CANTILEVERED STAIRS INSTALLATION & TECHNICAL DETAILS 2018-07-13T14:14:15+00:00

INSTALLATION – EARLY USE DURING CONSTRUCTION

Fixing methods

There are a number of tread fixing methods available, depending on the overall construction of the building.

Pocket fix

Steel reinforced concrete wall

Before site construction work can start, the make-up, construction and stability of the stairwell walls must be agreed. These walls must be suitable to support the chosen cantilever installation method.

Prefabricated anchoring pockets are mounted within the form work before the concrete is poured.

Installation of the steel reinforcing bars and completion of the form work.

Pour the concrete into the form work.

After sufficient curing time, the formwork can be struck and the pockets checked for any concrete ingress. If any found, it is best to remove it at this stage.

Temporary cantilevered metal treads are available to hire and can be fitted once the form work has been removed and the concrete has cured sufficiently. This will allow safe access for the construction process of the building to continue.

If the wall finish is a fair faced one, the pre-finished treads can be fitted, just prior to the occupation on the building. The wall may have a plastered or stone clad finish. In this case, short end blanks can be supplied to be used as a guide to be able to almost finish the walls. The pre-finished treads can then be fitted once the majority of the wall finish has been completed.

Installation of the pre-finished treads. Final wall finishes completed around the treads. Staircase complete.

Side fix

10 Newton High density concrete block walls or R.C. construction walls are required. Existing or to built. To be used with certain conditions

Before site construction work can start, the makeup, construction and stability of the stairwell walls must be agreed. These walls must be suitable to support the chosen cantilever installation method.

Construction of the walls as agreed.

Prior the stairwell being completed, installation of the pin pockets to take place. Depending on the chosen wall finish, short end blanks can be supplied to be used as a guide to almost pre-finish the walls. The pre-finished treads can then be fitted once the majority of the wall finish has been completed.

Installation of the pre-finished treads. Final wall finishes completed around the treads. Staircase complete.

Plate fix

Timber stud partition wall

Before site construction work can start, the makeup, construction and stability of the stairwell walls must be agreed. These walls must be suitable to support the chosen cantilever installation method.

The solid constructed timber stud walls are erected.

A steel string with a foot plate anchor is attached to the floor beneath the floor finish. A top blade is incorporated into the upper floor edge structure and the steel string is fixed to the solid constructed timber stud walls.

Prior to the stairwell being completed, the pre finished treads require attaching to the steel string wall reinforcing plate. Once this has been done and the treads have been correctly protected the walls can have their finish applied. The cantilevered stair is then complete.

Sidebar fix

Top and bottom fixing only

Before site construction work can start, the make-up, construction and stability of the stairwell walls must be agreed. These walls must be suitable to support the chosen cantilever installation method.

The main fabric of the building is constructed.

A steel box string with a foot plate anchor is attached to the floor beneath the floor finish and a top blade is incorporated into the upper floor edge structure. The steel box string can, if required, be incorporated into the wall structure. Often as part of a party wall sound reduction scheme using a stud and plasterboard system.

Prior to the stairwell being completed, the pre finished treads require attaching to the steel box string. Once this has been done and the treads have been correctly protected the walls can have their finish applied. The cantilevered stair is then complete.

CANTILEVERED STAIRS TECHNICAL DETAILS

Extremely high carrying capacity

This cantilevered staircase is available for various load categories, including T1 for stairs without significant traffic, with T2 and T3 for higher load categories. The standard T1 tread has been designed and tested to take a 750kg load, giving only a 3mm deflection at the end of a 950mm tread.

Tread sizes

Tread widths start from 800mm and rise to 1250mm. These are available in 50mm increments. Goings (tread depth) are available in sizes of 260mm, 280mm, 300mm, and 320mm. The thickness of treads can vary from 80mm upwards. Larger treads can be manufactured.

Balustrading

There are various options to provide building regulations standard guarding. A glass wall can be erected alongside the staircase, or other balustrade designs can be incorporated.