Welded-Wire Reinforcement (Mesh) Sheet Takeoff
Sheets of welded-wire reinforcement (mesh / WWF) for a slab once the side and end laps eat coverage: effective sheet = (width - side lap)(length - end lap); sheets = ceil(area x (1 + waste) / effective). A 2,000 sf slab with 5x10 sheets at 6 in laps needs 50 sheets, not the 42 a no-lap count suggests.
Formula and source
effective_sheet_sf = (sheet_width_ft - side_lap_in/12) x (sheet_length_ft - end_lap_in/12); gross_area_sf = slab_area_sf x (1 + waste_pct/100); sheets = ceil(gross_area_sf / effective_sheet_sf); purchased_sf = sheets x sheet_width_ft x sheet_length_ft.
Lapped-coverage identity by name (mesh lapped one full square); ACI / WRI (Wire Reinforcement Institute) practice; first-principles area arithmetic.
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