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Calcimator

Precast Joint Sealant Calculator

Calculate sealant volume, cartridges, backer rod, and cost for sealing joints between precast concrete panels.

Inputs

lin ft
in
in
%

Results

Standard cartridges (10.3 oz)

100

Sausage packs (20 oz)52
Pails (1.5 gal)6
Total sealant volume1,856.3 cu in
Backer rod diameter0.94 in
Backer rod needed500 lin ft
Sealant cost$1,000.00
Backer rod cost$22.00
Total material cost$1,022.00
Est. labor hours5 hrs
Width:depth ratio2
Max joint movement0.38 in
How to Use This Calculator
  1. Enter the total linear feet of joints and the joint width in inches measured at the widest point.
  2. Set the sealant depth in inches — ideal is half the joint width (2:1 width-to-depth ratio).
  3. Choose sealant type: 0=silicone (±50% movement), 1=polyurethane (±25%), 2=polysulfide (±25%).
  4. Select the application method: 0=caulk gun (cartridges) or 1=bulk gun (sausage packs).
  5. Read Cartridges Needed (10.3 oz) or Sausage Packs (20 oz) and Backer Rod (linear ft) to build your material list.
  6. Verify Width:Depth Ratio is close to 2:1 and check Max Joint Movement (in) against your expected thermal movement.

How the result changes with Total joint length

Total joint lengthStandard cartridges (10.3 oz)
5,001999
17,5013,495
32,5006,490
45,0008,986

What each input means

Total joint length
Total linear feet of joints to seal.
Joint width
Width of the joint gap between panels.
Sealant depth
Depth of sealant bead (ideal: 1/2 of joint width).
Sealant type (0-2)
0=Silicone (±50% movement), 1=Polyurethane (±25%), 2=Polysulfide (±25%).
Waste factor
Material waste percentage (tooling, cleanup, spillage).
Application method (0-1)
0=Caulk gun (cartridges), 1=Bulk gun (sausages/pails).

What each result means

Standard cartridges (10.3 oz)
Number of standard 10.3 oz caulk cartridges needed.
Sausage packs (20 oz)
Number of 20 oz sausage packs if using bulk gun.
Pails (1.5 gal)
Number of 1.5-gallon pails for bulk application.
Total sealant volume
Total sealant volume including waste.
Backer rod diameter
Recommended backer rod diameter (25% larger than joint width).
Backer rod needed
Linear feet of backer rod required.
Sealant cost
Material cost for sealant only.
Backer rod cost
Material cost for backer rod.
Total material cost
Combined sealant and backer rod cost.
Est. labor hours
Estimated labor hours for one applicator.
Width:depth ratio
Joint width to sealant depth ratio (ideal is 2:1).
Max joint movement
Maximum joint movement the sealant can accommodate.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Total joint length = 500, Joint width = 0.75, Sealant depth = 0.375, Sealant type (0-2) = 0 = 6 input(s) provided
  2. Calculate Standard cartridges
    Standard cartridges
    100 = 100
  3. Calculate Sausage packs
    Sausage packs
    52 = 52
  4. Calculate Pails
    Pails
    6 = 6

Engine last updated .

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