Hello,
Thank you very much for your question!
I was able to quickly reproduce the issue. After some research, here is my explanation:
- The landing is a separated part, having 6 "faces".
- The flights will not include any part of the landing
Based on the 2 rules above:
- The first flight has 15 risers, the second flight has 4 risers. The landing has 1 riser
- The first flight has 15 treads, the second flight has 4 treads. Altogether, the 2 flights have 19 treads.
But based on local regulation, there might be different ways to categorize them.
I'm interested in your opinion about this!
Best regards,
Minh
Minh Nguyen
Technical Support Engineer
GRAPHISOFT