Technical Library/Slab Formwork Spacing Calculator
Engineering Evaluation Tool

Slab Formwork Load & Shoring Grid Calculator

A practical, code-compliant utility to compute concrete deck dead loads, ACI 347 live loads, structural shore prop capacities, and safe maximum grid layout spaces.

Structural Inputs

8 inches (20 cm)
4" (Light slab)12" (Thick deck)24" (Heavy podium)
10 feet (3 m)
6ft (Low ceiling)10ft (Standard commercial)16ft (Double height lobby)
5,000 sq.ft.
Shoring Safety Factor Multiplier
Calculations relate to Class D-extension telescoping props under standard temperature ranges. Real-world site audits must be stamp-certified by a licensed Professional Engineer (P.E.).

Active Stress & Load Analysis

Live Computations
Wet Concrete Load

100 PSF

Based on 150 lbs/ft³ weight
Construction Live Load

50 PSF

ACI 347 workers & fleet cap
Factored Design Load

225 PSF

Combined with 1.5x safety
Recommended Safe Spacing

Recommended Spacing Grid: 4.5 ft × 4.5 ft

To safely support 225 lbs per square foot, telescopic props extended to 10 feet must be spaced on a maximum 4.5ft square grid layout layout.

Max Grid Spacing (Calculated)5 ft

Quantified Layout Bill of Materials (Projected)

Estimated inventory payload required to complete a single monolithic floor pour of 5,000 sq.ft.

Aluminum Handset Panels

434.7 Panels

Assumes lightweight 150x75cm primary slab decks.

Telescopic Shoring Props

271.7 Shores

Class D standards designed for exact 10ft ceiling height. To adjust heights, review components.

Early Stripping Dropheads

271.7 Heads

Quick-release strike plates to drop panels early while shoring props remain under stress loads.

Need precise certified layout diagrams?

Submit your real structural blueprints (.dwg/.pdf). Our engineers will model your slab thickness and calculate props counts.

Request CAD Proposal
Close up of a construction design workstation modeling maximum deck spans and proper grid arrangements for Slabform
Pre-Pour 3D ModelingCustom CAD Grid Optimization

Every floor thickness has a distinct load curve. Our CAD technicians calculate bending moments on wood or aluminum joists to optimize shoring layouts.

Polished highly reflective superflat concrete industrial warehouse slab poured with Slabform handset formwork panels
The Resulting StructureExceptional Concrete Flatness Achievements

Rigid handset panels with precise lock interfaces guarantee zero deflection or standard deviation failures on the ceiling line below.