This tile was installed using a non-approved mortar application known as spot bonding. When tile is spot bonded it leaves voids under the tile that do not support the tiles. The unsupported tiles then have weak points that tile can break and possibly become lose.
Spot bonding is not an approved method for installing tiles. The NTCA handbook states that all tiles installed in wet areas must have at least 95% mortar coverage. The tiles above might have 50% coverage. In addition, all wet areas must receive the correct moisture proofing materials to be successful. There was not a moisture proofing product used in the above shower.
A great deal of attention is required to the details when installing tiles. The above photo is an example of some installers level of craftsmanship. An installer might be able to talk a good game, but fall short on performing.
Someone did not really know the correct process for build a quality shower. In the photo above a water proofing material was used for a grout sealer.
The photo speaks volumes about the comparisons of a quality minded, educated, trained and professional job v.s. I think I can do that.
We've been called to small and large jobs that have failed due to improper installation practices. In most cases these jobs end up costing the homeowner twice the orgianl costs if it had been installed correctly. Spot bonding is not an approved method of installation.
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