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Thought about that and suggested it but joiner wasnt happy laying ply onto joists without additional noggins, which he cant do due to the ufh pipe and screed etc. Therefore I thought 22mm chipboard with 18mm ply overboard to ensure floor is solid after all chipboard will have been cut in...

Yeah its like you said defo not my first choice or ideal. The floor flles solid just chipboard but with the chipboard being cut for piping I think the safest plan would be to add correct thickness and type of ply along with a decoupler to ensure the risk of travertine cracking etc is mimimised...

Some sort of Insolation board that pipes and clipped into then are set in a screed.

Hi advice needed before attempting floor. Wet Ufh being installed and current chipboard being cut out in places to allow pipe to be layed. Pipes will be inbetween joists therefore no room for noggings to be inserted, so to ensur strong deflection free floor and am not wanting to take risks. I...

Cheers for the help and glad it went well.

Hi Kev, How did you get on with your job? have similar coming up and had come up with same plan.

No Jay its hallway,kitchen and dining room so no wet areas. Bit of info Wet piped ufh, intention IF bounce free is to, 1.install 22mm t&g chipboard screwed to joists then lay 6mm hardi fixed at 150mm with screws to chipboard and on a 6mm bed of keraflex. 2.lay dural ci+ bedded with keraflex...

Here's an update on the upcoming floor. Spoken to joiner and he has no way of adding noggins between joists because of the ufh pipework so advised not to use sheets of ply as under every joint must be supported. Which makes sense, so if chipboard is used which is obviously 22mm thick and...

Here's an update on the upcoming floor. Spoken to joiner and he has no way of adding noggins between joists because of the ufh pipework so advised not to use sheets of ply as under every joint must be supported. Which makes sense, so if chipboard is used which is obviously 22mm thick and t&g...

Yeah Primer G, think im loosing the plot! Ok before i get more info and speak to joiner tomorrow could you help me out? If floor is deflection free will it make a difference wheither 22mm ply is layed with 2-3mm expansion gap and screw to death up joists or 22mm chipboard layed and screwd to...

Everyone talks about deflection and no more than 3mm per 400mm but how do you accuratly measure it?

Yip fair point. Ive nothing like the experience of you tilers on this fourm so if thats a recomendation im on board. So if using wbp ply straight onto joists it must be 22mm minimum? and its not in wet area its hallway,kitchen and dining room would it still require to be sealed underside and...

Yeah seems very thick. the wet ufh currently is being installed then new 22mm chipboard being layed. Spoke to joiner who is very good and work with alot about replacing chipboard with equivelant ply and he wasnt keen said chipboard gives more strength and is t&g. however would it be best for me...

So if using this method would the heat still transfer through 22mm chipboard+15mm ply and then through a cement board ?

Cheers Rich do you never tile directly onto ply and what thickness would you use if you had choice?

2 things just popped into head, Type of decoupler you use and is it recommended? and do you only use WBP ply thats treated or standard ply do? just help me with thought process. Thanks

So your quite happy to use ply as a sub, take it 15mm minimum and always use a decoupler with travertine wheither ufh is involver or not?

No not this time as no ufh and room was about 5m2 but do if ufh is involved and tiles are porcelain,travertine or another natural stone.

Good advice, Thanks. Would the steps listed be suitable or is cement boards recommended instead of ply? Mapei tech say ply is superb or ixing using there addy and i know 15mm would add strength.Ive been toying over this because i want a strong floor or tiling but heat to be passed through no...

I think they were butted together my mate did the plying. Think I will try strengthening floor and if problem persist put in 2mm gap in boards.:mad2: Was ment to have a 45m2 travertine floor job but this has dented my confidence a tad and am unsure wheither to take job on. Job comming up is...