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Light, stiff, reusable
This is our own model of the beam. It sits on the prop heads and carries the secondary beams.
Scroll to see how it is built · drag to turn it round
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Primary Steel Beam
The primary beam of our slab formwork: pressed steel webs with triangular openings that take out weight, and a timber insert on top to nail the soffit to.
Built to your size
Three standard lengths.
Primary beams come in 1.8, 2.4 and 3 m. The model shows a 2.4 m beam.
- 5 kN.m
- moment
- 7.5 kN
- shear
- 210 kNm²
- flexural rigidity
- 3.0 kg/m
- weight
Explore the model
How it is built.
Scroll: the camera moves to each part in turn and ends on the exploded view. Drag to turn it round yourself.
Loading model
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Triangular openings
Two pressed steel webs with triangular openings take out weight and keep the strength.
- Moment: 5 kN.m
- Shear: 7.5 kN
- Flexural rigidity: 210 kNm²
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Timber insert
A timber insert runs along the top, so the plywood soffit can be nailed straight to the beam.
Why Allmarc
Experience you can trust.
We fabricate to your drawings and prove the fit in our own bay before anything ships. Open any line for the detail.
Talk to an engineerMade in our own plant
- In-house machining and robotic welding cells.
- Every panel and standard to the same jig.
One supplier
- Scaffolding, formwork and shoring that work together.
- One order, one delivery, one point of contact.
Built for reuse
- Galvanised steel and film-faced plywood.
- Designed for many cycles, not one pour.
Engineered to code
- Allform rated to 50 kN/m² concrete pressure.
- Designed to IS codes.
Start a project
Send us a drawing
Have a drawing? Let us build it.
We fabricate to your design, from plate to a packed container. An engineer will tell you honestly how we would build it.