Cement Board (Tile Backer) Sheet and Screw Takeoff
Cement-board tile-backer sheets and fasteners for a tub surround, wall, or floor: sheets = ceil(area x (1 + waste) / sheet area), a 3x5 board being 15 sf; screws = sheets x per-sheet, roughly 30 to 40 corrosion-resistant backer screws at 8 in on center. A 120 sf tub surround at 10% waste is 9 sheets and about 315 screws; a 200 sf floor is 15 sheets. Add alkali-resistant mesh tape and thin-set at the joints (not counted) and set the board over a moisture barrier per the wet-area detail. Distinct from the gypsum drywall takeoff. A material-ordering estimate; ANSI A108 / the TCNA Handbook and the board manufacturer govern the fastener schedule and the wet-area assembly.
Formula and source
sheets = ceil(area_sf x (1 + waste_pct/100) / sheet_area_sf); screws = sheets x round(screws_per_sheet).
ANSI A108 / TCNA Handbook cement-board installation practice, by name; the board manufacturer governs the fastener schedule and wet-area assembly.
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