Spray Fireproofing (SFRM) Material Takeoff
Spray-applied fire-resistive material - the volume, weight, and bags at the design thickness: volume = area x thickness / 12; weight = volume x density; bags = ceil(weight / bag x (1 + waste)). 5,000 sf of steel at a 1.5 in design thickness in 15 pcf material is 625 ft^3 and 9,375 lb - about 246 44-lb bags with the high SFRM rebound waste; a 2 in design takes 327 bags. The design thickness, set by the UL assembly and fire rating, drives the order.
Formula and source
volume_ft3 = area_sf x thickness_in / 12; weight_lb = volume_ft3 x density_pcf; bags = ceil(weight_lb / bag_lb x (1 + waste_pct/100)).
SFRM material-takeoff identity by name (in-place volume x density gives the weight; bags from weight and waste); first-principles takeoff arithmetic.
Audience
This tile is built for trades and the adjacent professions in the Carpentry and Construction group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.
Related tools
Posture
Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.