Pool Gunite Shell and Plaster Volume
Gunite shell and plaster for a pool, both driven by the interior surface area.
Example
You enter
- Pool length (ft) 30
- Pool width (ft) 15
- Average depth (ft) 5.5
- Gunite shell thickness (in) 8
- Plaster thickness (in) 0.375
- Gunite waste allowance (%) 15
You get
- Interior surface area 945 ft^2
- Gunite shell 26.8 cy
- Plaster coat 1.09 cy
Details, formula, and sources
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 of this. Distinct from the water pool-volume.
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.
The volume arithmetic is public first-principles; the shell and plaster thicknesses come from the spec.
Estimate. AHJ and licensed professional govern.
Field names used by the API: length_ft, width_ft, avg_depth_ft, shell_thickness_in, plaster_thickness_in, waste_pct, interior_area_sf, gunite_cy, plaster_cy
- Interior area floor (L x W) plus walls (2 x (L + W) x avg depth) for a rectangular poolfirst principles
- Shell / plaster ~8 in gunite shell and ~3/8 in plaster (defaults); the spec governspool structural spec