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Originally Posted by Jo-JotheSoundDog
I was always taught 8" rise 10" tread was the ideal but you must measure and do the math before hand. But you want to try to get as close to these numbers as possible. The problem I see with this rule of 18 is a 17" rise with a 1" tread should work according to that description.
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The reciprocal of your example, 1" rise with a 17" tread is a known architectural effect. But in no way was I suggesting the complete and total abandonment of common sense when working with the "rule of 18." :D Like any axiom, it has its limitations. But you made one hell of actor trap with your example. Or possible a nice trophy stand. :D