re: Leaking Large tile Shower for home that is 7 years old… legal question

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Nothing at all wrong with redgard (two coats) over CBU.

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Yep tape the seams and apply RG. A lot of people don't know how to install the Schluter system despite saying they do. On top of Schluter itself being expensive, installers also charge about double to install it vs the other ways of waterproofing.

Whoever built my house sunk in the shower pan and put in the vinyl liner 20 years ago. It still leaked because they did a crappy job. We relined it properly and then built the pan back up with 4 to 1 Mud Bed mix and tiled over it.

Everything I did was still cheaper than overpaying for Schluter and I promise you it is just as waterproof if not more so.

You usually get one year, faulty installation or not. Some people knowingly cobble things together so it looks okay and will last at least a year before the homeowner starts noticing signs indicating there is a problem, or problems.
A reputable installer will warranty his work forever. Others, not so much.

OP still needs to understand that not waterproofing and a tile falling off are not necessarily related. Waterproofing goes between the tile mortar and cement board. The waterproofing doesn’t have anything really to do with the tile falling off or at least it shouldn’t? Waterproofing has to do with the water getting behind the cement board, tile falling off is in front of the cement board.

In other words, a tile could fall off and it still be waterproofed normally.

There’s all different brands of waterproofing. Redguard is just one brand and is red, there’s yellow and blue and probably others.

Anything around water should be red guarded IMO
It is a fantastic product I did it on all my exterior windows and openings.
They make a blue/ greenish color for roofs and exterior OSB.
It's expensive but I won't have a leak

I have to disagree. The Schluter system did not fail. It will not fail. It was installed incorrectly.