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Old 01-10-2018, 09:42 AM   #16
Topspin
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Just use that 3/4” ply. Nail some strips of whatever thickness you want to top of cabs, then mount your 3/4 ply to that. Then use the 3/4” ply or your choice thickness ply to face to give you the look of the thickness you want to mount your face tile to. It’s a snap.

2nd tossing old Hardi out. Whatever you get at Home Depot will be too big for your golf cart, so rent their truck for an hour or two and bring home your ply, backer, strips, and your other big items a property mgr needs to pick up for the association- maybe you’ll get your truck rental covered by the association. Two wins.
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Old 01-11-2018, 08:42 AM   #17
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Question

OK. My question remains WHICH plywood to buy?
I'm going to go the "official" Schluter method of 3/4" plus 5/8" plywood (19/32" is all I can get) plywood with Ditra on top. I'll be 1/32" short of 1-1/2" thick. With a little luck the 19/32 will be close to .5937 5as it should be and not as Home Depot's website seems to indicate only .46 thick Or I'll need to find another way. This also fits my trim tile I have here.

In any case are these the correct type and grade of wood? First one is PT ground contact 3/4 SYP ; second one says is also PT SYP and exterior grade, but not ground contact which makes no difference to my application which will not get wet under Ditra. Are these OK? Home Depot's selection is crap but Lowes is worse and about 25 minutes further away to drive with this stuff on the roof. Thanks for the advice. Not looking forward to strapping it to a car roof like that however it's going to be only way to get this stuff home.

https://www.homedepot.com/p/3-4-in-x...6128/206971071

https://www.homedepot.com/p/19-32-in...6081/100004472

OH. HOA will have materials delivered professionally or another method so rent-a-truck is not an option.
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Old 01-11-2018, 09:29 AM   #18
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Home depot truck rental is $20 for the first 70 minutes.

I ended up getting a truck from hd and my ply from lowes. They had much nicer wood in their indoor lumber yard. Bcx or acx should have no voids and be suitable for tiling.

I thought the thickness requirement was 1.25" not 1.5 and that was for flooring from the tile association. Schluter specifies installing over as little as 3/4" depending on joist spacing.

Both of your links are for sheathing and 1 is pressure treated. Neither of these are suitable.
This is more what you would be looking for.

https://www.homedepot.com/p/23-32-in...6057/100061386

It's not so much exterior grade ply you are looking for as exterior glue that it is made with.
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Old 01-11-2018, 10:37 AM   #19
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Schluter's video says 3/4" plywood and 5/8" plywood plus 1/8" Ditra for 1.5" thickness. https://www.youtube.com/watch?v=cgLcwG0o__4

I just measured my tile trim and it measures a bit over 2" but it has a rounded inside end so 2" should be enough.

UGH! This makes my wood choice more complex. I actually bought this trim for my kitchen but I can get it for the bathroom too. I will never do my own front pieces again.
Did it once and it looks like shit. But now

Rent-a-truck is also not an option at all at my local Home Depot so that is a moot deal. It's an old old store without even a tool rental shop.
If they have one truck I've never seen one.
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Old 01-11-2018, 11:08 AM   #20
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They made it 1.5 to match their shluter edge strip in that video.

Since you are making a 22x48 countertop you would get a sheet or half sheet of what i linked cut to 22x48 and that should fit in most vehicles.

Double it up. That gives you 46/32
Stick 15/32 bcx or better on top and you get 61/32plus 4/32 ditra brings you 1/32 over two inches.

I might skip the half inch on top ymmv
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Old 01-11-2018, 11:51 AM   #21
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Yes that is true they used 1.5" to match their edging profile. And I did not realize this trim was a full 1/2" thicker still.

I have been doing those very calculations and came up with same issue 1/32" over 2" which might be OK or not. I obviously do not want any of the wood or Ditra to show when I'm done.

So I get this one for the 15/32 plywood? And have to get it cut. IF they will cut it as needed that should work out ok. https://www.homedepot.com/p/15-32-in...6030/100012720

I hope the thickness shown there is not .47 and is only rounded off.
That would put me 1/16 thick not 1/32 and on hairy edge of the ditra showing at
the edge of the trim.
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Old 01-11-2018, 12:15 PM   #22
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Or some 3/8

Or take trim to store and stack wood till it fits.
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Old 01-11-2018, 09:36 PM   #23
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Thumbs up Q

Quote:
Obo2 Or some 3/8

Or take trim to store and stack wood till it fits.

Thanks. That is a great idea!
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Old 01-20-2018, 01:40 PM   #24
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Question Three layers of plywood

OK. I have Ditra and Kerdiband for the countertop now I need to get the wood
and rest of supplies.

How do I screw the layers together? Deck screws I'm certain, but do I put all three together as one or attached the first to the vanity then the second layer to that and third on top? I think I need to also glue the layers together?
There will be a sink opening of course which I will need to cut out.
To begin I'm going to get 1-5/8" screws which are longest under 2" length
I can get.
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Old 01-20-2018, 07:52 PM   #25
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Question

I have the wood and had it cut at Home Depot. Of course I screwed up!
I had them cut to 4 feet x 22" so I could double up the 23/32.
Well I missed something important about my original countertop it had a backsplash which was an extra 1.25" thick so the correct length
would be 49-1/4". This screw up makes my new countertop be flush with side edge of the cabinets rather than have an overhang.
I will compensate this with a scrap against the wall that I will scribe to be same height as the reset of the wood and then screw to the rest
with wood screws. That will give me a 23/32 over hang of the cabinet which is plenty.

My question now is about the variations against my wavy wall. I'm aligning
the wood layers to they are square on the exposed edges, but there are up to 1/8" gaps at the wall between the wood cut variations and
the wavy wall. How do I fill them? Can I put some thinset in there when I'm installing the Ditra?
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Old Yesterday, 11:30 PM   #26
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Question UGH! After glue up wood base is bowed

Whelp! I glued the 2 x 23/32 and 2 x 15/32 plywood sheets together
using Tightbond III between each layer and 1-5/8" deck screws.

The plywood seemed pretty flat before, but now with a 4 foot level it has a
~3/16" low spot "bow" at 2' along the 4 foot length.

This will be where the sink opening lies however the bow still concerns
me for how much it will remain once the sink opening is cut. It is a
self rimming sink. Tiles are 6x6. The vanity base has corner blocks to
secure the countertop in place.

If any of this bow remains once the sink opening has been cut how would
I best correct it prior to installing the Ditra? Can I skim coat the wood to
with thinset to make it flat as possible?
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Old Today, 12:23 AM   #27
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Did you glue it up as you installed the plywood pieces, or is the plywood yet to be installed to the vanity?

If yet to be installed, then some of the bow may come out during installation if your supports are all in plane and frequent enough. If it's already installed, perhaps one of your supports was out of plane?

Cheers, Wayne
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