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  1. Finish Carpentry
    the picture is a 36" staircase. I plan to use the same design for a 40" staircase using the same Simpsons strong tie brackets or notched sister stringer. this seems to be in keeping with 2015 IRC if I use 3 1/2" thick x 11 1/2" deep treads. Last year the design plan bumped with a center stringer...
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