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Old 10-17-2018, 06:11 PM   #1
tileman1986
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Flushing out with bricks on exterior deck.

We are doing an exterior deck on a slab with 1/4 per foot slope built in.

They have already run a soldiers course of bricks on the perimeter.

What is the best way to build up the 3/4" we are needing to flush out with the bricks?


I have thought about using a layer of 1/2" durarock and 1/4" durarock. Thinset to the slab, fasten with concrete nails, thinset and tape seams.

I want to do it the right way and not have an issue. This is in southeast GA.

Thanks in advance.
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Old 10-17-2018, 06:25 PM   #2
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If the perimeter is already set, won't that define what level the field is to be set? What am I missing?
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Old 10-17-2018, 07:30 PM   #3
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If you need to raise it 3/4", a bonded mud bed is probably the best and least expensive way to do that.

CBUs outside, are usually not a great idea and quite a bit more expensive. You'd still need to bed them in thinset, adding to the cost.
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Old 10-17-2018, 07:34 PM   #4
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Is this just pavers on a slab patio? Why not just set them in sand and be happy? At least that's how ours was done a couple years ago, and it still looks like it was done yesterday.
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Old 10-17-2018, 07:51 PM   #5
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I'm sorry I left out the fact we are using a standard 12x24 porcelain.

The mudbed is not something I am very familiar with. I thought it had to be over an 1" thick..

Thanks.
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Old 10-17-2018, 07:56 PM   #6
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Ah! I saw the word "bricks" and jumped to conclusions!
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Old 10-17-2018, 08:08 PM   #7
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Well it sure made sense on paper!!!!!
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Old 10-17-2018, 08:09 PM   #8
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I would bond a mudbed like Jim mentioned. Before using any type of cement board, check to make sure it's approved for such use.
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Old 10-17-2018, 08:35 PM   #9
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A bonded mud bed will often work quite thin. A floating one needs enough thickness to support itself and hold together, but bonded to a slab, the slab provides the stability for a thinner application. Industry guidelines on a floating mud bed is 1.5" minimum with welded wire mesh embedded 1/2-way through it. No need for lath on a bonded mud bed.
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Last edited by jadnashua; 10-18-2018 at 02:18 PM. Reason: corrected lath to wire mesh
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Old 10-17-2018, 09:36 PM   #10
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What are the best materials and methods? Have Mapei and Custom available

Iím concerned about getting that large of an area flat. I donít have any old timers that work for me anymore who can do this type of mud work. Iím spoiled with my KBRS shower pans.
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Old 10-17-2018, 10:28 PM   #11
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For a large amount, it's cheaper to have sand and cement delivered in bulk and mix it yourself. You want a lean 5:1 ratio of sand:cement and enough water to make it hold together when you make a snowball.

If you lay out some gauge bars ( a couple of lengths of say 1/2" iron pipe might work), and throw the stuff down in there after spreading out a bonding agent, and then a long screed, you should be able to get it pretty flat. Then, you pack it down, pull the gauge bars out, pack that in, and you're done. Or, read up on the technique discussed in the pro forum. Getting a large area fairly uniformly wetted might be an issue, but it is easier to implement.
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Old 10-18-2018, 10:47 AM   #12
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If you're going to look for sand in bulk, look up a masonry supply and ask them if they have sand that a plasterer would use. Brick sand is a little too fine to work well.
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Old 10-18-2018, 11:35 AM   #13
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Quote:
Originally Posted by Jim
Industry guidelines on a floating mud bed is 1.5" minimum with lath embedded 1/2-way through it.
Just a point of clarification here: You do not want any metal lath in an unbonded mud bed. The requirement is for a welded wire mesh (several sizes will work) in the vertical center of a minimum 1 1/4" thickness, placed over a cleavage membrane.
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