Thin Multi Tool Blade

[Flintstone]

can anyone recommend a good grout removal blade for fein, I have the saxton ones but they are very thick, too thick for some narrower joints

 

[White Room]

I bought one of the saxton blades 90mm Diamond Blade, Saxton Blades, don't think you'll find the fein much thinner.....bought a fein diamond many years ago and it was rubbish especially for the money.

 

[Flintstone]

They look much more like the fein ones! The one I tried are these ones, quite a price difference.

3 x Saxton 63mm Carbide Blades for Dewalt Stanley Oscillating Multitools

 

[White Room]

I tried those not much kop for getting the old grout out

 

[Flintstone]

Too thick, probably be alright if you had a really wide joint to take out

 

[WetSaw]

I've used the metal cutting blade before to remove the grout around a couple of tiles and it worked, wouldn't want to do loads like that though!

 

[White Room]

Re-grouting is brain numbing

 

[Flintstone]

Big time, I avoid it. Although yesterday I went to re grout a 35m polished porc floor for a regular customer, he said grout was failing and the manufacturers had been out etc. I lifted a tile, turns out, was an anhydrite screed and they didn't realise when tiling it, was agreed concrete was going in before hand. Didn't end up doing the re grout!

 

[Stef]

Big time, I avoid it. Although yesterday I went to re grout a 35m polished porc floor for a regular customer, he said grout was failing and the manufacturers had been out etc. I lifted a tile, turns out, was an anhydrite screed and they didn't realise when tiling it, was agreed concrete was going in before hand. Didn't end up doing the re grout!

How easy did the tile come up?
I tested tiles on a Gyvlon screed before, primed & un primed using a cement based addy & they came up as clean as a whistle.

 

[Flintstone]

They came up clean, back of tile looked like 100% coverage as it had a layer of the screed stuck to it or a skin of primer, or both: the floor was so clean it was like nothing had touched it. Came up easy just with a sucker I use for drill guide

 

[Flintstone]

I'm gonna book it in to take them all up and re do it. Is it right that tilemaster anhydrite fix can go straight on the screed without the need for sanding? Just 3 coats of primer

 

[White Room]

I think sanding is required what ever gypsum floor it is....from my understanding from Ajax

 

[Stef]

I'm gonna book it in to take them all up and re do it. Is it right that tilemaster anhydrite fix can go straight on the screed without the need for sanding? Just 3 coats of primer

You must sand the laitance off of the screed.
The layer that's stuck to the adhesive on the bottom of the tile is probably the laitance from the screed.
If your going with Anhyfix then use prime plus with it but mix it to a 5/1 as I've had it skin on me before & after testing I found the 5/1 the best for priming.
Give it just the one coat & tile.
Anhyfix is a great adhesive.
How long has the screed been down?
I would test it 1st to get a moisture reading to make sure it is dry.

 

[Flintstone]

It has been down a year, it was left a calculated amount of time per mm before tiling. Ile be speaking to tile master technical but I have it on good authority that you don't need to sand it with the current formula, 12 months ago it was required but now tilemaster and bal have got it sorted. So I'm told. As for the primer dilution, I'm told it is a specific rate but I'm not sure what.

 

[Flintstone]

What's the anhyfix like to use, I've not used it before, does it mix up like normal flexi or more like ultimate?

 

[Stef]

What's the anhyfix like to use, I've not used it before, does it mix up like normal flexi or more like ultimate?

It's a bit between the 2, it takes a bit more water than setaflex & you need to give it a good few minutes to let it slake.
I mix then mix a further twice. It's nice & smooth & sticks like the proverbial.

 

[LM]

It has been down a year, it was left a calculated amount of time per mm before tiling. Ile be speaking to tile master technical but I have it on good authority that you don't need to sand it with the current formula, 12 months ago it was required but now tilemaster and bal have got it sorted. So I'm told. As for the primer dilution, I'm told it is a specific rate but I'm not sure what.

It totally depends on the specific screed, they all use different quality of binders, some much better than others. All calcium sulphate screeds have a certain amount of laitance, some are that low that the producers claim there is none. I had an on site meeting today with BAL as it happens regarding this and their conclusion is to sand and hoover ALL these types of screeds. On another note these screeds are severely temperamental and can sometimes take longer than they should to dry. you should never tile one unless its been carbon bomb tested.

 

[Flintstone]

Ile be sure to make sure it's spot on!

 

[Stef]

I use a digital hydrometer to test the screed & I would be very dubious about tiling to a screed that hasn't been sanded.