No. of Recommendations: 1
Much also depends on what kind of wood you have.

I replaced a wooden stairs a few years ago. It was abt 15 years old, made of treated lumber.

Closer inspection revealed the lumber was fine. But it was held together with screws that had corroded away.

Redwood or cedar must last a long time too. But if made of soft wood, five years might be about as much as you can expect. Even if not in contact with the ground, dry rot gets 'em.
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