Anhydrite screed........

[Andy Allen]

Currently working out a price to tile one of these screeds, last one I did must of been 10 years ago, and things seem to have moved on since then.

First off, what's the tile master anhydrite a Adhesive like.

The screed has UFH and there using a porcelain tile, on a normal screed I wouldn't bother with a decoupling mat with a porcelain tile, is a decoupling mat essential with these screeds regardless of the tiles.

And what do you use to sand the floor, looking to hire not purchase, floors about 45m2

 

[hmtiling]

Tilemaster anhyfix is the best gypsum adhesive out there imo.
I always try to put a crack mat down and witch to cement based on top.
Is it definitely anhydrite?
Do you know who laid it?

 

[Old Mod]

The Anhyfix is ok Andy, still need to prime the floor.
Just not to the extent that you would if you were using a cement based adhesive.
Most people I know Mat it so they can use cement adhesive over mat.
I’ve sanded two of 50m2 and below with a flex, a grinding cup and decent vacuum.
If you hire one you can get a 60 grit copper plate apparently, that I’m led to believe is effective.
It would fit on to a regular cleaners buffing machine.
Or you could get a full blown grinding set up to hire.

 

[Andy Allen]

Tilemaster anhyfix is the best gypsum adhesive out there imo.
I always try to put a crack mat down and witch to cement based on top.
Is it definitely anhydrite?
Do you know who laid it?

Looks like anhydrite...

 

[Blunt Tool]

Why not go with the BAL flex bone and get them to spec that way all guaranteed
And no sanding!

 

[One Day]

It is Anhydrite from the look of it.
I use this: Floor Preparation System Hire - Tool Hire, Equipment Hire, Lifting Hire, Plumbing & Pipe Hire - Brandon Tool Hire - http://www.brandontoolhire.co.uk/en/surface-preparation/534-str-floor-preparation-system.html

Anhyfix is ok, a bit gloopy to use, but ok.
I prefer to use Ditra, fixed with Anhyfix and normal cement-based ontop.

 

[Andy Allen]

Why not go with the BAL flex bone and get them to spec that way all guaranteed
And no sanding!

Have you used that ?
Just had a quick look at it, looks a bit dodgy to me...

 

[Blunt Tool]

Have you use that ?
Just had a quick look at it, looks a bit dodgy to me...

Spoke to the Rep as long as all their products and method then all guaranteed, couple of tilers emm somewhere else has used it no probs said it was a doddle

 

[Blunt Tool]

I’ve got a 75 metre one to do after Xmas and I’m going to be using it

 

[hmtiling]

If it happens to be a alpha hemi hydrite screed from Mayhew knauf say they don't need sanding

 

[Andy Allen]

I’ve got a 75 metre one to do after Xmas and I’m going to be using it

I feel a review coming soon then !

 

[Blunt Tool]

I feel a review coming soon then !

Yes look forward to it you will set my mind at ease for when I do mine, I may pick your brains for advice

 

[Andy Allen]

If it happens to be a alpha hemi hydrite screed from Mayhew knauf say they don't need sanding

There's a fair bit of loose white crap on the surface..

 

[Andy Allen]

Yes look forward to it you will set my mind at ease for when I do mine, I may pick your brains for advice

You first, I haven't booked this in yet..

When's yours booked in for ??

 

[Blunt Tool]

You first, I haven't booked this in yet..

When's yours booked in for ??

Don’t know as builder still got a lot to do yet don’t wait for me I don’t mind if you go first

 

[Blunt Tool]

It’s around the price of Weber set plus with the vat a metre, this isn’t in the arms!
Edit that price is only what I’ve heard BAL rep didn’t give me a price

 

[Andy Allen]

I don't get how it stays down if it ain't stuck to the floor....

Might book it in for November......2019 .

