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Carriages should be layed out using a consistent rise to run ratio to prevent tripping. There are several "rules of thumb" which will help determine a proper ratio to make a stair comfortable to use. An easy one is the Rule of 17: When measured in inches: Tread + Rise approx.= 17. For example: for an 8" riser, use a 9" tread, because: 8"+ 9" = 17" ................
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