the stairs are 9 runs of 10" over a rise of 7.5" but they are in code in width but seem to bouncy. they are made from no.1 2x10 so the meat left in is about three inches {should have used 2x12?}. possible chance for post on sono tube at mid span but i worry about not frost protecting the base the foot of stair lands on . decking on tread is 3 2x4s. input thanks
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