I think my house is about 1oo years old, I have lived in it for 15 years and just in the last year the wood floor has started to sag or bouncy where the boards meet. I thought it was in the traffic area, but it's in other areas too.
closed as unclear what you're asking by Tester101 Jan 10 '14 at 11:56
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Most houses built 100 years ago use wooden posts or hollow iron pipes to carry the weight of the main support beam. Over time the columns rust or rot usually at the bottom. Many were not set on footings, but on a large flat rock that was later buried in dirt. Inspect the posts for evidence of rust. Tapping lightly with a screwdriver may produce a difference in tone where the post is thinner. Poking wooden posts with a screwdriver may show evidence of dryrot or insect damage. Any posts that are damaged must be replaced.