Q: I built a large deck with nine posts as a foundation. My problem is that it vibrates when anyone walks on it — even the dog! How do I reinforce it so there is no vibration?

– Mick, Sunbury, PA

A: Tom Silva replies: It sounds like the floor joists are spanning too great a distance. The easiest way to correct the problem is to install a support beam and posts under the joists to cut the span in half. I would use the one-to-one ratio for sizing a beam and spacing the posts, i.e. a ten-foot span needs two 2x10s.
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