Shoring, Reshoring, and Preshoring (Backshoring) (U.S. & Canada)

This document explains the differences between shoring, reshoring, and preshoring (backshoring) in concrete construction and how each method is used to safely support fresh concrete and construction loads. It describes how loads are transferred in multistory buildings, the distinction between supporting newly placed concrete and redistributing loads to lower floors, and the importance of proper authorization before removing vertical supports. The guidance references applicable U.S. and Canadian standards and reinforces safe load transfer practices in both new construction and existing structure support applications.