Hi Jens,

Before I send you the plans for this stair there are several points that might need adjusting.

– step and riser housings are 30mm deep this is generally too deep and 15mm would be better

– no step and riser penetration into the posts, this should be set to the same as the string penetration

– no riser to upper step penetration this should be set to around 10mm

– first left string flush to the first step nosing, the stringer should be put forward so that the step housing is not exposed

– first handrail is 40mm thick like the stringers but the 2nd is 50mm thick, is this done on purpose?

Some other suggestions:

– Risers are sitting on the steps, they usually go behind the step and are screwed from behind

– Step housings around the post are not optimised for machining, it’s better to move steps so that the housings are fully contained on one face of the post or stringer.

– riser N° 12 housing not contained in the stringer, the stringer should be eased to allow the housing to be contained within the stringer width.

– Right stringers are curved, in this stair it would be better to have them straight.

One other points that are unclear for me :

–  step 13 is straight with no landing step with the last riser half notched into the post. It would be better to have a landing step and have the last riser notched into the stringer. 

– First step is 200mm thick, is this an error?

– handrails are unusually wide at 120mm, is this really what you want?

– strings and handrails penetrate 30mm into the posts, is there a reason for this. I would suggest that you cut them flush and use a dowel and bolt assembly.

I attach your stair with these modifications for your appreciation.

Best regards,

Ness