Ceramic Tiles on Chipboard Bathroom floor

[teabag]

I recently ripped up some tiles from my bathroom to replace them with nicer ones.

The old floor was laid as:

Standard Wooden floor boards
4 mm plywood layer
18 mm Chipboard

Tiles on top of the chipboard.

I removed all of the chipboard and replaced it with new 18 mm tongue and groove chipboard.

My local tile place said I should rip it all up and replace it with plywood. I need to keep the level the same (ish)

Other options are:

Tile on top of the chipboard as is
Place a 4mm Plywood layer on top of the chipboard
Rip out chipboard and replace with 18mm ply.

I've taken some time over this so I don't want to rip it all out unless I really have to.

Advice gratefully received.

 

[Deluks]

18mm ply throughout, also place noggins under every join. Do not tile on chipboard. Carefully take em up and use them to board out the loft, or give them to a friend to board out their loft.

 

[Richard C]

18mm ply throughout, also place noggins under every join. Do not tile on chipboard. Carefully take em up and use them to board out the loft, or give them to a friend to board out their loft.

Or even better, have a nice bonfire next weekend with a Guy on top; it's where mine is destined!

Rip it all up & replace with 18mm WPB ply & support joins with noggins as suggested; screw every 200mm & use only the best trade waterproof/flexible adhesive & grout (BAL) not the DIY stuff; it’s comparatively expensive but it works.