NYS Commercial Stair Code: Risers and Treads

[stubing]

Hello
I am designing a metal stair for a commercial application in an 150 year old warehouse.
I would like it be code compliant for general use as a main stair for a 6000sq ft 2nd fl.

I have always used a 7 1/2" riser and 10" tread (Rise x Tread = 75)

2007 NYS Stair Code: 1009.3 Stair treads and risers requires 7" rise and 11" tread
2008 NYS Stair Code: R311.5.3.1 says maximum rise of 8 1/4"

I have an overall rise of 142 1/2"
I can use:
- 21 risers at 6 25/32" ea
- 20 risers at 7 1/8" ea
I would like to use
- 19 risers at 7 1/2" ea...with a 10" clear (11" overall) tread ....is that within code?

Thanks
SV in Kingston NY

[Jerry Peck - Codeman]

[stubing]

Code Man
Thanks for clearing that up, I am on track with the 21 risers.
I might be second guessing myself with the requirement for a mid-way landing
I am operating under the rule: less than a 12' overall rise doesn't not require a landing to break a rolling fall.
Is there a requirement that my staire with a 142 1/2" rise would need a landing?

Thanks

[Jerry Peck - Codeman]