Thought my deck stairs were solid until a 240 lb buddy put his foot through step three

Mia Baker · 2026-09-30T07:10:02.356084+00:00

Built the stairs off my back door in April with pressure treated 2x10s and spaced the stringers 24 inches apart. Last weekend my friend Dan was carrying a cooler down and his heel went clean through the tread right at the knot, dropped him about a foot onto the landing. Pulled the boards and found two more soft spots I never caught, so I'm redoing the whole run at 16 inches on center with 2x12s. Did I mess up the wood or just get lazy on the spacing?

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Thought my deck stairs were solid until a 240 lb buddy put his foot through step three | Bad Build Review - Rigidtalk