Galvanized Duct Sheet-Metal Weight Takeoff
Duct sheet-metal weight from the perimeter, run, and gauge - the number that sizes the coil order and the hangers: perimeter = 2 x (width + height); weight = perimeter x length x sheet weight x seam factor. A 24 x 12 in run, 100 ft long in 24-gauge galvanized, is about 798 lb once the SMACNA seam-and-reinforcement allowance is counted; a heavier 20-gauge run is over 1,140 lb. The gauge schedule is the lever; fittings are taken off separately.
Formula and source
perimeter_ft = 2 x (width_in + height_in) / 12; area_sf = perimeter_ft x length_ft; weight_lb = area_sf x lb_per_sf x seam_factor.
Duct sheet-metal weight identity by name (developed area x per-gauge sheet weight x seam allowance); first-principles takeoff arithmetic.
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