Staircases
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I have been fighting with getting staircases, drawn correctly. For example my current project needs a staircase that is 492" (41') but there is no way I can make it in one run, so I divide it into 4 or 5 flights, back to back.
Well as it ends up using the calculations for the 41 foot run, don't work in fewer rises, It ends up being too long or too short. Any stairmaking experts in here?
I am guessing I am overthinking then process, so any tips would be greatly appreciated! -
Imagine you made a single flight of 41' [492"] with an absolute maximum riser of 7" you'd get 71 risers.
Assuming you want flights of no more that 16 per flight that gives 4.4375 flights - or 4 at 16r and 1 at 7r.
If they were to be 8r each that's 8 at 8r and 1 at 7r.
Reverse engineering it... If you want all of your flights to be the same rise then let's go for 9 flights with 8 risers each.
That's 72 risers in total so 492 / 72 = 6.8333333333333" per riser...
If you want an absolute maximum riser height of other than 7" adjust your figures accordingly - e.g. for 8" it'd be something like 8 flights at 8 risers each 492 / 64 = 7.6875" per riser - perhaps too much so adjust the number of risers upwards...
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It's no more than a standard stair with the landing expanded as one of the treads. My guess is your are not " dropping " the stringer to equalize the risers from top to bottom, they are usually not allowed to vary by x which I think is about 1/16.
Just design a standard stair and find out where you are making the error. Try to use a story pole to make the layout of the risers easy on your self without all the math, that is use SU line divide function to establish a ref. FYI Rule of thumb for the run is ( 2x rise) + ( 1x run) = 25 ± 1
When all else fails post your model if you can
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