Marble over hot water ufh

[sibs]

Here's one for you all....

Went to look at a job today to tile 32 sqm "cuppocino marble" over four rooms. What they have done is screw batons to the floor which is concrete so that they can run the hot water system between the batons. The batons are aprox 4" by 3/4 or 1" or there abouts. He has 18mm chip board which he is going to screw to the batons. The tiles are white and 600 by 600mm. What are the issues with chip board? I have told him to get ply but can't quite remember what it is about chip board that makes it unsuitable. Do I need a de coupling membrane or just a very flexible adhesive? I have recommended a de coupling membrane - am I right? Has anyone heard of cuppocino marble? is it a good quality marble? Or is it just a name?
Any help/advice as to how best to proceed with this would be most appreciated

 

[wetdec]

Cappucino marble is quite brittle but it may just be a name they are using. How thick is it ??

He will need 18mm ply screwed every 6 inches chipboard will have to much flex in it then a layer of durabase ci uncoupling mat. The battern would be good at 350 centres and at any point where they are floating off the floor wedged and gripfilled.,

Depending how big your run is it may need expansions, take a look at this post http://www.tilersforums.com/tiling-forum/14652-expansion-joint-help.html

If the chipboard is down then 12mm ply overboarded opposite direction to chipboard


Hope this helps


tiler

..

 

[DHTiling]

Hi tina..

Is there any insulation within the floor....a lot of heat loss there.....as for chipboard...i would use ply as well...chipbord not really stable enough IMO....And yes i would use an uncoupling membrane ..something like durebase ci or schluters ditra...

If you can come back with a few more details on the stone and method of fixing for the battens then we can advise better....

 

[sibs]

Great answers already yes there are insulating boards between the batons. The batons are screwed to the floor about 25cm or so apart - I certainly thought they were close enough together so as to provice a good base. He plans to do this throughout. The two biggest rooms are around 10 and a half sqm each room so I was wondering if I needed a movement joint on the threshhold to each room. Basically it is a diningroom hallway kitchen and downstairs lav going off the kitchen all to be tiled throughout... 32 sqm in all.The tiles looked like they were 8 or 9 mm thick... I recommended that he changed the chipboard for ply and to have a de coupling membrane. Other than that I take it that its a white flexi adhesive and seal with an inpregnator sealer before and after grouting. In light of the recent thread about natural stone is there anything more I need to know?

 

[wetdec]

I wouldnt think Its not going to need sealing first m8 if its polished. Remember its white flexible adhesive and they will need 3mm min spacing

250 centres is good but make sure they are packed where needed or the extra becomes a waste of time.




tiler

..

 

[sibs]

Well its kind of in his hands regarding the preparation of the room I just hope he takes my advice with regard to the ply because he had already bought the chip board - bloody great big sheets of it!

 

[Daz]

Aside from the prepping, it may be worth ensuring that you have a labourer too. 600 x 600 x 10mm marble isn't going to be light :mad2:. I was knackered after doing a bathroom with 600 x 300's.

 

[White Room]

Hope your've a good cutter for them aswell Tina

 

[sibs]

Good point captain have been hanging 600 by 300 ceramics and they're heavy enough!
Whitebeam do you think my marcist blade on my master tiler will do the job?

 

[DHTiling]

Good point captain have been hanging 600 by 300 ceramics and they're heavy enough!
Whitebeam do you think my marcist blade on my master tiler will do the job?

I very much doubt it tina......

Can one of you kind gentlemen in tina's area borrow her a rail cutter suitable for 600x600's.....

If not tina i think you need to hire or invest...

 

[sibs]

Thanks Dave although its not the news I wanted to hear with the prospect of having to fork out for a new gearbox for my van :mad2: I will look at hiring one if I get the job

 

[Spud]

i was a little confused reading your original post you say the tiles are white and also that they are cuppocino mable and 60 x 60 by 10mm thick. all the cuppocino marble i have seen has been biege in colour and i have never seen 60cm x 60cm marble tile in 10mm thickness normally tiles that size made of marble are 20mm thick did the customer show you a sample or did they tell you what they are having ?

 

[sibs]

Hi gary the tiler I only got a quick look at the marble as it had a lot of stuff on top of it but it looked pretty big but they could have been 450 but they didn't look that thick to me I guess they could have been slightly thicker but not by much.
The colour was white with dark veins running through... I had just driven 3 hrs from london and my gear box was not well so perhaps I was a bit distracted plus the place was in absolute chaos. I asked them what type of marble it was and they said they were told it was cappucino marble