Italian Botteccino Marble Adhesive advice

[smashedpeanut]

Hi,
I'm starting a job next week, its 62 sq metres of 600 x 400 x 12 mm pale grey marble laid on to a cement screed which has plumbed underfloor heating.
I normally use Mapei Keraflax Maxi for all my jobs but have been advised by Mapei not to use it as there is a risk of water staining, they recommended using Kera Quick - problem is that I hate using rapid setting adhesive and also it apears that an additive has to be employed to make it properly flexible.
Has anyone out there used a good quality flexible non rapid set adhesive you can recommend for using with marble?
Thanks heaps in advance!
Steve

[tfs]

Kerraquick is a gret adhesive especialy with the admix.

I would go for the keraquick, fix all the full tiles first if you are worried about the mix going of too quick. By the time your done you could ewalk over the floor and do all the cuts.

You will be surprised at how much quicker you can get the job done on large areas with this stuff.

Keraquick on its own is just as flexable as Keraflex maxi but, when you add the latex plus it makes it even deformable increasing it to s2 classification

[tfs]

Ultraflex mono is a single part s2 adhesive slow setting adhesive but, I think its around £50-60 for a bag!

[smashedpeanut]

Thanks for the advice guys, I just find rapid setting adhesive a bit of a nightmare to work with as it goes off so quickly - just as the name suggests.
This job is for a super fussy client and she will accept nothing short of perfect which is fine but using rapid set is going to minimise my normally fixable mistakes to zilch...
Any more advice on which Mapei primer to used on the cement sceed?
Thanks again!

[kilty55]

keraquick is a great addy but is not the fastest to go off despite the name rapid set attached to it,it may work for you better since you dont like r sets good luck sounds a nice job

[tfs]

A few coats of primer G should do the job!

I would get the 5ltr tub for this job though

[Dave]

Keraquick will be fine, it is an S1 flexible adhesive and does last longer in the pot.. so you will be fine... just mix smaller amounts..

[Scott]

Ultraflex mono isnt suitable for UFH so i wouldnt use that one

Id use the keraquik too. Although there is the Pro flexible from tile giant which is cheaper, but you would need to check ont he suitablity with your stone.

Mix up in smaller quantities than with and extended set. Its suprising how quickly you get into a rhythm of mixing and laying. As mentioned it does actually speed up the process too which then makes up for the extra time mixing and cleaning tools etc.

[tfs]

Ultraflex mono isnt suitable for UFH so i wouldnt use that one

Id use the keraquik too. Although there is the Pro flexible from tile giant which is cheaper, but you would need to check ont he suitablity with your stone.

Mix up in smaller quantities than with and extended set. Its suprising how quickly you get into a rhythm of mixing and laying. As mentioned it does actually speed up the process too which then makes up for the extra time mixing and cleaning tools etc.

Did Mapei tell you that matey? about the utraflex

[Sir Ramic]

Ultraflex mono isnt suitable for UFH so i wouldnt use that one

Looking on the Mapei book I have it says ultraflex is ok for UFH.

[tfs]

Yes, I think its just not suited to the heating element used in electrical under floor heating as stated in the data sheet for the product.

You never know with Mapei though! lol the book says one thing and they can turn round and say another.

I guess at the end of the day its down to peice of mind and if someone calls the tec department they will reccomend the absolute best fo the job at hand.

[Sir Ramic]

It says "Do not embed electric under floor heating elements in the layer of adhesive" Which is different to saying its not suitable and we always say embed the UFH in SLC anyway.
http://www.mapei.com/public/GB/produ...%20mono_gb.pdf

[Scott]

Mapei Ultraflex S2 Mono Flexible Adhesive*-*Floor Tile Adhesive*-*Tile Adhesive*-*Tile HQ

Says not suitable for UFH, but yes the data sheet does go further and say about electrical in the addy

[tfs]

yes, so it would be a case of slc first and then using the adhesive when using over electric mat but would be perfectly suited to a plumbed in under florr heating sytem. As long as Steve ensures that the floor is clean dry and primed etc

[deanotile]

how about sealing the back and edges of the marble and then you can use the adhesive you are comfortable with.

[tfs]

I dont see why Steve coudn't use Keraflex maxi anyway. Its suitable for under floor heating and its a good adhesive.

I think the comment the guy in the shop made about about Keraquick and latex plus was said as it would be the better choice as the stuff is bulletproof. If I wasnt gonna use Keraquick then the keraflex maxi would be the next one down that I would go for as I feel that it is better suited to this job than Mapeker, adisilex p9 and tile giants pro flex etc.