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Question DetailsAsked on 6/29/2017

Basement ceiling flexing when someone jumping on the floor above

I have a finished basement with a ceiling that is Sheetrock. I have have noticed that if someone is jumping on the floor above you can feel the basement ceiling slightly flexing if you are placing your hands on the ceiling. There are no cracks in the basement ceiling and you can't see the flexing by looking at it. The only way you know it's flexing is by the feel. I would assume that there would be some form of of the joists flexing if there is weight being jumped on from the floor above. But I just wanted to make sure that this is normal and not something that I should worry about

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1 Answer


Not at all unusual, especially under a large room (living room, family room) to feel or sometimes even see (especially if looking along the width/length of the ceiling from an eye level close to it) slight floor joist movement if your kangaroo is jumping around upstairs.

If you SEE significant movement may indicate joists with a lot of slack in the subfloor fastenings or maybe on the undersized side. But unless you are seeing drywall ceiling cracking or hearing wood cracking or nail pulling screeching sounds (as opposed to just some wood creaking) or visible significant sagging when it is just walked over by a normal adult, I would not worry - certainly not with the non-visible movement you described.

This assumes your floor is wood framed - concrete floor should not have noticeable or detectable movement under load like that.

Answered 3 years ago by LCD

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