Thread: My bearers aren't tied down?

Two problems:
1. The flooring in my master bedroom at back of house is bouncy.
2. My room-width 3-door sliding wardrobe built directly against the floor/walls of another room gets jammed for months on end.

My house is 1970s cavity double brick on brick piers.

While crawling around subfloor of master b/r looking for cause of bounciness, I noticed that the bearers are bowing off the piers. I read in some other threads about tying down bearers to piers/stumps. Is there anything wrong with bearers not being tied down and not expecting any big winds?

The bowing is of concern in the room with the jamming wardrobe, because I think this explains the jamming. The bowing is more pronounced here - 3-4cm opposed to 1-2cm elsewhere - and explains why the jamming occurs only now and then. I used to think that the jamming was due to natural expansion/contraction from hot and cold weather. But there was a dry spell recently where the jamming disappeared (and we were able to access all areas of our wardrobe without engaging in contortionist manouvres, but this is another story); I'd have thought that the heat from the dry spell would cause the floor to expand. There doesn't seem to be a pattern to the jamming but I think I'll keep a log from now on.

This room is also the only one where we haven't put the final coats of polish on the floor - laziness has gotten in the way. We've only gotten as far as the Tung Oil seal. Could this be a contributing factor?

BTW, I'm hoping that replacing rotted joists in the Master fixes the bouncing, as mentioned in this thread https://www.woodworkforums.com/f76/subfloor-joist-timber-type-25937.

Thanks for your time and appreciate any suggestions.