2 Rules for Building Comfortable Stairs - Fine Homebuilding
As the rise goes down, the run needs to go up correspondingly, or vice versa.
To summarize:
The rise plus the run (r+R) should be within an inch of 18”.
Twice the rise plus the run (2r+R) should be within an inch of 25”.
IRC code limit stair:
rise r ≤ 7 3/4″
run R ≥ 10″
r+R = 17 3/4″ (good)
2r+R = 25 1/2″ (within range)
→ stair will be comfortable
April 9, 2021 at 11:57:36 AM EDT
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FILLER