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Best Method Of Filling Dip In Floor

 
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Old 05-13-2019, 08:00 PM   #21
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Re: Best Method Of Filling Dip In Floor


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Why would it matter? The leveler is to fill the void. The crack shouldn't affect anything above it. Remember, the Romans laid tile on sand and it has lasted a very long time.
Cracking leads to crumbling and movement. As I read it, he was concerned about it.
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Old 05-13-2019, 08:42 PM   #22
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Re: Best Method Of Filling Dip In Floor


Set lath prior to the pour. I use Maple plastic lath. Don't forget to prime the floor.

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Old 05-13-2019, 08:47 PM   #23
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Re: Best Method Of Filling Dip In Floor


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Cracking leads to crumbling and movement. As I read it, he was concerned about it.
No it doesn't. If a slc cracked under a sheet of backer how would that telegraph through the backer? You do realize much of the thinset bond is broken between the backer and subfloor after just a few years?

Movement also doesn't magically happen if there is a crack. Movement happens regardless. What you meant was the crack would allow for movement in that particular area, but that also doesn't mean there would be crumbling or additional movement. Crumbling would only occur if there were air voids. SLC doesn't leave much room for air.
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Old 05-13-2019, 09:43 PM   #24
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Re: Best Method Of Filling Dip In Floor


Anyone still do "deck mud"?

Just a dryer-ish type S mortar, if I remember correctly?
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Old 05-13-2019, 09:46 PM   #25
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Re: Best Method Of Filling Dip In Floor


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Anyone still do "deck mud"?

Just a dryer-ish type S mortar, if I remember correctly?
https://floorelf.com/how-to-make-deck-mud

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Old 05-13-2019, 09:57 PM   #26
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Re: Best Method Of Filling Dip In Floor


I'm thinking about nailing down the backer board, painting on a thinset slurry, and leveling it off with deck mud.

Then tiling over that.

Any thoughts?
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Old 05-13-2019, 10:06 PM   #27
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Re: Best Method Of Filling Dip In Floor


I don’t think you’ll be able to bend the board enough. I like to see all leveling done prior to getting to the surface to be tiled.

Cut up backer pieces, nail down a couple of layers in the low spot. Use SLC or deck mud to fill the voids.

Place the backer board over the repair and balance of the floor. Nail through the backer into the patch avoiding the filler.

For the record, I’d be using Ditra on this job. I’m to old and feeble the move backer board.

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Old 05-14-2019, 06:39 AM   #28
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Re: Best Method Of Filling Dip In Floor


I have all of my floors done with mud to avoid all of these issues. I use sand topping to preslope but it the setters don't mix their own they use type S mortar. Actually quite different since they don't add sand.

One of these days I will try it myself as the quality of the hired help is declining I feel the need to tackle more than I want
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Old 05-14-2019, 07:13 AM   #29
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Re: Best Method Of Filling Dip In Floor


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Originally Posted by TNTRenovate View Post
No it doesn't. If a slc cracked under a sheet of backer how would that telegraph through the backer? You do realize much of the thinset bond is broken between the backer and subfloor after just a few years?

Movement also doesn't magically happen if there is a crack. Movement happens regardless. What you meant was the crack would allow for movement in that particular area, but that also doesn't mean there would be crumbling or additional movement. Crumbling would only occur if there were air voids. SLC doesn't leave much room for air.
Yup, it would probably be fine. And so would just filling it with some thinset the day before.
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Old 05-14-2019, 04:42 PM   #30
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Re: Best Method Of Filling Dip In Floor


Over a crawl space, or second story? What's the framing specs, and what "L" specs are available?
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Old 05-15-2019, 07:45 PM   #31
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Re: Best Method Of Filling Dip In Floor


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Yup, it would probably be fine. And so would just filling it with some thinset the day before.
Fill what with thinset?
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Old 05-15-2019, 08:02 PM   #32
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Re: Best Method Of Filling Dip In Floor


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Fill what with thinset?
The low spot, and screed it off. or SLC..whatever's on hand.
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Old 05-15-2019, 08:21 PM   #33
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Re: Best Method Of Filling Dip In Floor


I think itís time to call in Tipi and put this job in the books.
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Old 05-15-2019, 08:29 PM   #34
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Re: Best Method Of Filling Dip In Floor


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I think itís time to call in Tipi and put this job in the books.


You want Tipi to strip for you?
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Old 05-15-2019, 08:56 PM   #35
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Re: Best Method Of Filling Dip In Floor


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Over a crawl space, or second story? What's the framing specs, and what "L" specs are available?
3" x 16" full dimension joists @ 16" O.C. 24' span.

125 year old building.

Floor is solid, not a bit of flex.

There is several layers of flooring in the place, some tested hot for asbestos. Not sure what caused the dip, but it's not rot, and it's not moving at all.

I'll be tackling this tomorrow.
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Old 05-16-2019, 08:42 AM   #36
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Re: Best Method Of Filling Dip In Floor


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The low spot, and screed it off. or SLC..whatever's on hand.
The low spot is more 1/4" you cannot use thinset to fill. Medium set is no more than 3/4". So no, you cannot use whatever's on hand. There is a reason for manufacturer's guidelines and industry standards.
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Old 05-16-2019, 08:48 AM   #37
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Re: Best Method Of Filling Dip In Floor


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The low spot is more 1/4" you cannot use thinset to fill. Medium set is no more than 3/4". So no, you cannot use whatever's on hand. There is a reason for manufacturer's guidelines and industry standards.
What's going to happen to 1" of solid thinset, let's say Versabond for the sake of discussion?

A 5x5 depression, deepest point at 1", would be filled just fine with thinset. You won't read that on the label, but it'll be just fine, especially with cement board over it.

Last edited by MarkJames; 05-16-2019 at 08:55 AM.
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Old 05-16-2019, 09:04 AM   #38
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Re: Best Method Of Filling Dip In Floor


HD sells pre-bagged deck mud.
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Old 05-16-2019, 12:49 PM   #39
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Re: Best Method Of Filling Dip In Floor


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What's going to happen to 1" of solid thinset, let's say Versabond for the sake of discussion?

A 5x5 depression, deepest point at 1", would be filled just fine with thinset. You won't read that on the label, but it'll be just fine, especially with cement board over it.
No it won't. Thinset shrinks. You should really understand the science behind mortars and how they cure before dolling out advice. As it cures it will shrink and pull away. It will also take forever to dry and cure. Why do you think they make medium set and LF Mortars? Thinset isn't a term used for all mortars but a specific type of mortar with a specific application.

So no, it won't be fine and there is a very good reason it isn't on the label, it won't work and goes against all science, standards and best practices.
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Old 05-16-2019, 12:59 PM   #40
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Re: Best Method Of Filling Dip In Floor


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No it won't. Thinset shrinks. You should really understand the science behind mortars and how they cure before dolling out advice. As it cures it will shrink and pull away. It will also take forever to dry and cure. Why do you think they make medium set and LF Mortars? Thinset isn't a term used for all mortars but a specific type of mortar with a specific application.

So no, it won't be fine and there is a very good reason it isn't on the label, it won't work and goes against all science, standards and best practices.
They can't adjust for experience on labels. If you wait for day 2 to put down the board (after any shrinking), it's going to be fine. This isn't rocket science. But if you want to splurge for SLC, certainly no qualms with that.

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