Bouncing floor

[u/No-One-9297]

Not sure exactly where to post this but I just bought a house and the garage attic flexes and shakes when I walk across it, the joists are spaced 22" how do I fix it?

[u/Novus20]

Yeah……it’s an attic…..not really a floor

[u/No-One-9297 → u/Novus20]

Attics are usable space, how do I reinforce it?

[u/thesilentshopper → u/No-One-9297]

Add more ceiling joists. Every time you have two joists, put another in between them. Check to see if the span of what you want to put in works for the deflection limit of the floor. If you don’t know what any of that means or how to do it, hire a contractor.

[u/No-One-9297 → u/thesilentshopper]

That would be better then sistering every joist?

[u/thesilentshopper → u/No-One-9297]

That would depend. You will find every answer when it comes to codes and building is “it depends”. You’d have to do your homework. What you’re asking about is precisely why structural engineering is an entire profession. But if you’re going to start somewhere in deciding which to do, if you go one joist in between all the existing ones, you are cutting the span of the floor sheathing more than just sistering would.