Durock Is Wrong Side Up

 
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Old 10-15-2008, 02:19 PM   #1
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Durock Is Wrong Side Up


I'm working on my addition and have a guy here (an employee) putting down the durock in the kitchen area. When I got home this afternoon he had about 60% of the area done BUT the rough side is down

Will this affect my tile in any way? I planed on using slate for the floors. The sheets say rough side for mortar and smooth side for mastic. He was thinking since the sheets were being put down in mortar that the sheets had to go rough side down. (it's been one of those days all day today!)
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Old 10-15-2008, 03:38 PM   #2
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Re: Durock Is Wrong Side Up


Jason,

That is not a problem, thin set will stick just fine to the smooth side.

Did you happen to check the deflection rating of your subfloor though? Natural stone requires a much stiffer subfloor than ceramic or porcelain, If it's not built for natural stone spec'd at the time, it most likely will not support slate.

Jaz

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Old 10-15-2008, 03:43 PM   #3
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Re: Durock Is Wrong Side Up


I agree... It shouldn't be a problem.

But I'd still smack him around a little...
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Old 10-15-2008, 04:10 PM   #4
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Re: Durock Is Wrong Side Up


Quote:
Originally Posted by JazMan View Post
Jason,

That is not a problem, thin set will stick just fine to the smooth side.

Did you happen to check the deflection rating of your subfloor though? Natural stone requires a much stiffer subfloor than ceramic or porcelain, If it's not built for natural stone spec'd at the time, it most likely will not support slate.

Jaz
Should be OK for deflection. I have 2 x 10's 16 o.c. spanning 17' with a triple 9 1/2" LVL in the middle of the span. Over that I put down 3/4" t & g Advantech sub flooring

I'm going to use 1/2" thick slate because there is also a wood stove going in it for heat. I don't think 1/4 would hold up to the heat.
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Old 10-15-2008, 04:11 PM   #5
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Re: Durock Is Wrong Side Up


Quote:
Originally Posted by ChrWright View Post
I agree... It shouldn't be a problem.

But I'd still smack him around a little...
Yeah, I busted his balls a little. He's got his wife on his mind lately, she's due any day now I have to cut him a little slack for that.
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Old 10-15-2008, 04:13 PM   #6
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Re: Durock Is Wrong Side Up


Purely in the interest of science, we once did
a shower half and half.
That was 10 years ago, and no problems so far.
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Old 10-15-2008, 04:17 PM   #7
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Re: Durock Is Wrong Side Up


Actually, when we used to use durock I usually installed it "upside down" because of the crowning of the sheets.

But, about this situation, I don't know if thicker slate will solve it, but around a wood stove the slate gets pretty hot. We had to rip up some a while back and replace with a ceramic "look-like" slate.

But tile around a wood stove is a great idea. Tile has great solar benefits.
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Old 10-15-2008, 04:34 PM   #8
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Re: Durock Is Wrong Side Up


Jason,

OK, so you're saying the joists span a little over 8' right? That's fine, but do you have a single layer of 3/4" Advantech subfloor? If so, not good.

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Old 10-15-2008, 04:39 PM   #9
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Re: Durock Is Wrong Side Up


Quote:
Originally Posted by neolitic View Post
Purely in the interest of science, we once did
a shower half and half.
That was 10 years ago, and no problems so far.

Some bosses even harp on their guys for not making sure the printed labeling all faces the same direction...

Reminds me of the old Phil Hartman SNL skit "The Anal Retentive Carpenter".

Miss that guy.
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Old 10-15-2008, 04:39 PM   #10
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Re: Durock Is Wrong Side Up


Quote:
Originally Posted by Jason W View Post
Yeah, I busted his balls a little. He's got his wife on his mind lately, she's due any day now I have to cut him a little slack for that.
And I suppose he's expecting a little time off for that to boot!

Are there no soup kitchens? :>)

Best wishes to both of them.

Good Luck
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Old 10-15-2008, 04:41 PM   #11
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Re: Durock Is Wrong Side Up


Quote:
Originally Posted by JazMan View Post
Jason,

OK, so you're saying the joists span a little over 8' right? That's fine, but do you have a single layer of 3/4" Advantech subfloor? If so, not good.

Jaz
Wouldn't the 3/8 durock applied w/ thin set help it? What should have been done? Not trying to argue but I've seen slate installed on less than what I'm doing it on. Do you think 1/4" slate will take the heat of the wood stove?
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Old 10-15-2008, 04:50 PM   #12
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Re: Durock Is Wrong Side Up


Quote:
Originally Posted by DavidC View Post
And I suppose he's expecting a little time off for that to boot!

Are there no soup kitchens? :>)

Best wishes to both of them.

Good Luck
Dave
I got him a box of condoms and the whole set of Gary Katz finish carpentry DVDs for his upcoming off time I hope he uses them both! He was one of our best installers on our exterior job in NY.
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Old 10-15-2008, 04:51 PM   #13
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Re: Durock Is Wrong Side Up


Quote:
Originally Posted by Jason W View Post
Wouldn't the 3/8 durock applied w/ thin set help it? What should have been done? Not trying to argue but I've seen slate installed on less than what I'm doing it on. Do you think 1/4" slate will take the heat of the wood stove?
Durock adds no structural strength whatsoever. Its sole purpose is a surface to bond tile/stone to. You should have a minimum of 1 1/4" of plywood in addition to meeting deflection standards for the joists.
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Old 10-15-2008, 04:58 PM   #14
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Re: Durock Is Wrong Side Up


Quote:
Originally Posted by PrecisionFloors View Post
Durock adds no structural strength whatsoever. Its sole purpose is a surface to bond tile/stone to. You should have a minimum of 1 1/4" of plywood in addition to meeting deflection standards for the joists.
The job we learned this on we ended up going back and adding another 3/4" ply from underneath, screwed and glued. Pain is the ass but fixed our problem and lesson learned. TCNA handbook since then.

Good Luck
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Old 10-15-2008, 04:59 PM   #15
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Re: Durock Is Wrong Side Up


Well that sucks! Back to the drawing board!

I was hoping to have the floor tile and counter tops made from the same stone. Their was no room for the extra layer any way.

I guess I'll be looking for porcalin now
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Old 10-15-2008, 05:01 PM   #16
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Re: Durock Is Wrong Side Up


Quote:
Originally Posted by DavidC View Post
The job we learned this on we ended up going back and adding another 3/4" ply from underneath, screwed and glued. Pain is the ass but fixed our problem and lesson learned. TCNA handbook since then.

Good Luck
Dave
Now there's an option! The dream is still alive
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Old 10-15-2008, 06:45 PM   #17
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Re: Durock Is Wrong Side Up


I vote for porcelain. It'll be much easier to maintained too.

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Old 10-15-2008, 06:52 PM   #18
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Re: Durock Is Wrong Side Up


Quote:
Originally Posted by JazMan View Post
I vote for porcelain. It'll be much easier to maintained too.

Jaz
Would I be OK with the floor the way it is? Could it take the heat from a small wood stove over it?

BTW thanks for all the help with this everyone I want to do this right.
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Old 10-15-2008, 07:08 PM   #19
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Re: Durock Is Wrong Side Up


Do you have a picture or link to the wood stove in question?

What's your source for the slate you were going to use? What format?
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Old 10-15-2008, 07:29 PM   #20
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Re: Durock Is Wrong Side Up


The stove is something similar to this but it's an antique that we found for half the price.

The slate is local Vermont slate. I was thinking about a 16" x 16" tile or 18" x 18" The kitchen area is roughly 16' x 15' wide open and no cabinets.

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