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Unread 09-27-2020, 04:58 PM   #1
jlogan
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New install/grout has spaces

I grouted my glass mosaic backsplash and came away with some missing grout in some areas and some cracking (grout to wet).

What are my options for both issues?

How in the world do you properly grout between hot/cold and faucet when they are wall mount?

J.
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Unread 09-27-2020, 05:53 PM   #2
jadnashua
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If those cracks are shrinkage cracks, that's one thing, but if they are from movement, that's another!

Generally, for grout to hold, you need more than half the depth removed for the new stuff to bond properly. That's going to be a pain, but the sooner you start, the easier it will be. Grout gets harder by a lot over the first few days, then slows down. In reality, it will continue to get harder for potentially years, but the vast majority happens in the first few days, and industry rates the overall strength after a 28-day period.
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Unread 09-27-2020, 06:46 PM   #3
Tool Guy - Kg
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Judging by how low the grout is, the grout was too wet. Unsanded grout shrinks a lot more than sanded grout...and even more if it’s mixed a little too wet.

When you ask how you grout between the hot, cold, & faucet on the wall, are you asking because it’s crowded together and asking how you get a float in there?

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Unread 09-27-2020, 08:32 PM   #4
jlogan
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That cracks are shrinkage because the grout was too wet, I'm positive of that.

The pictures may not show it well, but the spots where the grout is minimal is really...no grout at all. It's like the float didn't push grout into the space just floated over. Maybe again because it was too wet?

I guess the question is, can I remove the grout in the cracked seams and then filled those seems and the empty spots without removing all of the grout from the project?

And yes, how do I get a float between the fixtures. I chose to use a 1x1 wood piece of lumber which seemed to work pretty well. I'm betting that's not what a pro would do.
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Unread 09-27-2020, 08:59 PM   #5
jadnashua
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To push grout into the joints, you really do need to hold the float at an angle and cross those joints at an angle. A piece of wood would have a very hard time getting any pressure to fill the joints.

Proper mixing of most grouts versus overwatering it, can produce different cured colors, so new stuff you might use to fill those joints could end up looking a different color.

You could try putting new stuff after removing the cracked material, but I wouldn't be really confident of the end result. Fresh grout is still fairly soft, so you may get it out and start over...normally, you need more than half the depth to get new stuff to bond well...
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Unread 09-27-2020, 09:12 PM   #6
jlogan
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Yeah, it's a day old, so it's fresh. I'll just remove it all and start over.

Thanks for the help guys.

Oh and I found a skinny float in my tool box. It'll fit between the fixtures.
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Unread 09-28-2020, 10:29 AM   #7
Davy
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After spreading the grout, don't be afraid to let it set up 10-15 minutes before washing. You can't do this with all types of tiles but glass won't absorb the moisture in the grout very fast so giving it a little time will help the joints firm up which will help keep the joints full.
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Unread 09-28-2020, 07:46 PM   #8
jlogan
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That make sense. Thanks.

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