Panel Bears on Ledger at Beam
Roof or floor panel bears on ledgers connected to wood beam with partially-threaded screws. Positive connection of panel to ledger is made with partially-threaded screws.
Purpose: Transfer of vertical load from roof or floor panel to wood beam. Can also transfer shear along the length of the beam.
- Capacity of primary load path is controlled by perpendicular-to-grain bearing capacity of floor panel or ledger, or shear capacity of the ledger fasteners.
- Elevation control of ledger is critical.
- Screws that connect ledger to wood beam can be installed diagonally to increase capacity.
- In panel design, consider that panel is not continuous across connection and multi-span conditions may not be achievable.
- Best practice according to APA and AITC is for dowel-type fastener connections in the side of a mass timber beam to occur above the neutral axis. In some situations, loading can occur below the neutral axis if fullythreaded reinforcing screws are installed to resist forces that cause tension perpendicular to grain. See MTC Solutions’, Full Thread SWG ASSY Screws as Reinforcement.
- Class 1
- Load Low
- Cost $$
- Constructability Moderate
- Fire Rating II