We have moved in to a house built in 1989. All the floors seem to be bouncy all over the house. The floor joists are 2" by 8" 600mm apart. The flooring is some form of Chipboard P5 22mm nailed to the joists at 50mm intervals. The pervious owner seems to of tried to fix the problem by adding counter beams in the floor below which are against the plasterboard and not the joists so they look to do nothing. https://ibb.co/gSTxy3j https://ibb.co/2kLXHC4 Is there a simple solution to eliminate the bounce? It's bouncing at the centre of the rooms. Two worst rooms are 5m by 7m wide. So large spans. With the joists running the 5m direction. I'm planning on removing the P5 and replacing with pine 9" T&G boards. Is there a simple solution such as bolting additional joists to the current joists. Bolting steels to the joist and flooring? Putting Ply board over the joists before the pine boards? This wasn't flagged in the structural survey so I'm guessing it's not a structural problem. It's not something I've come across in older houses. We can't place ornaments in display units as they bounce right out when someone walks from one side to the other. I can't see any damage or cutouts.