ᐅ Straight Staircase for a Single-Family Home: Are the Dimensions Correct?
Created on: 23 May 2021 14:08
A
Aracnor
Dear house building community,
We are planning a straight staircase for our single-family house to connect the living-dining-kitchen area with the upper floor. In consultation with the architect, we currently have the following dimensions:
16 risers
Riser height: 18.6cm (7.3 inches)
Tread depth: 27.0cm (10.6 inches)
We found the following terms online:
Comfort rule
Tread depth – riser height = 12
27 – 18.6 = 8.4
Stride rule
2 x riser height + tread depth = about 63 centimeters
2 x 18.6 + 27 = 64.2
Safety rule
Riser height + tread depth = 46 centimeters
18.6 + 27 = 45.6
We roughly meet the stride and safety rules, but it seems we significantly deviate from the comfort rule.
What do you think of these dimensions? Are there any practical experiences you could share?
Thank you very much and best regards,
Peter
We are planning a straight staircase for our single-family house to connect the living-dining-kitchen area with the upper floor. In consultation with the architect, we currently have the following dimensions:
16 risers
Riser height: 18.6cm (7.3 inches)
Tread depth: 27.0cm (10.6 inches)
We found the following terms online:
Comfort rule
Tread depth – riser height = 12
27 – 18.6 = 8.4
Stride rule
2 x riser height + tread depth = about 63 centimeters
2 x 18.6 + 27 = 64.2
Safety rule
Riser height + tread depth = 46 centimeters
18.6 + 27 = 45.6
We roughly meet the stride and safety rules, but it seems we significantly deviate from the comfort rule.
What do you think of these dimensions? Are there any practical experiences you could share?
Thank you very much and best regards,
Peter
H
hanghaus200024 May 2021 09:03Why don't you make a 3cm (1¼ inch) undercut? Then you wouldn't need the 4m (13 ft).
Because the 3cm (1¼ inch) nosing when going downstairs does not really matter and thus makes the tread depth quite small.
Once again, my stair picture... note that only floor heights of 280cm (9 ft 2 in) are considered here.
Comfortable stairs are already more than 4m (13 ft) long.
Once again, my stair picture... note that only floor heights of 280cm (9 ft 2 in) are considered here.
Comfortable stairs are already more than 4m (13 ft) long.
@ypg .. I have to disagree here 😉 .. according to Wikipedia, my understanding, and usage in various CAD programs:
The story height in buildings refers to the vertical distance between the finished floor surface of one story and the finished floor surface of the story above. The story height is the sum of the ceiling height plus the thickness of the floor structure above.
==> Stair height = story height; you just have to remember not to consider only the ceiling height.
EDIT: Nice image to illustrate
The story height in buildings refers to the vertical distance between the finished floor surface of one story and the finished floor surface of the story above. The story height is the sum of the ceiling height plus the thickness of the floor structure above.
==> Stair height = story height; you just have to remember not to consider only the ceiling height.
EDIT: Nice image to illustrate
B
BauFamily24 May 2021 22:37@Aracnor: I found the calculator you used. The comfort formula is calculated by subtracting the riser height from the tread depth. Ideally, the result should be 12 cm (5 inches). Therefore, with a tread depth of 27 cm (11 inches), the riser height should be "only" 15 cm (6 inches). This means that for a floor height of 2.97 m (9.7 ft), you need 20 steps, making the staircase 5.40 m (17.7 ft) deep. Conclusion: I think this comfort formula is too strict for the average person 🙂
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