Hello Craig,

That’s good. Please let me know if you have any more questions.

Regards, Isaac

Hi Craig,

Yes, in most cases you’ll cut the housings in the stringer at 90° (square to the face of the stringer). That keeps the machining straightforward and consistent.

For the winder section, you can then form the angles on the ends of the risers (and treads if needed) to suit the plan. So the housing stays square, and the component is what carries the angle.

That approach works well because it keeps the stringer stronger (no awkward angled housings removing extra material), and it’s much easier to machine accurately.

Just make sure you’re marking everything from the correct face and referencing your centreline/plan layout carefully. Small errors show up quickly in winders.

Regards, Isaac

Hi Craig,

For a 32 mm stringer, I’d recommend:

• Tread/riser housing depth: around 10–12 mm
• Wedge depth: around 6–8 mm (shallower than the housing)

That keeps enough material in the stringer while still giving a solid joint.

Your 4° pre-cut wedges will work fine. Just glue and don’t overdrive them.

And yes, if wedges weren’t enabled in StairDesigner, it won’t generate cutting files for them. That’s why there is no wedging details in your cutting files.

Thanks, Isaac

Hi Craig,

18mm penetration into a 32mm stringer is quite deep. It leaves very little remaining material, so it’s generally on the risky side unless the stringer is well supported or engineered for it. In most standard timber stair details, you’d aim for shallower cuts to keep more strength in the stringer.

For the wedges, they should be shallower than the tread/riser housings. They only need to lock the joint in place, not match the full depth of the tread penetration. Keeping them shallow helps preserve the strength of the stringer. Note, there was not wedges enabled in your StairDesigner file.

If you’re unsure, it’s safer to reduce the penetration depth rather than push it to the limit.

Regards, Isaac