Substructure

When designing the deck substructure, it is preferable to use standard length dimension lumber. This eliminates cutting labor and the possiblity of cutting errors, and results in structural boards that do not have inner untreated regions exposed.

Most deck substructures are built primarily of treated lumber.

For information on fasteners, please see our fasteners page.

Typically, 4x4 or 6x6 posts are supported by concrete footings. The posts in turn support horizontal beams made of 2x8s, 2x10s, 2x12s or 2x14s. The beams in turn support floor and rim joists, also made of 2x8s, 2x10s, 2x12s or 2x14s.