Shotcrete / Gunite Order Quantity with Rebound
Cubic yards of shotcrete or gunite to order once rebound (the fraction that bounces off and never stays) is grossed up: shot = in-place / (1 - rebound). A 500 sf face at 4 in holds 6.17 cy but needs 7.72 cy shot at 20% rebound, 8.82 cy at 30%. The applicator's field rebound governs.
Formula and source
in_place_cy = area_sf x (thickness_in/12) / 27; shot_cy = in_place_cy / (1 - rebound_pct/100); rebound_cy = shot_cy - in_place_cy.
Rebound gross-up identity by name (ACI 506 shotcrete practice); first-principles volume arithmetic.
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