Building new stairs, good step height and length? HELP,

[50talshusBlg]

Hello!

We are building a new indoor staircase.
I initially planned for a step height of 18.3cm and tread depth of 25cm plus a 2.5cm nosing. (14 treads, 15 risers)

BUT unfortunately, I miscalculated :banghead: when we cut the side pieces, so now we have a step height of 19.6cm and tread depth of 24.1cm plus nosing.

The height from floor to floor is 274.5cm, the length of the staircase is 3.14 (I had space for up to 3.5 meters)
There will be 13 treads in the staircase. 14 risers. Width about 110cm.

What do you think, can this work? Or should we cut new side pieces... (We're using glue-laminated beams,)

 

[larsbj]

In school, we were taught that one step length plus two step heights should be between 580-650 mm for the staircase to be comfortable.

Sent from my MB525 using Byggahus

 

[Marlen Eskilsson]

Here are tips on how a good staircase should be designed:
https://www.byggahus.se/renovera/trappan-bade-smycke-och-nodvandigt-ont

The tread depth should be at least 250 mm on the line of travel. Many architects use a rule of thumb for calculating the comfort of stairs: 2 riser heights + tread depth = 630 mm. The formula shows that if you choose a larger tread depth, you should decrease the riser height to make a comfortable staircase. However, the riser height should never exceed 200 mm.
Architect Lars Einar Eriksson created his own ”comfort curve” for stairs in 1957, which is still used in architectural offices today. He measured riser height and tread depth on stairs he found comfortable while building experimental stairs. On this curve, you can see that with a tread depth of 250, the most comfortable riser height is 170 mm. The curve applies to straight stairs in public environments.

 

[50talshusBlg]

Thanks for the tips.
If you use Larsbjs' formula, it should work, right? one step length = 241 plus 2 heights 196 = 633,

But then I read somewhere that a step height around 17cm is good and treads that are 25cm wide are good.

An indoor staircase should never have a step height higher than 20cm, but if it's very close to 20cm, does it feel like very high steps?