 

[Cranbrook]

Not sure if I can post a link, but this machine is the business when dealing with this type of screed

 

[Old Mod]

Not sure if I can post a link, but this machine is the business when dealing with this type of screed

View attachment 102582

Bloody hell, you don’t think it’s a little ott!

 

[Cranbrook]

Bloody hell, you don’t think it’s a little ott!

I had 130 metres of anhydrite that had been down for 8 months... Took me four hours to sand it all with this bad boy

 

[Flintstone]

Anhyfix is glooopy it's a bit like ultimate to use but it does the job well. With porcelain I don't use any mat unless the screed is cracked or other issues. Personally I feel pumped screeds are growing in popularity massively so its worth the investment in a floor grinder. I use a 7 inch grinder with cowel and diamond cup. You can do about 50m a day without too much stress. Above that is a stand up machine like impish suggested but it's a big old machine. The BAL flexbone mat, yes it sounds alien but there a huge company they wouldnt bring it out if it was flawed.
How long has it been down ?

 

[Blunt Tool]

I don't get how it stays down if it ain't stuck to the floor....

Might book it in for November......2019 .

I do find it strange that CTD have said they aren’t stocking it and have no intention to do so?

 

[Fraser Tiling]

Just done 160 metre floor, laitance not removed for nine months.
My usual grit pad on rotary buffing victor 400 that would breeze laitance removal didn't touch it. A bigger heavier grit machine removed 6 square metres in two hours.
Customer had to descabble it to remove it in the end. Tore it to pieces in places but still struggled in others.
Used Kerakoll primers, adhesives, decoupler and addy to 15mm limestone.
No issues
All UFH too.
Good luck.
One last thought, any builder that skirts a floor before it's tiled deserves walking away from
Trouble

 

[Cranbrook]

Just done 160 metre floor, laitance not removed for nine months.
My usual grit pad on rotary buffing victor 400 that would breeze laitance removal didn't touch it. A bigger heavier grit machine removed 6 square metres in two hours.
Customer had to descabble it to remove it in the end. Tore it to pieces in places but still struggled in others.
Used Kerakoll primers, adhesives, decoupler and addy to 15mm limestone.
No issues
All UFH too.
Good luck.
One last thought, any builder that skirts a floor before it's tiled deserves walking away from
Trouble

This would have flown through it

 

[Andy Allen]

Anhyfix is glooopy it's a bit like ultimate to use but it does the job well. With porcelain I don't use any mat unless the screed is cracked or other issues. Personally I feel pumped screeds are growing in popularity massively so its worth the investment in a floor grinder. I use a 7 inch grinder with cowel and diamond cup. You can do about 50m a day without too much stress. Above that is a stand up machine like impish suggested but it's a big old machine. The BAL flexbone mat, yes it sounds alien but there a huge company they wouldnt bring it out if it was flawed.
How long has it been down ?

It's been down since the end of August,
UFH been on for 4 weeks...

 

[Ajax123]

This would have flown through it

View attachment 102584

This sander with a turbodisk attached will easily deal with the Laitence if its all like the pics. It looks pretty damp though so do a moisture test before you tile it. As for adhesives and ball suggesting they have a system that doesn't require sanding... well i doubt it...

 

[Blunt Tool]

This sander with a turbodisk attached will easily deal with the Laitence if its all like the pics. It looks pretty damp though so do a moisture test before you tile it. As for adhesives and ball suggesting they have a system that doesn't require sanding... well i doubt it...

No sanding, no priming, no adhesive (loose laid) is what they are claiming?

 

[Blunt Tool]

@Andy Allen needs to test this for us, he likes BAL adhesives, he’s the perfect pioneer

 

[J Sid]

last one I did I sand as marc and stuck Ditra down with Ardex AF 200 Plus then tiled as normal

 

[Ajax123]

No sanding, no priming, no adhesive (loose laid) is what they are claiming?

Ah I see. Loose lay .... yes that would negate sanding. I know similar systems were used in Germany but ive not come across them for several years. I think genesis did one as well.