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To calculate if the steps will be within the Building Codes specs: 2 times the step riser height + one tread depth equals between 24 and 25 in inches (60.96cm and 63.5cm). example: (2 x 7.5") + 10 = 25 (2 x 19.05cm + 10 = 48.1cm)
Yes, tread depth includes nosing overhang. There is also a proportion from tread to riser. For me, the most common is 7” riser and 11” tread. As the riser decreases, the tread should increase for a “comfortable” use. That’s why the steps in front of the Washington Monument has 20” treads and 3” risers.
14 stairs = 17.9cm rise, 27.0 depth, 3.78m run; For some reason it doesn't specify anything about tread projection. Also you can see it results in quite big differences in run; if you take the 11 stairs example and divide it by the desired 2.1m run, you get 19.1cm tread depth, which seems better than a shorter staircase.
The greatest tread depth within any flight of stairs shall not exceed the smallest by more than d inch (9.5 mm). Winder treads shall have a minimum tread depth equal to the tread depth of the straight run portion of the stairs measured as above at a point 12 inches (305) mm from the side where the treads are narrower.
The Code requires a tread depth of no less than 9”. (See ICC R311.7.5.2.). However, it also states that the maximum difference between “any tread” can’t be more than 3/8”. Btw, risers can’t be more than 8”. (R311.7.5.1.) Ditto on the 3/8” diff. Interesting fact. There is a recommended “comfort range” of riser height to tread ...
Stair tread depths shall be 11 inches (279 mm) minimum. The riser height shall be measured vertically between the leading edges of adjacent treads. The tread depth shall be measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the tread's leading edge.
OSHA 1910.25(c)(3) requires standard stairs to have a minimum tread depth of 9.5 inches (24 cm). IBC 1011.5.2 requires that stair treads be 11 inches (279mm) minimum measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the treads leading edge.
Can any builders tell me how far their stair nosing overhangs? I've read that 1.25" is common. I'm having my stairs rebuilt and the overhang will affect the location of the bottom stair.
Worst case is a rise of 8 1/4" or so for one step (tread) is fine. I would make the tread width (the run) anywhere from 11"-13"- less than that feels tight and more than that can be awkward- like you need to stretch your step or take two steps on it.
It is not possible to use a solid stringer mid-tread, so where the code addresses increased span allowance for use of solid stringers, there is a presumption that the middle stringers (if any) are cut. Your 48" width will need two cut stringers, because anything exceeding 36" width need max stringer spacing of 18"OC. There is no support or span ...