Discuss Cracked tiles on big floor in the Canada Tile Advice area at TilersForums.com.

merit

TF
14
493
Hi all
Just had a call from a customer who's floor was finished two weeks ago
Tiles are 900 by 900 porcelain
Fully bedded ,back buttered installed correctly
The l shaped cuts around certain walls have cracked
First thoughts were expansion of floor, but tiles go under dot and dabbed walls around perimeter
Under kitchen units , and there are a number of silicones movement joints around doorways ect
Floor is block and beam with insulation under floor heating and screed
Screed is rapid setting dry mix
Screed was ok to tile as far as moisture
But builder had to level floor prior to tiling by mechanically scraping the screed to get it level
It's not something I've come across before
All input apprceciated
 
I had this on 800x800 tiles on a wet heated screed. Used Ditra then levelled then tiled. All tiles had a diagonal crack in them where I had done L cuts.
I had to dig out and replace these tiles and changing the L cuts, by rounding off the right angle to a rounded internal corner with a drill and angle grinder. This spreads the pressure on the point of the L cut.
It worked and the floor has been fine for two years now.
 

Ajax123

TF
Esteemed
Arms
932
1,213
Lincolnshire
any joints in either the screed or the tiles across the door thresholds. Heated screeds should also have joints to form bays of no more than 40m2 and no more than 8 linear meters. also grout joints on big tiles like that will play a part in restraint. I always recommend minimum 3mm with ideally 5mm for very large tiles.
 
O

Old Mod

My first thought is the same as muddy above,
did you core drill the corners before cutting your L shape merit?
Apologies if I'm teaching you to suck eggs, but I'm afraid your name is not familiar to me.
I fit a large amount of ex large format thin tile, and drilling the corners is a must, or there is a very high likelihood they will crack.
As tile formats get increasingly larger, this problem is becoming far more frequent.
The larger the radius of the hole, the more stable the cut.
If I need to keep tight to the wall or skirting or whatever it may be, I will undercut the corner just enough to enable me to slide the corner of the tile under. That will allow you to keep tight on the sides and still keep the radius. Then a tight bead of Silicon will cover anything else.
 

merit

TF
14
493
Tiles are 10 mm porcelain
Are you saying core drill the internal corner then take the square or waste out
Leaving a small radius of the cored hole
Being tight to the wall is not an issue as I'm going under plaster board walls
This is something I've not come across as always l shaped the cuts square
Cheers
 
O

Old Mod

Are you saying core drill the internal corner then take the square or waste out
Leaving a small radius of the cored hole

Yes, exactly that.

This is a piece I cut today, 1800 x 900 x 5.4mm
I used a 28mm core bit in the internal angle, and used grinder for the rest.
Always drill first, this helps relieve any surface tension too.

IMG_1619.JPG IMG_1623.PNG IMG_1624.PNG
 

mma

TF
Esteemed
Arms
374
568
Leicester
Hi all
Just had a call from a customer who's floor was finished two weeks ago
Tiles are 900 by 900 porcelain
Fully bedded ,back buttered installed correctly
The l shaped cuts around certain walls have cracked
First thoughts were expansion of floor, but tiles go under dot and dabbed walls around perimeter
Under kitchen units , and there are a number of silicones movement joints around doorways ect
Floor is block and beam with insulation under floor heating and screed
Screed is rapid setting dry mix
Screed was ok to tile as far as moisture
But builder had to level floor prior to tiling by mechanically scraping the screed to get it level
It's not something I've come across before
All input apprceciated
Did you use clips?
 

merit

TF
14
493
Yea clips were used
Took a few tiles up today's
Adhesive stuck to tile and bond to screed was sound
All day to remove 3tiles and clean adhesive from screed
Further inspection of screed ,this seems very brittle for a sand and cement screed, when chipping adhesive away the top was coming away
Around the edges the screed is no more than 40 mm in places and a small void is apparent between underside of screed and Dpm
Has the screed curled as it has dried due to uneven thikness
Screed has been down 5 months
 

Ajax123

TF
Esteemed
Arms
932
1,213
Lincolnshire
I'm guessing it will have curled at that depth but also might be an apple pie. Compacted well at the top but not underneath so the top is strong but comes away from the underneath which is weak due to lack of compaction. We call it the apple pie effect. Its a very common problem ith semi dry screeds.
 

mma

TF
Esteemed
Arms
374
568
Leicester
Yea clips were used
Took a few tiles up today's
Adhesive stuck to tile and bond to screed was sound
All day to remove 3tiles and clean adhesive from screed
Further inspection of screed ,this seems very brittle for a sand and cement screed, when chipping adhesive away the top was coming away
Around the edges the screed is no more than 40 mm in places and a small void is apparent between underside of screed and Dpm
Has the screed curled as it has dried due to uneven thikness
Screed has been down 5 months
I did a 40m2 600x600 floor without levelling clips, had a few L cuts, and no issues. Did the utility room next door but used levelling clips, and there are hairline cracks on the L cuts. So my thinking is that the clips have put too much tension on the cut tiles.
 

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Cracked tiles on big floor
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