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Unread 09-17-2013, 04:40 AM   #1
gwilkrrs
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best way to make up 1 1/2" from subfloor to finish floor in tile bath

so the guys at TOH sent me here for better advice...... I have an addition that is slab on grade, the living room side will have 3/4" plywood and 3/4" wood on the slab for a total of 1 1/2". the bathroom side of the slab therefore is 1 1/2" below finish floor height.
I plan on putting heat matt under the tile but don't know what else to do in order to make up the 1 1/2"? shall I do a thick thinset base with the matt embedded in it and a separate thick thinset base for the tile? or mud duro rock down then the matt then the thinset for the tile?
location=maryland
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Unread 09-17-2013, 04:52 AM   #2
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A thermal break of some kind, your heat mat, plastic lath, and deck mud.
Can't beat mud for price. It is a skill set though.
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Unread 09-17-2013, 06:25 AM   #3
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Welcome to the Forum

If you can add your location to your User CP it will appear on every posting which helps us recommend materials and methods.

Your floor heat manufacturer may have a recommendation on which thermal break to apply first. Then you can;

1- Set down the floor heat, sometimes peel and stick, sometimes hot glue gun
2- Pour SLC
3- Ditra or Ditra XL or Stratamat as an underlayment and height builder
4- thinset
5- tile.

You didn't say how large an area you're covering. If its of size, the SLC will get pricy but its easier for DIYers to do than float a deck mud bed as Joe describes. Floating your own floor is much cheaper.

Or you can hire a pro for some or all of the project.

1- What floor heat did you have in mind?
2- WHat tile did you have in mind?
3- Thoughts on grout?
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Unread 09-17-2013, 07:29 PM   #4
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thanks guys! so I doing my addition myself- the bath is 5'x18', she hasn't picked the tile yet but will likely be the small hexagon white and black to match the existing bath---- I haven't decided on floor mat's yet but had been looking at the home depot stuff.....
I am capable of floating out the floor if needed-
I suppose I need to buckle down and research this out-------
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Unread 09-17-2013, 09:02 PM   #5
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If you are using a tile under 2 inches, the ditra isn't recommended. Not sure about Stratomat having a minimum tile size. But if you float the floor, that's a non issue.
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Unread 09-17-2013, 09:10 PM   #6
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If you can mud it, do it. SLC would be expensive for a room that size. If you decide to mud it, check the flatness the next day. A skim coat of thinset will help fill any low spots that small tiles like to follow.
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Unread 09-18-2013, 05:43 PM   #7
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mud deck it is then. so the proper steps would be? and what mud should I use for this thick? thanks guys! I am a week or two out and sweating the unknown......
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Unread 09-18-2013, 07:03 PM   #8
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George,

The lye bury has a whole section on Deck mud / drypack. Making your own is quite simple, or you can buy it pre bagged. Read the relavent sections of the library.

We'll be here.

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Unread 09-18-2013, 07:22 PM   #9
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Like Paul said in post 3, I would check with your floor heat manufacturer to see at what stage to install the heat mat/wires. I have installed them in the mud bed but have also installed them over the mud bed, just under the tile.
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Unread 09-18-2013, 07:40 PM   #10
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Hire a pro to float the mud work and you do the tile. That's all contingent on finding someone who can and would be willing to just do the mud work and capable. It's a skill. I couldn't imagine doing mud work like that not having the skill set. I've had setters with me who do decent tile work but can't do mud work like you need.
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Unread 09-19-2013, 04:31 PM   #11
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The mud floor is similar to installing leveling plates and like concrete work- both of I have done....... I will look to the heating manufacure for location of mats.. I will research the steps more as well as to what goes on the slab first- mud or separator thermal break and heat Matt
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Unread 10-01-2013, 05:52 AM   #12
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is there an equation to figure out deck mud or shall I just use concrete formulas I know to get "close"
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Unread 10-01-2013, 05:58 AM   #13
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Deck mud needs to be 5 sand to 1 portland. Some guys like it about 4 1/2 to 1. Mix it dry and then slowly add water until it's damp. Grab a handful, it should hold together when making a ball in your hand. Check the liberry for more info.
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Unread 10-01-2013, 07:08 PM   #14
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sorry- I get the mix ratios- I meant for coverage ratios.....
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Unread 10-01-2013, 07:18 PM   #15
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You say your floor is 90 sq ft and you want to mud it 1 1/2 inches thick. A half cubic yard of sand will cover roughly 108 sq ft at 1 1/2 inches thick.
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