Ditra or not...

[cam_low]

Quick survey please guys.

100m2 of glazed 60x60 porcs onto 1:4 S&C screed continuing through the house to concrete floors possibly needing SLC.

The cost is spiralling for the customer however I thought in my head I would use ditra for 2 reasons, 1) aiding the moisture release and 2) uncoupling to prevent any cracks under floor stress/movement.

I can not afford to not go belt and braces on this job so I'm either going to take it with ditra or walk. What would you do ? I have already had the answer I respect from a certain tiler how. Just thought I'd put it out there for you guys and your input.

Thanks very much.

 

[Ian]

How long had he screed been down Cam?

 

[CJ]

I find it really difficult to persuade customers to go the Ditra route........must be just my area?
People just don't like paying for wot they can't see......never mind the plus points of it.

 

[cam_low]

Few weeks. 92rh% max reading. 75mm screed on ins boards and dpm.

Heads done in advising this couple. Hes wanting me to start Monday. Green Screed add and ditra. Or 75 days drying?

 

[J Sid]

New screed i think you have to use it Cam. Old screed, no ufh, i wouldn't use it.
I think it is a walk away. Shame, sounds a nice job.

 

[Ian]

Green screed addy is a must, I can't decide whether I'd be willing to risk leaving the ditra off the spec list. It's a porcelain tile so in an ordinary situation ditra wouldn't be necessary. Much like yourself, I like to go belt and braces on every job, would I walk away if there was no ditra? In all honesty, I think I'd walk purely because of the moisture that's still going to be in that screed, will it debond the tiles? Will it discolour the grout? Maybe not but, it's a risk that doesn't need to be taken IMO. I think you've already decided what your going to do and you have to go with that.

 

[cam_low]

Im going to send the email. He does have other bathrooms for me to do that the builder attempted lol. I can crack those out first. See where we are at. 75th day with be 31th December. Exactly where I want to be on NYE lol.

Would the green screed addy be used to fix the ditra solely or both ditra and tiles ? Have you seen how much it is !!!

 

[CJ]

And I bet the builder has said "it's fine to tile NOW"

 

[John Benton]

As above, I think you would be taking too much of a risk and leaving yourself open for failure Cam, and it's your door they come knocking on mate!!!

 

[Ian]

Just green screed for the ditra, SPF to fix the tiles.

 

[cam_low]

how much m2 will I get from a bag for the ditra at 4x4?

 

[Stef]

Cam you can modify Weber set + with AD250 to go onto a green screed, save a fortune on Bal gear.
Think you can modify Weber Eco also but check 1st.

 

[Ian]

Tilemaster ultimate S2 is suitable for green screeds, you'll get 12 m2 at least from a 20kg bag.

 

[cam_low]

Ah this is sounding good as the whole order is coming from Lee@TT so I can give him a call tomorrow and change the requirements and hit him with the price !

any ideas on a bag price of TM Ultimate ?

 

[Ian]

Ah this is sounding good as the whole order is coming from Lee@TT so I can give him a call tomorrow and change the requirements and hit him with the price !

any ideas on a bag price of TM Ultimate ?

Not sure on price to us trade types, it's £19.95 on the web site though.

 

[cam_low]

Bri the data sheet says 5-6m2 at 3x3mm trowel...Im assuming you are right though heeheehe

 

[Brian the Tile]

12mts from a 20kg bag ?:lol:

 

[J Sid]

12mts from a 20kg bag ?:lol:

We wish.

 

[Ian]

It says 5-6 metres at a 3mm bed depth, if you use a 4/6 mm notch the bed will be 1 maybe 1.5mm so it will cover 12m+ trust me.

 

[cam_low]

Cool cheers bri for pointing that out in so tired. 45 hours this week already

 

[Ian]

Cool cheers bri for pointing that out in so tired. 45 hours this week already

I should have quoted your post #11, the 12m is only for the fitting of the ditra. For a tiling application it will be 5-6m as stated. Sorry for the confusion folks :lol:

 

[Stef]

I should have quoted your post #11, the 12m is only for the fitting of the ditra. For a tiling application it will be 5-6m as stated. Sorry for the confusion folks :lol:

I used 10 bags of AnhyFix to fix 80m2 with a 10mm notch..
That in my book is dam good coverage..

 

[prceramics]

rang Schlüter the other day and they said not to use there product in a wet screed unless its not over 50mm deep more than that would have to wait the full drying time?

 

[cam_low]

Pr if you read full post it's a 1:4 s&c mix not wet.

Svhluter said this...
When installing Schlüter®-DITRA onto a 75 mm "green" cementitious screed, a 10 - 14 day minimum drying period is advised. *Schlüter®-DITRA can then be installed as described in the 6.1 Schlüter®-DITRA datasheet (see below).



Please note, when selecting a suitable adhesive to adhere the Schlüter®-DITRA to the substrate, you must first ensure the adhesive is suitable for the background, also it needs to be a C2 category with the maximum flexibility of an S1 category. So for example a"C2FS1" category is suitable but a "C2FS2" or a "C1FS2" is not.

Should you require any further assistance, please do not hesitate to contact us.

This excludes tile master ultimate yet mark says his tomato is, 'fine'

Hello confusion

 

[prceramics]

Sorted mate you got it in writing I was only going by a phone call I had to them about tiling onto a 100 mm cement screed that was reading 85% humidity they said ditra would be no good because the screed was still wet and I would have to wait until it was down to 75% then they added if the screed was only 50mm it would be fine didn't really understand it but I am going with that advise and will wait until then and Tile without ditra