A shop drawing is a detailed construction document prepared by the HVAC contractor or manufacturer showing how equipment will be fabricated, assembled, and installed to meet design specifications. Shop drawings contain dimensions, materials, connections, and construction details not shown on design documents. They are working documents that guide fabrication and installation activities.
Content and Detail Level
Shop drawings include equipment layouts with exact dimensions, ductwork fabrication details with gauge specifications and joint reinforcement locations, piping connection details showing pipe sizes and material types, and control system wiring diagrams. Drawings indicate clearances for maintenance access, equipment mounting methods, and coordination with building structure. They reference design drawings and specifications while adding fabrication-level detail necessary for actual construction.
Approval and Construction Use
Contractors submit shop drawings to the design professional for approval before fabrication begins. The design team verifies that proposed construction methods meet specification requirements and design intent. Approved shop drawings guide the work of technicians, sheet metal workers, and equipment installers. They provide a quality control reference during construction and serve as documentation for code compliance verification and system commissioning activities.