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Stair Tread Thickness


If I cut 16 runs at 7 1/2", wouldn't my very first step be 9"?


If your stair treads are made from 2x4's or 2x6's, they are 1 1/2" thick. Cut 1 1/2" (or whatever tread thickness you have) off the bottom of the stair stringer and install the top step of the stringer down 9" (in your case) from the finished floor. When you put the stair treads on, you are adding 1 1/2" to the bottom rise of 5" which equals 7 1/2" and subtracting 1 1/2" to the top rise of 9" which equals 7 1/2", making all the stair rises the same height. See my article How to Cut a Stair Stringer for more information.


(Ask Dave) (About Dave)

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