Tiling over a wooden floor

[Joana]

I understand that. The floors themselves are reasonably solid, not a problem. It's the joists that seem to make the floor a bit bouncy. If we tile on these floors with hardie board , will it crack eventually ? Underfloor reinforcement for the joists would be almost impossible as there is very little space and what we have is already required for a 4" waste pipe through the floors , pipe work, insulation , inspection hatches and so on.

 

[Joana]

We will have another look tomorrow, it's a bit of a nightmare down there ...might be able to get something really small in. Like half bricks and mortar to go just in below the joist

 

[Julian 'Farmer' Bonsall]

Joana sounds a similar construction to part of my property and all the friendly spiders. I strengthened the joists from above with extra cross braces, some steel straps (some areas were cut for the brick access ways and some pipe work) and a 25mm ply on top glued and screwed. The floor movements were very bouncy, and noisy in the past.
[DIy'er]

 

[Dumbo]

Just to reiterate and to make it clear if your floor bounces it will fail no matter what adhesive you use .