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Old 03-05-2008, 09:51 PM   #1
mestone
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heavy stone

Has anyone ever mixed thinset and mortar mix to hold up to 1/4-1/2 bed under stone? Stone is Penn. bluestone 18"x36"x1" border with 18"x18"x1"lueders limestone laid on diagonal Most of these stone need 3/16 -5/16 bed.I've used marble granite mix before seems to sag under some of the larger pcs.just looking for more input.This is outdoors on a large high-end home. area to cover close to 5000 sq.ft. I'm a stone mason.I get to do the heavier stuff most tile guys don't want to mess with around here.I love it.
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Old 03-05-2008, 10:25 PM   #2
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Mestone, Usually the granite marble mix by costom does a good job. You might try mixing it a little stiffer if the tiles are sagging. The only product I like better for setting stone is Tec 3 n 1. I'm not sure about exterior use of the 3 n 1, but I doubt it's any different than the granite marble mix. Your location is a factor if you're located in a freeze thaw climate.
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Old 03-06-2008, 04:58 AM   #3
scuttlebuttrp
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That's how I was taught to set any stone. We used white flex as a bond coat on the ground and back of stone; then mixed fatmud which was just stucco mix (9 sand/3 hi strength masonry; or 9 sand/2 masonry/1 portland).
Using this formula we set travertine on a pooldeck. Bed got 3" thick or more in some places. Never sagged once. Rock hard the next day. Talked to people who'd seen this pooldeck years later and it was still in perfect shape. This was in Florida though near the ocean, so no freeze thaw worries. But it was learned from a yankee so maybe he learned it up north?
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Old 03-06-2008, 07:08 AM   #4
Bill Vincent
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I've tried using real stiff thinset before. Sometimes it works, but sometimes it shrinks too much while drying, or the stone settles just a little bit. I've got two suggestions for you-- one is to use a medium bed mortar-- because of the heavier aggregate you can use it a little thicker than thinset. The other suggestion, if it even gets too thick for that, is to use thinset as a bondcoat on the back of the stone and on the floor, and then toss down some fat mud and press the stone into it until it's where you want it to be. Just make sure you have plenty of mud to fill under the stone, especially in the corners.
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Old 03-06-2008, 07:22 AM   #5
John Bridge
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Hi Mestone, Give us a first name, will ya?

I've used thin set mixed with synthetic wall mud about half and half, and I suppose regular fat mud would work the same way. Should be an excellent system considering we've set lots of stone with fat mud alone. I don't know about up north. I don't go there when it's cold.
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Old 03-06-2008, 07:37 AM   #6
John K
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Thinset on the slab, fat mud and thinset on the back of the stone. You said the stone is one inch thick. This is the best way I know of.
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Old 03-06-2008, 06:57 PM   #7
Davy
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That's the way I do it too. Thinset on the floor and on the back of the stone with fat mud in between, beat it down with a rubber mallet.
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Old 03-06-2008, 07:18 PM   #8
jdstone
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The rock guys here just use fatmud for their flatwork. Ive never seen bond coat with thinset, just the fat mud. Least all of em' that Ive seen on the upper ends. Far as I know, it seems to work without the bondcoat with heavy stone, but Id burn floor and backs regardless.
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Old 03-06-2008, 07:25 PM   #9
Bill Vincent
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Yeah, yer just suckin up ta John!!
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Old 03-06-2008, 07:37 PM   #10
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Tell em Bill, a real man would use a watery thinset and 1/8" v notch.
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Old 03-06-2008, 07:54 PM   #11
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Bill,,please stay out of our brown nosin' would ya....
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Old 03-06-2008, 09:37 PM   #12
mestone
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I've set alot of stone with fat mud only. learned it has to be full bed no furrowing holes under stone will loosen whole stone. This job can't build-up with more than1/4in. bed so I was thinking use a good modified thinset and add 3 parts sand to 1part type s mortar mix till I get the consistency I like. Thanks for all the input.Newbie here enjoying.
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Old 03-06-2008, 09:52 PM   #13
mestone
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Mike the name
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Old 03-06-2008, 10:04 PM   #14
Bill Vincent
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Mike, if that's all you have to come up, use a medium bed mortar and a 1/2x3/4" notched trowel. You'll have a good uniform setting bed, it'll have the tack and strength of thinset, and it won't let the stone droop because of the coarse sand.
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Old 03-06-2008, 10:57 PM   #15
mestone
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thanks Bill never used it but willing to try it. I suppose most tile supplies handle medium bed?
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