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Calcimator

Fireproofing Calculator

Calculate spray-applied fireproofing material volume, weight, bag count, and cost for cementitious or fiber-type SFRM applications.

Inputs

sq ft
in
hr

Results

Fireproofing Weight

9,375 lbs

≈ 9 grand pianos

Material Volume625 cu ft
Bags Required188
Coverage Rate26.7 sq ft/bag
Material Cost (est.)$16,875.00
Labor Hours (est.)14.3 hrs
How to Use This Calculator
  1. Enter the total steel surface area in sq ft to be fireproofed (measure all exposed beam and column flanges and webs).
  2. Set the required thickness in inches from the UL-listed assembly (typically 0.5–3 in depending on W/D ratio).
  3. Enter the fire resistance rating in hours (1, 2, 3, or 4) required by the building code.
  4. Select the fireproofing type: 1=cementitious SFRM or 2=mineral fiber SFRM.
  5. Read Bags Required and Coverage Rate to order materials; use Material Cost for budget planning.
  6. Note Labor Hours to schedule application crews — spray fireproofing is typically applied after structure is plumb and bolted.

How the result changes with Steel Surface Area

Steel Surface AreaFireproofing Weight
1,000,0901,875,169 lbs
3,500,0656,562,622 lbs
6,500,03512,187,566 lbs
9,000,01016,875,019 lbs

What each input means

Steel Surface Area
Total surface area of steel members to be fireproofed.
Required Thickness
Required fireproofing thickness from UL listing (typically 0.5"-3").
Fire Rating
Required fire resistance rating in hours (1, 2, 3, or 4).
Fireproofing Type
Select fireproofing material type

What each result means

Material Volume
Total volume of fireproofing material required.
Fireproofing Weight
Total weight of applied fireproofing.
Bags Required
Estimated number of standard bags needed.
Coverage Rate
Effective coverage per bag at the specified thickness.
Material Cost (est.)
Estimated material cost based on type and thickness.
Labor Hours (est.)
Estimated application labor hours.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Steel Surface Area = 5000, Required Thickness = 1.5, Fire Rating = 2, Fireproofing Type = 1 = 4 input(s) provided
  2. Calculate Fireproofing Weight
    Fireproofing Weight = materialVolumeCf * density
    9375 = 9375
  3. Calculate Material Volume
    Material Volume = surfaceArea * thicknessFt
    625 = 625
  4. Calculate Bags Required
    Bags Required
    188 = 188

Engine last updated . Checked against 3 independently-derived tests — how we verify calculators.

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