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Old 10-28-2010, 04:09 PM   #1
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stair size


According to my contractor my exterior porch stairs will have 3 risers 7 9/16, and 2 treads 12 3/4 each. I am not happy with the dimensions but he said they are perfect. Any thoughts please? Thank-you.

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Old 10-28-2010, 05:35 PM   #2
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According to my contractor my exterior porch stairs will have 3 risers 7 9/16, and 2 treads 12 3/4 each. I am not happy with the dimensions but he said they are perfect. Any thoughts please? Thank-you.
Are you unhappy about the width of the tread or the length of the tread? The height of the riser is pretty well set unless you want to add another step which would make your rise 5.67 inches which is not to code.

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Old 10-28-2010, 05:40 PM   #3
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I wanted 3 steps with 4 risers. A 12 inch tread is ok but I thought the riser should be lower. He said nothing can be changed because the skirt is already done.
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Old 10-28-2010, 05:46 PM   #4
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Typically rise and run are not to exceed 7 3/4" rise and run is 11". However many people prefer the extra space of the run for sitting or comfort of walking up a deeper run. As long as they are built correctly the numbers are fine.
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Old 10-28-2010, 06:08 PM   #5
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I was taught that the perfect run to rise ratio should add up to 18” or as close as you can get for a comfortable step. We used this primarily in figuring out landscape steps. So a 5 5/8" rise and a 12 " run is pretty close.
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Old 10-28-2010, 06:15 PM   #6
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The rise is 7 and 9/16 so they don't add up correctly.
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Old 10-28-2010, 06:23 PM   #7
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#1 for an exterior stair case one should consider grade. Consider intersecting sidewalks, landscapes, foundation, pairs, etc. You dont want your hardscapes to be thrown off because the stairs are sitting to low or to high. Hope that makes sense. If you have a good contractor or builder doing the work this will and should be considered. To many contractors forget about this detail.
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Old 10-28-2010, 07:40 PM   #8
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stair size


7 1/2 " rise and a 10 " run (not including nosing) is ideal.

rise + run = 17.5
rise * run = 75

Those formulas give two targets to aim for.
As the rise increases, the run should decrease accordingly. And vice versa.

Does the 12 3/4 run include the nosing?
According to the code I am familiar with, the nosing needs to be 3/4" min up to 1 1/4" maximum.
Plug the results into those formulas and see how close you get to the 17.5 and 75 answers. The closer the better.

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