This document defines and describes various building materials and components used in construction. It provides definitions and functions for items like air barriers, attic ventilation components, backhoes, batter boards, brick arches, cladding materials, concrete joints, concrete masonry units, doors, electrical components, framing elements, insulation materials, lintel, mortar, plumbing fixtures, plywood, rebar, roof drainage components, roof materials, roof shapes, stone materials, vapor retarders, waterproofing, weep holes, welded wire fabric, and windows.