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One of the key benefits to using grout is that you can make your installation look better than without.
For example, if you are doing a 16'x20' room, if your layout is off by even a hair, and you have no grout lines (butted install) you can't shift the angles at all without ending up w/ gaps. w/ grout, you can shift your entire lay to "hide" your mistakes... and you can hides that are a lot bigger than just a hair.
If the walls aren't damn near absolutely square, and straight, the grout lines are the ONLY thing that's going to make your install look decent.
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