pva in grout

[Little5]

Has anyone ever heard of mixing pva with grout. Ive heard its supposed to minimise cracks, where the tiles are already laid onto suspect substrates.

 

[IGTiling]

Never heard of that before and personally wouldn't recommend it, the PVA could adversely affect the properties of the grout. If you're going to put anything in then buy a proper grout additive, PVA is wood glue.

 

[grumpygrouter]

...and what happend when the grout gets wet?

 

[Ian]

As above, that is not a good plan. There are flexible grouts on the market that have additives in them already. And finally, you should not be laying on suspect substrates!!!!!!!!!

 

[Little5]

Im not doing the job, i heard it from another tiler who got it from a manufacturer !!!!!, Im a good boy wouldnt tile on anything thinner than 18mm ply or cement

 

[user123]

Yes, I have heard it, too, many many times, there are youtube videos on it primarily aimed at the artistic mosaicist, it is meant to make the grout smoother to mix, it is written about in books, and passed on on forums and it's just rubbish.

Yes, you can add aditional latex SBR (which is not PVA) if extra flexibility is required for situations where there is a lot of vibration for example, but pva is a glue that is flexible while wet, so is of absolutely no use as a "rubberiser" when dry. One of those stupid stupid rumours.

 

[Ian]

Which manufacturer??? Sounds like some advice from B & Q :lol:

 

[doug boardley]

Never heard of that before and personally wouldn't recommend it, the PVA could adversely affect the properties of the grout. If you're going to put anything in then buy a proper grout additive, PVA is wood glue.

spoken just like one of our old most trusted members sWe, great reply

 

[Gazzer]

Bal GT1 admix, Biscem flex bond are a couple that can be added to give grout a certain amount of flexibilty

 

[Mortarforker]

I would not use any additive in an already modified grout. Too much additive leads to trouble..Latex leaching..A white residue on the grout..I just follow the bags instructions..I have also heard story's of adding sealer to the grout mix..:smilewinkgrin:

 

[doug boardley]

]I would not use any additive in an already modified grout[/I]. Too much additive leads to trouble..Latex leaching..A white residue on the grout..I just follow the bags instructions..I have also heard story's of adding sealer to the grout mix..:smilewinkgrin:

I totally agree Don, however OP hasn't stated that it's a modified grout...still pva in a tiling environment, just bin it!

 

[Mortarforker]

I totally agree Don, however OP hasn't stated that it's a modified grout...still pva in a tiling environment, just bin it!

Is" PVA" Poly vinyl acetate? Or Horse fat..AKA wood glue..Elmers glue..?

 

[user123]

Is" PVA" Poly vinyl acetate? Or Horse fat..AKA wood glue..Elmers glue..?

Same as weldbond, a bit thinner at times depending on brand..

 

[Mortarforker]

Mosaic Girl, It sounds like concrete bonding liquid..Bond new concrete to old with the primer..AKA Weldbond..I got it now..Thanks.

 

[user123]

Oh, you're confusing me now, I thought Weldbond was Polyvinyl Acetate, the woodglue? I only know of it as my mosaic friends in America use it ... yes, this is the link... same stuff then... FAQ | WELDBOND® I had never heard it being called concrete bonding liquid before.. anyhow, bedtime for me..