Quartz and under floor heating

[Flintstone]

Alright chaps,

Had a call about a job which I have to quote,
Not got the full info until tonight but what I have is, 35 sq m, multi room, quartz. Also there's ufh wants fitting first, they apparently have all the materials supplied by tile giant. I'm getting more info tonight. New build onto concrete.
Question is, I don't recall ever fitting quartz before so I know about the adhesive but does this require a decoupler, and where should I be with the pricing for laying based on I would be in at £30 per m for porcelain unless they were really large

 

[Flintstone]

Having just looked on tile giant website, most of the quartz tiles are around £70 per meter

 

[Dumbo]

Price as stone got to be sealed and got to be wet cut

 

[Old Mod]

Check suitability of Quartz for UFH!
A lot isn't.
Not done a lot myself and never with ufh.
If memory serves, only Gulf Stone is suitable pretty much.
And a two part adhesive, no water.
Happy to be corrected tho.

 

[Flintstone]

Could be tricky finding out the suitability via tile giant! But that's some good info mate cheers.

 

[Flintstone]

Is quartz any more tricky to cut then say travertine or marble ?

 

[One Day]

Assuming it's man made quartz, it cuts very easily wet. Tile giant is unlikely to be selling quality though, so if I was taking this job I'd want a written confirmation of suitability with ufh.
I've seen way too many dished due to heat.

 

[Qwerty]

Ive done a few quartz jobs, and one was over elec ufh (only 100w). Those tiles were from Tile Giant too. I used Tilemaster rapid Setaflex with their flexible additive over Ditra. Been absolutely fine.
I can't help but feel that some failures are due to cranking heat up on 150w mats (& water ufh) too soon and/ or using incorrect adhesives. Don't get me wrong, some quartz are totally unacceptable for ufh which is why I specced lower wattage with the tile giant tiles.

 

[Flintstone]

Some food for thought here guys, I'll ask them to email me over all the bumf from tile giant and deffinately ask them for some confirmation of suitability. So if it is suitable, would tilemaster crack may suffice? Also, it's a new build, concrete floor, what's the situation with drying times with concrete when considering what there proposing

 

[One Day]

Don't scrimp. Use ditra as it has a vapour management function, meaning you can crack on with a screed which might not be fully dry.

 

[Chalker]

Don't scrimp. Use ditra as it has a vapour management function, meaning you can crack on with a screed which might not be fully dry.

I never understand that? If it's great at vapour management, where is the moisture in the screed going to go?

 

[One Day]

I never understand that? If it's great at vapour management, where is the moisture in the screed going to go?

Been on their courses? Seriously good if you've not been!

Schlüter®-DITRA 25 | Function | Schlüter-Systems - http://www.schluter.co.uk/ditra-25.aspx

"c) Equalisation of vapour pressure
The interconnected air channels between the cavities on the underside of the Schlüter®-DITRA 25 matting remain open. This allows moisture in the substrate to evaporate, therefore neutralising vapour pressure."

 

[One Day]

I assumed it escapes over time at the edges.

 

[Flintstone]

How does that perform its job if there is insulation boards stuck down first as would be with this job

 

[Dumbo]

I have tile giant quartz in my ensuite . Floor build up water ufh (running of heat pump so low temperature) two sheets 12 mm ply crossbonded glued and screwed dual ci matting and stuck the tiles 600 x600 using a c2ft adhesive been down a few years now . No problems

 

[One Day]

I assumed it escapes over time at the edges. Up the skirt

How does that perform its job if there is insulation boards stuck down first as would be with this job

It probably won't! With 10mm insulation boards, I wouldn't bother with any type of membrane. The boards will bridge cracks.

 

[Flintstone]

But what about the expansion and contraction of the ufh ? Does it not need a decoupler directly under the tile ?

 

[One Day]

35sqm, multiroom? I'd say no.

 

[Flintstone]

Cheers, I'll get any more info I can this evening.