With all the linking to John Bridge's tile forum today I took a moment to read up on tile build going South. The Pros on John Bridge's site seem stumped over the wall tile cracking.
Not over a seam.
Proper thin-set used.
Proper thickness of thin-set.
Of my. Why can this be happening?
I see our local expert Jim has not added any useful info there. No word from John Bridge. Dana has no comment. How odd.
I think it's hilarious that the other "Tile Pros" don't understand how the shower is waterproofed. The poster used poly over the studs - lapping the shower liner and installed Durock. He tape the seams and to make it even better used AquaDefence to improve these penetrations. Pretty standard install but the Pro's on John Bridge's seem confused.
Can you say "Deflection". Can you say "Durock backer Board is crap"
My Two Cents - Worth the price Charged.... LOL
The only backer board I have found to date worse than Durock is Kerdi-Board....
Looking at the photo it appears that not enough screws where used. It could be that the installer used a tiny drill and the cement backer board screws stick up past the surface and when setting the tile he stress the tile on these screw heads.
It also looks like the cracks are over top of a wall stud. I suspect that the backer board was never installed tight to begin with. A common thing I find here in Vancouver. Perhaps the installers blouse got caught on his blouse? When boarding some ring shank galvanized nails work well to pin the board tight - then screw it off. If the screw does not sit flush it needs to be banged with a hammer or backed out and re-set.
Of all the experts we here about there how is it that none of these men know this.
Everyday the same
"This is probably in the "long shot" category, but I've read where highly modified thinset can shrink enough to cause "indent fracturing" on natural stone. The failure seems to be related to excessively thick mortar. I looked online for a TDS for the Pro-Flex Platinum but TheTileShop website doesn't post that info. The brand, Superior, is their own proprietary product.
I believe the theory is that uneven curing of a highly modified thin-set can cause stress fractures. The tile Bob's using is a relatively thin (5/16"), low-fired non-porcelain...I dunno but maybe worthwhile taking a closer look at the mortar properties.
I love this post. Now it might be the modified thin-set causing an indent fracture. The poster explained all ready that the thin-set coverage is less than 1/4" and we are discussing indent fractures.
I love the "Expert Tile Forum" full of such riveting information. I bet if that shower had Kerdi on it it never would have happened!!! OMG I crack myself up. What will be written next. When will someone say hey.... maybe there is a screw behind that tile? Maybe the backer board is not tight to the stud.
I know - someone should write "Have you downloaded John Bridge's eBook on Kerdi Showers?" hahhaha