APA Performance Rated Rim Board is a specially designed component that is engineered to work in concert with wood I-joists to deliver a complete engineered wood framing solution.
APA Performance Rated Rim Board fills the space between the sill plate and the bottom wall plate, or between the top plate and bottom plate in multi-floor construction. In addition to filling the void, Rim Board is an integral structural component that transfers both lateral and vertical forces. To function properly, the Rim Board must match the depth of framing members, and conventional solid sawn lumber typically does not match the new generation of wood I-joists.
The following publications provide detailed information on the design and physical properties for Rim Board.