Reshoring Calculator

Calculate reshore spacing and loads for multi-story concrete construction.

Slab thickness (in)

Concrete unit weight (pcf)

Levels of shores/reshores

Reshore capacity (lbs)

Bay size (ft)

Construction live load (psf)

Tab to move between fields

Max slab load (psf)

200

Slab dead load (psf)100

Reshore load (psf)75

Max reshore spacing (in)98

Practical spacing (in)96

Actual reshore load (lbs)4,800

Reshore utilization (%)96

Reshores per bay (1 level)16

Total reshores (all levels)32

How to Use This Calculator

Enter Slab Thickness in inches, Concrete Unit Weight, and Number of Levels of shores/reshores.
Enter Reshore Capacity in pounds, Bay Size in feet, and Construction Live Load in psf.
Review Max Slab Load in psf using the Grundy-Kabaila method for multi-level shoring.
Check Practical Reshore Spacing and Reshore Utilization percentage to confirm design adequacy.
Use Total Reshores Across All Levels to plan material requirements and installation sequence.

How the result changes with Slab thickness (in)

Slab thickness (in): Thickness of the concrete slab.
Concrete unit weight (pcf): Unit weight of concrete (normal weight: 145-150 pcf).
Levels of shores/reshores: Number of levels of shores and/or reshores below the new pour.
Reshore capacity (lbs): Safe working load of each individual reshore post.
Bay size (ft): Bay dimension (assumed square) for estimating reshore count.
Construction live load (psf): Construction live load (50 psf minimum per ACI 347).

Slab dead load (psf): Self-weight of one concrete slab.
Max slab load (psf): Maximum load on the lowest connected slab (Grundy-Kabaila method).
Reshore load (psf): Load carried by reshores at each level per square foot.
Max reshore spacing (in): Maximum center-to-center reshore spacing.
Practical spacing (in): Recommended spacing rounded to nearest 6-inch increment.
Actual reshore load (lbs): Load on each reshore at practical spacing.
Reshore utilization (%): Percentage of reshore capacity used.
Reshores per bay (1 level): Number of reshores per bay at one level.
Total reshores (all levels): Total reshores across all levels of reshoring.

Identify Input Parameters
4 parameters
Slab thickness (in) = 8, Concrete unit weight (pcf) = 150, Levels of shores/reshores = 2, Reshore capacity (lbs) = 5000 = 6 input(s) provided
Calculate Max slab load
Max slab load = slabDLPsf * maxLoadFactor + constructionLL
200 = 200
Calculate Slab dead load
Slab dead load = (slabThickness / 12) * concreteWeight
100 = 100
Calculate Reshore load
Reshore load = newPourLoadPsf / numberOfLevels
75 = 75