Tiling question (moved from Information)

[Robert James Fischer]

Hi - I'm having a tiler lay floor tiles in an upstairs bathroom. There is already a layer of chipboard (waterproof type)on the floor and on top of that a carpenter has laid plywood (can't remember how thick) He has done a neat job screwing it down well.

My tiler has quoted £72 to supply and fit Durabase.

He has also quoted £172 to lay the tiles we have supplied.

I have seen a few comments about 'Durabase' and was hoping someone could say whether this will be solid enough - The previous tiles were solid enough over a 10 year period but I can't remember what the previous tiler used to secure the tiles.

Thanks...

 

[PrenticeBoyofDerry]

If the floor is sound/stable without movement, there would be no need for durabase matting.
Regrettably chipboard floors are not that good and have a history of sagging. But providing the ply substrate is 18mm.