Portland-Cement Plaster (Stucco) Material Takeoff
Bags of portland-cement plaster for a multi-coat thickness over an area: bags = ceil(area x thickness / bag yield x (1 + waste/100)). 1,000 sf of a three-coat 7/8 in system on an 80-lb bag yielding 10.1 square-foot-inches is about 96 bags with waste; a two-coat 5/8 in system drops to 69. The coats (scratch + brown + finish, ~3/8 + 3/8 + 1/8 in over metal lath) come from the spec; the sand and lime are batched per the mix design. Distinct from mortar-mix and thinset-coverage.
Formula and source
bags = ceil(area_sf x total_thickness_in / bag_yield_sf_in x (1 + waste_pct/100)).
Portland-cement plaster bag-count identity by name (volume in square-foot-inches over the bag yield, plus waste); first-principles arithmetic.
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