The Modular Stair Company

Installing The Original Modular Stair Form™ is fast and easy!

There are numerous ways to install the system but the following instructions are just one example of how to assemble a flight of stairs.

The Original Modular Stair Form™ has been delivered to site on standard pallets for economical transportation and ease of relocation around the jobsite.

No crane is required to place into position with each step box weighing in at only 8 kg.

Installation is simple with the placement of the formwork decking installed at the required height: Dimension ‘B’. The system has been designed to fit a 200 mm slab thickness to attain a neat finish to the underside of the stair form.

The width of the landing form deck is the minimum required landing measurement plus 25 mm. (Dimension ‘C’). This measurement will set up the bottom step box in the correct position.

The stairwell opening (Dimension ‘A’) is the number of step boxes required x 250 mm.

Set up the temporary longitudinal support bearers and props to support the Original Modular Stair Form™.

The below diagrams are suggestions. All propping to be confirmed by your site structural safety engineer.

Below pictures are examples of bearer connection detail top and bottom.

This will ensure that the Original Modular Stair Form™ will sit flush to the underside of the finished concrete surface.

The second installation method is post slab install.

Position the bearers as per the suggested detail again to ensure that the Original Modular Stair Form™ will sit flush to the underside finished concrete surface.

The second method of installation requires the use of the Void Former kit installed into the edge of the formwork prior to pouring.

This will leave the perfect impression on the side of the concrete slab to receive the Original Modular Stair Form™.

Once the bearers have been correctly positioned and secure you can start to assemble the step boxes on top of the temporary support structure.

Each box attaches to the next positioned together by the internal plastic frame hooks.

Ensure that the hooks are fully seated to the adjacent box prior to screwing the boxes together with the screws supplied.

The holes are required to line up perfectly to guaranty the perfect fit. The base and the side of each box is required to be flush to the adjacent box.

You can either start at the top or the bottom dependant on your situational requirements.

When handling the Original Modular Stair Form™ PPE is required at all times.

Where the top or bottom step box connects with the formwork decking, install the supplied connection bar to fix the first and last step box to the decking with the nails supplied.

This connection bar will hold the form in place and ensure a clean finish to the underside of the slab once the formwork has be removed after the concrete is cured.

Install and tie off the reinforcing steel as per engineers design.

The Original Modular Stair Form™ is preferred by project engineers as they can achieve continuous rebar from the slabs into the stair form.

To help secure the top of each run of stairs to the formwork, the top internal plastic frames can be tied off to the slab rebar to prevent any movement of the stair form during a pour.

Install the internal handrail system if required and use it as a temporary handrail barrier so the stairs can be used for site access prior to pouring the concrete.