Metal Stair Stringers – Trio Australia

Check with your local council regarding any compliance requirements. It is recommended that a structural engineer also be consulted.
Calculate the number of steps required. Measure the vertical height from the finished level of the landing to the ground. Divide the height by 175, round off to the nearest whole number and subtract 1.For example: H = 500 ÷ 175 = 2.85 (3) – 1 = 2 step stringer.

Note: The stringers are engineered to provide arise height of 175mm and accommodate treads of 250mm in depth and up to 1000mm in width.

To determine how far from the vertical surface the stringer will protrude, multiply the number of steps by 250 and then minus 175. This will give you the centre point of the stringer foot (base) to concrete it in place (see A in diagram for calculation).
Position the top mounting bracket of one stringer on the vertical support so that the height difference between the top of the landing and the top of the tread to be used is 175mm (see B in diagram). Mark out bolt positions, drill holes and bolt bracket onto support. Repeat procedure to position the second stringer. Be mindful that the maximum tread width must not exceed 1000mm.
Concrete each stringer post into position. NB: To comply with the current Building Code of Australia, the stringer rise must be consistent, including the first step and last step up to the landing. The ground level may need to be built up or excavated to achieve this. Allow concrete to fully set before fixing treads into position.

One set of stair stringers, size as determined by number of steps required.
Four M12 bolts and nuts (or choose a fixing applicable to your job), length sufficient to cover the thickness of the top mounting bracket and vertical support to which the mounting brackets will be fixed.
Concrete mix.
The following tools:
- Shovel
- Tape measure and pencil
- Level and string line
- Power drill and 13mm drill bit

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