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Old 09-09-2010, 12:20 AM   #1
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Filling Joints between Flagstones


I'm currently constructing a patio with Quartzite flagstone. I'm setting the flagstone with mortar on a concrete base. One thing that's not clear to me is what to use to fill the joints between the flagstones. The stones are in random shapes so the joint thickness varies but I think the max is about 2". I'm not sure which of these to use and whether they are the right thing for the application - sanded grout, mortar, polymeric sand etc. I think I also saw a bag of Quikrete precision grout - no idea what that is over regular grout.

Any pointers would be welcome.

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Old 09-09-2010, 09:52 AM   #2
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Filling Joints between Flagstones


when i redid mine i used the same material as we used to lay the flagstone.

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Old 09-09-2010, 07:44 PM   #3
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Filling Joints between Flagstones


Use mortar.

Sanded grout is for interior ceramic tile floors.
Polymeric sand is to be swept between pavers.
Precision grout is used to set heavy machinery.
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Old 09-10-2010, 08:57 PM   #4
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Filling Joints between Flagstones


Thanks for the replies - sounds like mortar is the correct thing to use although I don't look forward to having to press or trowel mortar into every joint. I was hoping there would be a simpler solution like the polymeric sand which you can sweep into the joints and then wet to harden.

Can you do this with mortar. I could have filled the joints at the same time as laying the stone but I wanted to color the mortar.
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Old 09-11-2010, 12:28 AM   #5
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Filling Joints between Flagstones


use a grout bag. or a garbage bag with the corner cut off.
the mix should be fairly wet or it will be tough to get out of the bag.

If you can find a grout bag, you will understand how to use a garbage bag to do the same thing.
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