Grout cracking within minutes of applying - TilersForums.com

[ad tiling]

Remove the cracked grout then go to a tile shop and buy wide joint
flexible grout, mix per info on the bag if it still cracks then the floor
has movement or addy not suitible for chipboard. hope that helps

 

[tfs]

try Mapei Ultracolor plus. If it still happens then I am 90% sure that it is your subfloor that has not been adequatly prepared. If it wasnt your subfloor then I could only assume that you have your heating on full blast and this is effecting the grout as it sets.

Ultracolour is a Flexable grout. Make sure you mix it to the correct measurements as described on the bag.

 

[tfs]

perhaps you can try a test for us mate?

go to a corner of the room and with a pencil mark the point where the tile height is on the skirting board, stand on this part of the tile and see if the tile goes below the mark you made on the skirting.

If the tile apears to sink further below where you marked then you most probably have a floating floor. Some floating floors consist of sound and heat insulation boards layed directly over onto and then sheeted over with chipboard this is not suitable for tiling onto.

 

[Heritage John]

I would take the grout out and re grout it with bal superflex you can buy it from any topps wont be cheap if your not in the trade but i think its best flex grout out there

 

[DHTiling]

Hi Stevie...just remove and use a more suitable grout as mentioned...mapei/bal etc...not a pre-mixed one..

 

[Alan.P]

I can't add much to the advice already given about buying a good brand grout, the only things I would ask is with what, and how did you prepare the chipboard prior to tiling ?

 

[White Room]

You don't mention what tiles you laid

 

[obobsmith]

I can't add much to the advice already given about buying a good brand grout, the only things I would ask is with what, and how did you prepare the chipboard prior to tiling ?

Same here just hope chipboard has been prep'd properly ( hardibacker or ply and lots of screws).:smilewinkgrin:

 

[heavytrevy]

Grout cracks for many reasons, Overmixing causes shrinkage, drying to fast,
Too much water in the mix , im betting the chipboard is sucking the water out of the mix causing the cracks.
try a wide joint grout as somebody else has suggested


Trev

 

[jay]

hi as above and just how wide are your joints:8: