Brad Curtis

09:44PM | 01/06/99
Does anyone know a simple (or complex) formula for determining treads and risers for stairs? ie: you know how high the stairs are going to be and you know how long they are on the horizontal. From these measurements, can you figure out how many steps as well as length of tread and height of risers?


12:17PM | 01/13/99
You have waited long enough. First the specs.
Maximum riser height: 7&1/2"
Max. nosing: 1&1/4"
Minimum tread width: 11&1/4"
Min. run width: 10"
Calculate riser height: Measure the distance from your stair footing to your 2nd floor. Divide that number by 7 to get an approximate number of risers.
Round that number to the next highest whole number and divide that figure into the floor height. If the result falls between 6&1/2" and 7&1/2", you have found the riser height. If it is too small then divide by the next smallest whole number.
Now subtract one riser from your first calculation and you now have the number of risers and their height.
This is all laid out using a framing square.

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