What Base for Encaustic Floor Tiles On Suspended Floor?

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My wife wants the hall carpet replacing with encaustic tiles (house is late Victorian). The area is an L-shape about 3 metres long on each leg. The floor is a suspended one with floorboards, which are in reasonable condition.
What base is required under this sort of tiling to allow for expansion etc, bearing in mind that there are 4 doors opening off it and I want to minimise any increase in the finished height compared to the other rooms, which are mainly carpeted? I'm thinking something like marine ply?
Is this tiling really practical on a suspended wooden floor anyway?
 
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For overboarding you will be advised 12mm wbp ply fixed at 200mm centres.You would need to ensure all the boards are well fixed first.

Have tiled many suspended floors with no probs,it's down to the prep work.

I have used 6mm backers before but over chipboard not floorboards,worked ok though.

Remember to use a flexi adhesive and grout.
 
Thanks, is WBP ply what used to be called marine ply, i.e. water resistant?
And could you explain 6mm backers please?
 
Exterior grade plywood (WBP - Weather and Boil Proof) is specially made using a water-resistant adhesive to withstand a certain amount of moisture and can be used for outdoor constructions - sheds etc. and is sometimes used as a cladding material, particularly for insert panels under windows. WBP does require additional protection (paint or varnish) to protect the outer veneer.


http://www.pureadhesion.co.uk/product/172/10-x-hardibacker-250-(6mm-floors)/
 
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Thanks.Last question-based on using 12mm WBP ply and 10mm tiles, roughly how deep would the adhesive bed be? Trying to get an idea of the surface level of the titles. Going to be 22mm plus adhesive, over an inch then?
 
If you use a 10mm u notch then depending on the pressure you apply when fitting you should end up with about 3-4mm bed depth.
 
Thanks so 26mm -ish-I thought min 1 inch so wasn't far out. That's only about half an inch more than existing carpet, so it's do-able.
She's going to have to start saving up though...
 

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