ᐅ Stair Planning: Tread Width

Created on: 6 Jan 2017 10:41
T
TobiEFH
T
TobiEFH
6 Jan 2017 10:41
Hello dear forum,

I will be installing LED strips (running parallel to the staircase) before plastering, which will then be plastered over. Therefore, I am currently planning the staircase and would really appreciate your support.

We have a two-flight staircase with opposite directions and an intermediate landing, made of steel and wood, in our newly built single-family house.

Based on the stairwell dimensions and the landing height (which should also serve as the window sill), the following data apply to the upper part of the staircase:
Riser height: 18.64 cm (7.34 inches)
Tread depth: 24.89 cm (9.8 inches)
Stair angle: 36.83°
Step length (going): 62.17 cm (24.47 inches)

For the lower part, the riser height is 18.1 cm (7.13 inches) due to the landing height.

What is the optimal tread depth for the lower part to achieve a "uniform" staircase?

Many thanks in advance for your help.

Regards,
Tobi
S
subsb74
7 Jan 2017 13:20
62.17 cm (24.5 inches) - (2 x 18.1 cm (7.1 inches)) = 25.97 cm (10.2 inches)
M
Michael86bay
7 Jan 2017 19:46
Thank you.
So it’s better to keep the same tread depth, even if the riser height varies?
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subsb74
7 Jan 2017 20:47
Yes. The slope is determined by the landing height anyway. I assume that is fixed, or could it still be adjusted? Personally, I would prefer a consistent slope. A half-centimeter (0.2 inch) difference in the slope is more than you might expect. With the landing and two separate flights, that would still be somewhat acceptable. A 5mm (0.2 inch) difference within a single-flight staircase is enough to cause someone to trip and fall; you wouldn’t be the first.