Make life easy, search the forum.

Discuss Has all my Laitance been removed?? in the Tiling Advice | Tile Forum area at TilersForums. USA and UK Tiling Forum

Reaction score
1
Please checkout the following advertisement.
So my liquid anyhydrate screed was laid in December, the laitance was removed mechanically by a sanding machine with diamond cutter 5 days later. I'm on the verge of getting the floor tiled in the next week or so. I commissioned the ufh a few weeks ago. Now I'm getting cold feet thinking the laitance hasn't fully been removed. I've attached pics for all you pros to see and hopefully reassure me that everything is fine and I'm overthinking. The floor does need a good sweep and vac but my question is do I need to get the guy back to sand it again?? It cost me £200 to get it sanded in the first instance.

20210520_154151.jpg


20210520_154140.jpg


20210520_154129.jpg


20210520_154105.jpg


20210520_154051.jpg


20210520_155747.jpg


20210520_155728.jpg
 
OP
A
Reaction score
1
Nah. Just hoover it up. What method are you using to tile it ?
Ideally I would like to use anhyfix to fix the ditra mat but finding it hard to source the product. Ontop of the ditra itll be setaflex to fit the tile. If I cant get hold of the anhyfix what would the next best method?
You're help and advice is very appreciated.
 

Dave

TF
Staff member
Esteemed
Arms
Reaction score
389,871
Ideally I would like to use anhyfix to fix the ditra mat but finding it hard to source the product. Ontop of the ditra itll be setaflex to fit the tile. If I cant get hold of the anhyfix what would the next best method?
You're help and advice is very appreciated.
Might be wrong but not sure anhyfix is suitable for ditra. Best check with schluter. It’s not an https://www.tilersforums.com/forums/tile-adhesive/ I’ve used.
 
OP
A
Reaction score
1
Might be wrong but not sure anhyfix is suitable for ditra. Best check with schluter. It’s not an https://www.tilersforums.com/forums/tile-adhesive/ I’ve used.
What would be your preferred method? What https://www.tilersforums.com/forums/tile-adhesive/ would you use with Ditra matting and porcelain tiles? And what primer?

Thanks
 

Dave

TF
Staff member
Esteemed
Arms
Reaction score
389,871
What would be your preferred method? What https://www.tilersforums.com/forums/tile-adhesive/ would you use with Ditra matting and porcelain tiles? And what primer?

Thanks
I’ve done quite a lot of them now. I prime with acrylic primer 4 to 5 coats following directions for anhydrite screed. Fix matting with spf rapid and same for tiles. I use weber products. The screed must be dry and fully commissioned.
 
OP
A
Reaction score
1
I’ve done quite a lot of them now. I prime with acrylic primer 4 to 5 coats following directions for anhydrite screed. Fix matting with spf rapid and same for tiles. I use weber products. The screed must be dry and fully commissioned.
4 to 5 coats?? What dilution ratio do you use per coat? I'm getting alot of conflicting information in regards to the type of https://www.tilersforums.com/forums/tile-adhesive/ used with anyhydrate screed. Some say cement based https://www.tilersforums.com/forums/tile-adhesive/ is a no no as can it can have issues with bonding to the screed and anhyfix (gypsum based) is the way to go and some say there's nothing wrong with a cement based https://www.tilersforums.com/forums/tile-adhesive/. I just dont want to make a very expensive mistake.
 

Dave

TF
Staff member
Esteemed
Arms
Reaction score
389,871
4 to 5 coats?? What dilution ratio do you use per coat? I'm getting alot of conflicting information in regards to the type of https://www.tilersforums.com/forums/tile-adhesive/ used with anyhydrate screed. Some say cement based https://www.tilersforums.com/forums/tile-adhesive/ is a no no as can it can have issues with bonding to the screed and anhyfix (gypsum based) is the way to go and some say there's nothing wrong with a cement based https://www.tilersforums.com/forums/tile-adhesive/. I just dont want to make a very expensive mistake.
I use a 4:1 ratio and not had a single issue with bonding . Yes gypsum https://www.tilersforums.com/forums/tile-adhesive/ can be used to adhere the tiles but like i said , not sure schluter uk advise to use it with Ditra.
 
OP
A
Reaction score
1
I use a 4:1 ratio and not had a single issue with bonding . Yes gypsum https://www.tilersforums.com/forums/tile-adhesive/ can be used to adhere the tiles but like i said , not sure schluter uk advise to use it with Ditra.
Is that 4 parts water to 1 part primer or the other way around? And do you use the same ratio for every coat? Thanks
 
OP
A
Reaction score
1
Just to update I've hoovered the whole floor and I've noticed theres areas of lighter patches. Could this be laitance stuck to floor or is this normal?

20210522_192554.jpg


20210522_192454.jpg


16217084143216422768948520894442.jpg
 

Reply to Has all my Laitance been removed?? in the Tiling Advice | Tile Forum area at TilersForums.com

Or checkout our tile training advice or the Tile Standards

This website is hosted and managed by www.untoldmedia.co.uk. Creating content since 2001.

New Tiling Questions

UK Tiling Forum Stats

Threads
66,600
Messages
866,704
Members
9,511
Latest member
mmcdon47
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock