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We've owned this house for about 2.5 years. All hardwood floors upstairs. We put a new bedroom set (considerably larger and heavier than before) in one upstairs room a couple of months ago.

In the past week, I've noticed a patch about 2'x2' that suddenly creaks and sinks slightly when you step on it. This is definitely a new thing.

The room is close to the upstairs bathroom, but none of the pipes really run near it. We have a pull-up bar in a door frame below that area, but it's been there for a year or so.

The patch is not particularly near the exterior walls or structural walls.

I am mystified. What could cause such a sudden change?

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  • Do you have photos of the area? Can you visualize what support structure is immediately below the affected area? How much movement are you indicating. A "soft" spot or creak can be felt at as little movement at 1/64th of an inch.
    – BrownRedHawk
    Commented Dec 15, 2016 at 16:16
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    What kind of hardwood floor? Floating? Thickness? Underlayment?
    – DMoore
    Commented Dec 15, 2016 at 16:49

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Most obvious are dry rot, termites, and moisture damage. It could be a very slow leak because even if the pipe is further away--water often goes mysteries ways.

Or maybe as simple as a fastener settling.

I would just keep an eye on it and see what happens next.

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