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Unread 05-21-2022, 05:54 AM   #1
qwertyjjj
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Wondering about tiling a deck.

Was wondering about tiling a deck but I'm not sure if the support is stiff enough.
Joists are 29" OC.
2 layers of 5/8" plywood.
Resisto membrane on top.
Thinking of using a decoupling membrane and then epoxy grout to avoid cracking.
Any thoughts?
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Unread 05-21-2022, 09:29 AM   #2
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Welcome back, Gordon.

Not enough information for a reasonable guess. And the first thing I would want is a geographic location in your User Profile.

Is this deck over occupied space?

You need first to evaluate the joists. What are they? What is the unsupported span? Etc.

Is the deck sloped away from the building structure?

Can you provide a link to the "Resisto membrane?" I'm not familiar. I'm doubtful, though, that it could be used in your application applied directly to the plywood subfloor.

I'm not engineer enough to determine whether your proposed subflooring would be sufficient, especially not knowing the width of the joists.

An uncoupling membrane might be helpful. There is no industry standard for such products, so it's difficult to say what benefit they might provide.

I don't see the epoxy grout being of any particular benefit in that regard.

My opinion; worth price charged.
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Unread 05-21-2022, 12:49 PM   #3
qwertyjjj
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Resisto is a bit like roofing elastomeric membrane
https://www.resisto.ca/en/products/waterproofing/

Nothing underneath just storage in an unfinished basement.
Joists are 3" thick.
Deck slopes away from the house.
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Unread 05-21-2022, 04:17 PM   #4
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So what is the height of the joists? And are they actually 3" thick? Are they two 2x joists stuck together?
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Unread 05-21-2022, 04:24 PM   #5
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Does the membrane meet the ANSI 118.10 standard for thin set loadbearing bonded waterproofing membrane for tile and stone applications?
Are you in a freeze thaw climate?
Is there any slope to the deck?
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Unread 05-21-2022, 04:31 PM   #6
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I see about a dozen products in your link, Gordon. Can you tell us which is installed on your deck?
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Unread 05-21-2022, 05:46 PM   #7
qwertyjjj
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They are 3" x 10", actually 3" like from 1910 old style.
Membrane is https://www.resisto.ca/en/product/mu...membrane-1879/

I am definitely in freeze thaw zone
The deck has a 2% slope.
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Unread 05-21-2022, 05:47 PM   #8
qwertyjjj
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Quote:
Originally Posted by qwertyjjj View Post
They are 3" x 10", actually 3" like from 1910 old style.
Membrane is https://www.resisto.ca/en/product/mu...membrane-1879/

I am definitely in freeze thaw zone - harsh winters
The deck has a 2% slope.
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Unread 05-21-2022, 06:52 PM   #9
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Gordon, 29" is an unusual spacing for joists. If that's the spacing for your deck, I think you'll likely be shy of the required deflection. Are you sure that's the spacing throughout the deck?

What condition are the joists in? Excessive knots, cracks, or rotting would mean they're even less likely to meet deflection requirements.
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Unread 05-21-2022, 06:53 PM   #10
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I wouldn't do it.
Joist spacing not good,dont even know length.
Membrane not rated for tile applications.
Uncoupling can hold water in cups and freeze.
Plywood moves allot.
Theres more but……
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Unread 05-22-2022, 07:02 AM   #11
qwertyjjj
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Length is 15' with a small beam underneath in the middle.
Yeah I know it's odd but that's how a lot of old houses are here.
In good condition, no rotting or anything.
It's elastomer membrane
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Unread 05-22-2022, 08:37 AM   #12
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Is that beam supported from below, at the ends, in the middle, or both? Do you see any sagging of the beam? How is the beam constructed?
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Unread 05-22-2022, 10:42 AM   #13
qwertyjjj
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No sagging but it's just some basic setup. It's a 4x4 supported by 2 6' metal posts resting on the concrete floor of the basement.
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Unread 05-22-2022, 10:50 AM   #14
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In the US, the TCNA has a procedure for tiling with joists up to 24" OC...I don't know of any that support it at 29". Deflection is composed of two parts, along the joist, and in between the joists. I don't know if two layers of 5/8" will provide enough strength to keep the deflection down between the joists. The calculator on the toolbar only goes up to 24" OC, so you'd need to use a differnt calculation to help with along the joists.
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Unread 05-22-2022, 10:08 PM   #15
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Gordon, the Deflecto doesn't allow for an input of 29" spacing, but even at 24" spacing with unknown wood in good condition, you would just barely be above the maximum deflection rating, so with 20% wider spacing I'd say you probably shouldn't rely on those joists to support tile.

Would you be able to put a 2x8 in every joist bay? That would likely get you there.

Of course, I'm just addressing one issue here. There may be others, I'm just trying to take one step at a time. You'd want to make sure you've mentally cleared any other potential hurdles before beginning this project.
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