Do I need to use Anti Fracture Matting

[Bill]

Personally, for that type of limestone and the joint width, I would use silver sand and cement. (save a lot of money too)

If you are not comfortable with that idea then you need to find a specific wide joint grout variety - there are plenty on the market.

Do try and work as clean as you can and you should be able to seal those after laying but before grouting. Always do a test in an inconspicuous area.

A 10mm trowel is not enough and I suggest getting a 20mm round notch like this one

20mm x 15mm U Notched Extra Deep & Extra Long Trowel £11.69 + VAT in stock - next day UK delivery plus Tile Cutters and Tiling Tools - https://www.tradetiler.com/20mm-x-15mm-u-notched-extra-deep-extra-long-trowel.html

Back butter the slabs too.

 

[Old Mod]

Agree with Tom above.
Good advice.

 

[Lorenzo Antolovi]

Cool, good advice I'll get the bigger trowel. However I have already purchased 5 x 25kg bags of Kerakoll Biofast rapid set (£26.28 per bag) and 3 x 10kg bags of Tilemaster 3000 flex grout for wide joints. If I use 20mm trowel does that mean I have to get another 5 bags of adhesive. The area is 19m2.

The second question is, the primer arrived yesterday "Kerakoll Eco A" 10 litres in total. There is allot of talk on the product about Anhydrite based substrates etc etc. I looked on their website and I can't figure out the dilution rate with water. Does anyone have any clue on this. My subfloor is bog standard concrete from a mixer wagon. Hope someone can help and thanks for previous replies.

 

[hmtiling]

Ca pietra denham stone?
Do yourself a favour and get a wide joint specific grout and 2 coats of sealant first. Universeal rapid all in one would bey choice.

 

[Bill]

just use it 2-1 for the first coat and then 1/1 for the 2nd coat for concrete.

It is a good primer.

 

[Flintstone]

With regards to adhesive consumption with that large u notch trowel, you will be using about 8 - 10kg per meter from my experience

 

[ar2ro]

Ps blatant advertising from the fellow above , no idea what that primer is , ar2ro, what else do you sell

I just give advice on base on my 25 years experience in tiling and I recommend stuff which one I use and start selling, because is not on UK market.

 

[Time's Ran Out]

@ar2ro - we welcome all new members to the forum and somewhere there are rules to read and accept!
I edited your link after it was highlighted by others. We have forum sponsors who pay to advertise with us and so please refrain from promoting any personal products.
Continue to add any of your experiences and comments.
John

 

[Qwerty]

Forum Rules - https://www.tilersforums.com/pages/rules/

 

[Time's Ran Out]

That’s them!!!
I’am going to bookmark them for when I’am sitting down in the morning - same time every day.

 

[Lorenzo Antolovi]

Right I have 125kgs, looks like I should get another 2 bags, maybe even 3. Well the savings I made on the tile (£26/m2) have been very useful as this is starting to get expensive. Wish I new about the silver sand and cement before, but I'm committed now. Also once I collapse the ridges of the adhesive anyone know roughly how high the tiles will sit on the mortar.

Cheers all.

 

[Unused Account 1]

Dont have the joints so wide