Archibald Sheet Metal in Lakeside holds CSLB licenses #895893 (C-43 Sheet Metal) and #967283 (C-39 Roofing) and operates from its Lakeshore Drive fabrication shop near Lindo Lake County Park. Custom ductwork, flashing, and architectural sheet-metal assemblies feed directly into the HVAC mechanical packages installed by contractors like Hi-Tech Air Conditioning, Inc. on Riverside Drive. The C-39 roofing classification extends the firm's scope to standing-seam metal roof panels, membrane roofing systems, and re-roof projects using Monier concrete-tile lift-and-relay methods per County of San Diego building-permit specifications. Commercial fabrication includes galvanized and stainless-steel duct runs, range-hood exhaust transitions, and custom-bent trim profiles for tenant-improvement build-outs on Lakeside's Woodside Avenue commercial corridor. Roof-mounted solar-array installations require the same precision flashing and waterproofing details that coordinate with photovoltaic contractors like Beck Built Solar, Inc. in Lakeside. Highest-tier projects include 24-gauge galvanized spiral ductwork systems sized to SMACNA standards with fire-damper integration, seismic bracing per CBC Chapter 17, and Title 24 insulation wrap on exterior-exposed runs.