to be treated, must meet the Standard AWPA-C22, and each piece must bear a permanent Quality Mark indicating for Permanent Wood Foundation use.

Nails - Generally, all nails used for permanent wood foundation construction may be hot dipped galvanized - all plywood connection below finish grade must be stainless steel type 304 or 316. Connections in knee walls and brick ledges shall be stainless steel nails. Electroplated galvanized nails for plywood are prohibited.

All foundations must be designed.