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Unread 10-12-2010, 02:51 PM   #1
K_Tile
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SLC over Backerboard

Looking to save cash and use backerboard as a filler for some deep areas in a residential, wood subfloor, SLC pour.

Thoughts:
1. Install board with thinset and screws, tape joints
2. Prime subfloor
3. Wrap subfloor and over edges of backerboard with lath
4. Prime again before pour.
5. Pour
6. Pick a color. Apply membrane.

Concerns:
Never poured over backerboard. Usually just poured more SLC for deep fill and never worried about it.

Has anyone had good results over backerboard?
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Unread 10-12-2010, 05:59 PM   #2
madronatile
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Seems to me that Slc flows about the same over any surface. Never had a good experience with it though, no matter how well I follow instructions.
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Unread 10-12-2010, 08:07 PM   #3
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should bond good.
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Unread 10-12-2010, 08:12 PM   #4
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You consider Lathing the wood subfloor and using some pea gravel as filler for the low spots with the SLC poured over all? I know some SLC manufacturers approve such tactics. Don't know all the requirements, though.

Seems it would be a lot easier than the CBU installation.
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Unread 10-12-2010, 08:56 PM   #5
Levi the Tile Guy
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I have poured SLC over 1/4" Durock and it worked just fine. I primered the Durock and didn't use lath. This was about 5 years ago and for a contractor I still work for, so I'm sure Ida heard if something went wrong.
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Unread 10-12-2010, 09:05 PM   #6
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Quote:
You consider Lathing the wood subfloor and using some pea gravel as filler for the low spots with the SLC poured over all? I know some SLC manufacturers approve such tactics. Don't know all the requirements, though.
posted x CX
are you getting gueuzesy on us Kelly?
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Unread 10-12-2010, 09:06 PM   #7
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Wat Cx said.

Don't forget about mud either though. I rather set on mud then slc any day..cheap and you can go deep.
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Unread 10-12-2010, 09:36 PM   #8
K_Tile
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We use pea gravel and polystyrene beads alot in deep pour commercial applications over concrete. Just finished up 10 pallets about a week ago. Pea gravel has to be mixed in the barrel with the SLC. Some think you can rake out gravel and pour the SLC over top but that is a no no!

I was concerned about the transition point from wood subfloor to backerboard edge. I didnt know if that edge would cause a stress point even with the use of lath.

Stick to what I know. One product.. one pour!
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Unread 10-13-2010, 06:34 PM   #9
pgc555
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I have used SLC over PERMABASE when doing floor heat systems and as long as you prime the surface it will bond well. The mat in the floor heat acts as the lath. I don't understand the guys here that have trouble with SLC's? Mix - pour ? Not really that tough.
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Unread 10-13-2010, 08:36 PM   #10
don s
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I install nu-heat pads on 1/4 " hardi and pour slc over it all the time and have had no problems, and I've done a lot of them.
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Unread 10-13-2010, 09:16 PM   #11
ceramictec
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I'm sure the labor you waste installing the CBU will offset just using all SLC

residential job, how many sq.ft. ? how deep ?
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Unread 10-15-2010, 02:17 PM   #12
scott anthony
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I recently did one Kelly mentions.
I had a 9 foot room sloped about 4 or so inch's, it was a delicious pitch.
All they wanted was close so we didn't need to be to fussy.
I took a slurry skim coat first then mixed pea gravel into more slurry, then troweled it similar to that of river rock. I drew out level lines so knew when to stop.
I then poured the SLC to a desirable finish.
We did that in no time, and the install went perfect, not to mention the supply cost was not bad at all either.
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Unread 10-15-2010, 05:45 PM   #13
Steve Taylor
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I would not recommend pouring SLU over backerboard. There is a good chance that there will be cracks where the boards come together, unless lath is used over the backerboard. Or, a good antifracture mat is used over the SLU. I do agree that pea gravel can be added to the SLU and poured over the wood floor with lath attached. This will stabilize any movement in the floor and eliminate the potential for cracks through the tile.
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Unread 10-15-2010, 06:40 PM   #14
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Quote:
Originally Posted by Scott
I took a slurry skim coat first then mixed pea gravel into more slurry, then troweled it similar to that of river rock.
A slurry of what, Scott?
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Unread 10-15-2010, 09:34 PM   #15
MarkTarkus
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Tangent: I have always wondered, how is pouring a thin layer of SLC over lath any different than a Jersey Mud Job? I'm just curious.
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