grout all cracked within two days

Tiling questions and answers in here please

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pjenkins
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grout all cracked within two days

Post by pjenkins » Sat Sep 07, 2019 3:16 pm

So I framed and built a bar in a place I'm renovating. The bar is framed out in CLS; 18mm exterior ply on the outward surface; and a 12mm exterior ply with a 2mm PVC sheet on the inward surface. Between the shape and thickness of the bar walls; the bottom of the framing screwed down into the concrete every 400mm; the worktop screwed down with slotted brackets at the top of the framing; there is/was next to no play in the structure.

We chose a brick effect tile (250x60x10) and for this, we thought we'd get a professional tiler in as the bar has one 90-degree corner and two 45-degree corners and we wanted the tiles to be mitred and grouted with no trim.

The tiler came on Wednesday and got the tiles up and grouted in one day (two guys). He used a ready-mixed adhesive from the tub, 3mm spacers, and a powdered grout called Grout 3000 which does say it's flexible, suitable for plywood, and joints up to 20mm.

While the job looked great on Wednesday, sadly, I've come in today (three days later) to find the grout cracked from top to bottom on the corners and quite a few hairline cracks on the flats. The place was empty over the last two days so the bar wasn't being worked on; the heating was off; even the battens are still on at the bottom.

While there could be an element of movement in the bar I don't think that can be the cause of all this cracking. I'm wondering if the problem is more likely to be the fact that it was grouted immediately after the tiles were put up and the adhesive hadn't fully cured or whether there was enough grout pressed into the corners. Any thoughts on why the corners fared the worse?

Pretty gutted about it considering what I paid and the fact I was tempted to do it myself but thought I'd get a better finish getting a pro in. His work otherwise was ok but I would have spent more time myself cutting the mitres in the tiles although his "quickness" may have added to the rustic aesthetic.

Having phoned the tiler just there he said he would come round on Tuesday and go over it again with more grout.

So, my question is, will it be OK to go over one-week-old grout (by the time he comes back) with fresh grout to hide/fill the cracks that have appeared? - after removing any loose grout of course. I don't think he's going to be inclined to remove the grout entirely to redo it and I don't see the tiles coming out unscathed if he tried that either.
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wine~o
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grout all cracked within two days

Post by wine~o » Sat Sep 07, 2019 5:37 pm

Normally grout is applied at least 24 hours after laying tiles. the tile addy can/will "suck" moisture from the grout otherwise. (or the other way round)

Give your tiler a chance to put things right though. Even experienced trades can get it a little wrong.
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pjenkins
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grout all cracked within two days

Post by pjenkins » Sat Sep 07, 2019 5:59 pm

Just had the following exchange... not impressed.

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On the possibility I have to salvage this myself, will fresh grout over the exisiting hold?
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grout all cracked within two days

Post by Bob225 » Sat Sep 07, 2019 6:10 pm

what has it been tiled on to, ply or plasterboard?

was it grouted the same day it was tiled? it looks like a cement-based grout as well

Edit. looking at the gaps the grout has slumped (too wet)
pjenkins
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grout all cracked within two days

Post by pjenkins » Sat Sep 07, 2019 6:17 pm

18mm exterior plywood. Which was screwed into the CLS frame approx every 200mm. After the worktop went on you couldn't even make the frame creak.

It was grouted about an hour of the last tile being placed.
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grout all cracked within two days

Post by wine~o » Sat Sep 07, 2019 6:41 pm

So you found a "tiler" on facebook ?

As certain Dragons would say "I'm out"
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