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Old 05-30-2008, 07:30 AM   #1
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Using concrete as grout for slate floor


Hi, I'm new to the forum. I'm replacing some slate floor tiles and need to match them up to the existing ones. The new tiles are in place, adhered with thin-set mortar. Now it's time to match the grout. The existing grout looks like a concrete or aggregate (see photos). Not sure where to buy it or how to apply it. (I also need to "discolor" it to match the old!) Nowhere in my Google searches have I found examples of using concrete as floor tile grout. I would appreciate any ideas -- thanks!
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Last edited by sometimes handy; 05-30-2008 at 07:35 AM.
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Old 05-30-2008, 08:38 AM   #2
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Using concrete as grout for slate floor


Ok, slate is very nice...but I just learned the heardway...you need to seal the slate first with a sealer. It is a must!

If you do not, the grout WILL STICK to the slate if you do not. And trust me, it is a pain in the ass to get off.

As for matching the grout, is may be difficult because as grout ages it darkens. Your best bet may be to grout with a colour very close to the existong and then use a linsead oil to darken the grout.

Not sure if thats the right answer, but it is my first thought.

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Old 05-30-2008, 08:53 AM   #3
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Using concrete as grout for slate floor


That is a rather large grout joint. For any joint over 1/8" you use a sanded grout. Sanded grout is actually is a form of cement. Look for one without any color added.
You don't say where you're located so I'll just throw one out there I've used before.
Mapei Keracolor S (the "S" is for sanded which you need)
http://www.mapei.it/Referenze/Multim...lorS_TD_EA.pdf
http://www.mapei.us/DistributorLocator.htm

Good luck.
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Old 05-30-2008, 09:13 AM   #4
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Using concrete as grout for slate floor


You won't match that grout.

The example shown IS NOT a manufactured tile grout and is probably sandmix. There is nothing wrong with using sandmix in this case it's done all the time. But you still aren't likely to match what's there. Remove ALL the grout and regrout everything - then it'll match.
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Old 05-30-2008, 11:02 AM   #5
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Using concrete as grout for slate floor


Quote:
Originally Posted by Bud Cline View Post
You won't match that grout.

The example shown IS NOT a manufactured tile grout and is probably sandmix. There is nothing wrong with using sandmix in this case it's done all the time. But you still aren't likely to match what's there. Remove ALL the grout and regrout everything - then it'll match.
I was going to suggest removing, but I didn't want to scare him...lol

If you get the right tool, removing the grout is not that bad.
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Old 05-30-2008, 04:03 PM   #6
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Using concrete as grout for slate floor


Why not just use a grout colorant.

Aquamix makes a great product that has an epoxy base and seals the grout as it changes its color.
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Old 05-31-2008, 06:30 AM   #7
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Using concrete as grout for slate floor


Quote:
Originally Posted by MattCoops View Post
Why not just use a grout colorant.

Aquamix makes a great product that has an epoxy base and seals the grout as it changes its color.
Thats not a bad idea, just get the new grout as close to old colour as possible, and it should be fine.
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Old 06-02-2008, 11:28 PM   #8
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Using concrete as grout for slate floor


You all are great -- thanks so much. I'm not willing to remove all the existing grout (it's a long hallway plus an adjoining room, all slate floor!) So I guess I will do a sand mix and try to match it as close to existing stuff as possible -- both in terms of consistency and color.

And I will seal the new tiles beforehand . Thanks again.

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