Ditra & Rapid Set?

[The Legend; Phil Hobson RIP]

I just realised Ditra/Dural should not be used with tiles less than 50mmx50mm. Just so I don't give out wrong info.

 

[beanz]

No mention of having to use anything heavy to remove air on the videos!?! Hopefully my weight over the trowel will be enough, even though i'm definitely no heavyweight lol!

 

[jonnyc]

also ditra not guaranteed if you have an adhesive bed over 10mm. you could havea 50 mm thick stone and 5 mm adhesive and thats ok !!!
20mm stone with 11mm bed no good!!
this is not the case with dural which is why i used it few years ago on specific job with 40mm antique stone up birmingham . they guarantte any bed thickness .
problem was the mat debonded from mesh .manufacture fault

 

[Dougs Third Go]

I just realised Ditra/Dural should not be used with tiles less than 50mmx50mm. Just so I don't give out wrong info.

is that for point loading issues Phil?

 

[jonnyc]

another common misunderstanding is that ditra is guaranteed on plywood over water heat pipes between joists. this used to be the case until about 18 months ago when schluter changed their stance on this

 

[Peter]

also ditra not guaranteed if you have an adhesive bed over 10mm. you could havea 50 mm thick stone and 5 mm adhesive and thats ok !!!
20mm stone with 11mm bed no good!!
this is not the case with dural which is why i used it few years ago on specific job with 40mm antique stone up birmingham . they guarantte any bed thickness .
problem was the mat debonded from mesh .manufacture fault

Interesting, is that including the squares being filled? Pretty sure you wouldn't tile a stone floor without a 10mm bed here and there.

 

[The Legend; Phil Hobson RIP]

is that for point loading issues Phil?

Sorry Doug, yes point loading

 

[jonnyc]

Good point wingn .but I think it must refer to thickness of bed on top of highest point of ditra .

 

[beanz]

I think it's safe to say I need practice (and to get a roller)... It was like trying to tile a small mountain range today lol!?!

 

[One Day]

Why the need to use Ditra here? Have I missed something? Is heat involved?
Surely a physical movement joint between the different substrates is the belt and braces way?

 

[beanz]

There are heating pipes, for the rads, running down the centre of the hall, but it was purely for the movement. What would you have suggested? Not sure what you mean by a physical movement joint!?! If you mean an expansion gap/trim, the customer wasn't going to go for that.

 

[One Day]

Can't do any harm I suppose then. I just see Ditra used a lot where expansion and movement joints should be and where inadequate or no floor strengthening has been done.
It gets used as a "cover-all" solution sometimes.
A brilliant product - don't get me wrong, and I'd choose it over the poor-relation competitors anyday.

Example - I've seen a number of floors like this - 1/2 concrete 1/2 timber where the movement was so great even Ditra failed to cope.
A physical expansion joint was the only solution but as you say - customers won't go for it and if we insist, then the job goes to someone else!

 

[beanz]

The crack in the screed wasn't wide, so im sure it'll be fine. I've yet to do a domestic job where they'd accept an expansion joint, even on long runs. :-/

 

[SR Tiling]

Yes no problem

 

[Jeff the tiler]

I have always used rapid set with out any issues, and with Doug reference standard set.