Our stand up shower is barely 2 weeks old and the shower doors are already falling off!

Looks like the only thing holding it in place is cheap sealant? Shouldn't there by some type of rubber covering on the edge of the glass to where the hinges slides into? Instead of cheap glue holding it in place?

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Often silicone as a glue is more than sufficient for a hinge like that. Some are designed to use rubber bumpers, but they usually use a compression style attachment with screws. I've used silicone it to attach drink rails to bars and counter tops to cabinets. However if it is not applied appropriately and does not remain motionless until it cures, it does become weak. If however you need something stronger I could suggest Lexel or a clear Polyseamseal.

Why not contact the installer? 2 weeks old should be a warranty item.

Agreed!!