A structural wood member used at the ridge of a roof to support the ends of I-joists and transfer roof loads to supports.

OSB Sheathing
Oriented Strand Board—Manufactured from waterproof heat-cured adhesives and rectangularly shaped wood strands that are arranged in cross-oriented layers, similar to plywood. This results in a structural engineered wood panel that shares many of the strength and performance characteristics of plywood. Produced in huge, continuous mats, OSB is a solid panel product of consistent quality with no laps, gaps, or voids.
OSB Sheathing.
Plywood Sheathing
Plywood—manufactured from thin sheets of cross-laminated veneer and bonded under heat and pressure with strong adhesives. Plywood is also referred to as a wood structural panel.
Plywood Sheathing.
Structural Insulated Sheathing
Structural Insulated Panels—High-performance building panels for floors, walls, and roofs in residential and commercial buildings. Each panel is typically made using expanded polystyrene (EPS), or polyisocyanurate rigid foam insulation sandwiched between two structural skins of oriented strand board (OSB).
Structural Insulated Panels.