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Old 06-16-2014, 02:23 PM   #1
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i'm laying a flagstone patio about 10 x10 with walkway and brick edging....i'm planning on putting a 4" base down first with compacted crushed stone! i'll compact 2" at a time to make sure the surface is completed solid before laying flagstone. I was wanting to mortar flagstone to the compacted stone to keep from moving and then mortar the joints between stone.

Has anyone done this before and did it last a while?

thanks,

lionscorp

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Old 06-16-2014, 03:07 PM   #2
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Welcome...it's been done but I don't think you need to go that far.

Do your 3-4" of compacted stone....then 2" of sand on top of that...screed it real well using a 10' 2x4'. If you wet it as you go you compact the stand real well.

I have 6"x 6" pavers....NO movement at all. The stone goes a long ways to giving you a stable base.

They make a sand for filling in the cracks. You spread it out....pack it in with a broom...and then when you wet it....it pretty much turns to cement.

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Old 06-16-2014, 04:09 PM   #3
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I have never heard of compacting stone in two lifts. I would think it would mesh better if you went over it longer with one lift instead.
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Old 06-16-2014, 06:17 PM   #4
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I've never heard of wet laying flagstone on a gravel bed, however I have set them in stone dust and mortared the joints with decent success. The joints have cracked and moved a little through the years, but it did it 10 years ago. That said, it was only at my own house, I don't think I'd use this method at a customer's residence........
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Old 06-16-2014, 06:53 PM   #5
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Quote:
Originally Posted by lionscorp View Post
i'm laying a flagstone patio about 10 x10 with walkway and brick edging....i'm planning on putting a 4" base down first with compacted crushed stone! i'll compact 2" at a time to make sure the surface is completed solid before laying flagstone. I was wanting to mortar flagstone to the compacted stone to keep from moving and then mortar the joints between stone.

Has anyone done this before and did it last a while?

thanks,

lionscorp

I don't think i'd mortar the flagstone to the stone bed, and instead of mortar for the joints, i'd use polymeric sand.
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Old 06-16-2014, 10:37 PM   #6
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Originally Posted by Canarywood1 View Post
I don't think i'd mortar the flagstone to the stone bed, and instead of mortar for the joints, i'd use polymeric sand.
That would be my choice also.
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Old 06-16-2014, 10:53 PM   #7
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Robpo is completely out in left field, pay no attention to him.

There are 2 kinds of pavements:

Rigid, such as a wet laid flagstone on a concrete slab with appropriately specified mortar filling the joints.

Flexible, such as flagstone laid in a crushed stone bed on leveling sand with joints filled with either sharp sand or aggregate based upon the joint size, or a polymeric aggregate filling the top section of the joint.

Any mix of the 2 will lead to failure of either the mortar joints between the rock, or failure of the bedding material.
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Old 06-17-2014, 09:52 AM   #8
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Thanks guys for all your input on the flagstone issue! The main reason i was going to wet lay the flagstone on crushed stone is for one to save customer money and not pour concrete and two there's about 12 foot of
existing sidewalk that i'm mortaring flagstone onto. I wanted to come off
the sidewalk and continue with flagstone patio which if i first compacted it
solid then wet lay the flagstone it would have a better chance of not moving
in future with mortared joints as well.

The edging will be done in brick around sidewalk and patio to give it more depth and stability.

your thoughts!

Lionscorp
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Old 06-17-2014, 04:52 PM   #9
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You are trying to blend a flexible pavement system with a rigid one. It will fail, simple as that. Pick one or the other.
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Old 06-17-2014, 06:13 PM   #10
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http://www.pavingexpert.com/pccflag1.htm
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Old 06-17-2014, 08:51 PM   #11
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Stuart, that is not flagstone, it is pavers.
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Old 06-17-2014, 10:18 PM   #12
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a word of caution. polymeric sand has issues, sometimes. google it first.
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Old 06-17-2014, 11:12 PM   #13
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It doesn't have issues, it is mis-used. When used within specifications it or almost anything will perform as advertised. As with the original poster, when you ask a design to perform beyond it's specifications, it will fail. The shame is that the product is then blamed for the failure, even though it was not used within it's design envelope.
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Old 06-18-2014, 04:59 AM   #14
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Stuart, that is not flagstone, it is pavers.
yes sorry, wrong page. Scroll down to laying flagstones, it's a reaaly big website.
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Old 06-18-2014, 09:44 AM   #15
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This is what is known in the US as "flagstone":

http://www.pavingexpert.com/crazypav.htm

And as you can see, they list 2 types of bedding for this, just as I described above, although even 10:1 sand:cement is not really good.

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