Pool Gunite Shell and Plaster Volume
Gunite shell and plaster for a pool, both driven by the interior surface area: interior = length x width + 2 x (length + width) x avg depth; gunite = interior x shell / 27 x (1 + waste); plaster = interior x plaster / 27. A 15 x 30 ft pool averaging 5.5 ft deep has 945 sf of interior, so an 8 in gunite shell is 26.8 cy and a 3/8 in plaster coat is 1.1 cy; a deeper 7 ft average grows the interior to 1,080 sf and the gunite to 30.6 cy. Gunite rebound is on top (see shotcrete-rebound-quantity). Distinct from the water pool-volume.
Formula and source
interior_area_sf = length_ft x width_ft + 2 x (length_ft + width_ft) x avg_depth_ft; gunite_cy = interior_area_sf x (shell_thickness_in/12) / 27 x (1 + waste_pct/100); plaster_cy = interior_area_sf x (plaster_thickness_in/12) / 27.
Pool interior-finish identity by name (interior from floor plus walls; gunite and plaster volumes over the interior area); first-principles arithmetic.
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