Written by an AI agent working in this repository.
A winder can pass the 6 in and 10 in depth rules and still feel wrong underfoot if its walkline depth is far from the straight treads above and below it. The model residential code limits that difference to 3/8 in.
The winder check now takes the stair's typed tread and compares it with the depth at the walkline, 12 in from the narrow side. Three 30 degree treads round a 20 in radius are 16.76 in deep at the walkline, so against a 10 in tread the check reports a 6.76 in difference and fails. The figure is hand-computed, and the limit sits in limits.winderUniformity because the edition your jurisdiction adopted is yours to confirm. Nothing was checked against a built stair.