View the thread, titled "How to tile on 3 different substrates??" which is posted in British & UK Tiling Forum on UK Plumbers Forums.

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i think the best way to tackle this floor without raising your floor height.imo take up the exhisting timber floor boards and chipboard. strenghten floor joists where needed re do with 25mm marine ply but where it meets the concrete chisel the concrete where it protrudes into the plywood area so the ply sits flush with the concrete(if you get wat i mean) you will have to screw and plug the ply to the concrete.then you will be able to create a clean joint along the length of the room you will only have to install one movement joint..hope this helps.. i wouldnt attempt to put an uncoupling membrane over this substrate..:thumbsdown:....:thumbsup:
 
Customer is pretty adament that he doesn't want the expansion joint

Will this Watec Product do the job or is there another way round it?

Thanks
 
If you can make sure 100% there is no deflection between timber and concrete then Watec will uncouple the whole floor.. as it is laid loose and not stuck down.. so different expansion issues do not effect it, but it is very pricey.
 
appart from going over the whole floor with 25mm ply no.. expantion joints dont look that bad if there installed properly you can get them to match the grout..sorry but ive never heard of watec?????:rolleyes5:
 
Watec..

30-metres-of-watec-2e--gutjahr-indortec-matting.jpg


Watec 2e indoor Matting – gUtJaHR
The Watec 2E Indoor Matting reinforced decoupling matting does not need
an adhesive bond to substrate and allows for damage free tiling on critical
substrates such as wood, asphalt, cracked concrete floors, hard PVC or substrates
made of different kinds of material.
Watec 2E Indoor Matting saves time, labour
and materials and is ideal for problem substrates such as chipboard. The mesh side
is placed uppermost. Designed as a floating system it offers a variety of time and
cost saving advantages:
l Secure: 100% guaranteed decoupling
l Fast: Less preparation of the substrate, up to 75% quicker = less waiting
time to continue work
l Cost saving: Less adhesive and material for preparing the substrate needed
and tiles can be laid directly onto contaminated bases/hard PVC/
linoleum without disposing of old floor coverings

http://www.trimlineinnovation.co.uk...ment_Joints_Edgings_and_Movement_Mattings.pdf
 
The watec looks interesting. Ditra wouldn't cope with the various substrates, not sure about the watec though.
If I've read that right, you don't anchor the watec to the substrate? I think I'd go with Andy's idea, make the whole floor the same substrate, I'd prefer if was a cement board of some kind though.
 

Reply to the thread, titled "How to tile on 3 different substrates??" which is posted in British & UK Tiling Forum on Electricians Forums.

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