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Unread 02-26-2013, 12:23 AM   #46
rjwz2
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Thanks for the pic Teddy.

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Unread 02-26-2013, 12:26 AM   #47
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Dana, it's on plywood. In the picture you can see the lighter solid colors is the paper backing with the adhesive stuck underneath.

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Unread 02-26-2013, 01:04 AM   #48
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Backbuttering tiles

When do you need to backbutter tiles? I'm using 13"x13" Porcelain on the floor on Ditra membrane and 13"x24" on the walls onto Redgard.

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Unread 02-26-2013, 07:20 AM   #49
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I think the suggested standard is at LEAST 95% coverage on a tile 15" or larger, so you'll definitely want to backbutter or burn in thinset on those 13"x24" tiles. For what it's worth I burn in thinset on every tile I set, even little 3X6 ones. I'm just a DIY'er though so I can do that an no one will complain about how long it takes me to tile (well, except for Mrs. Pete who really would like her new bathroom finished sometime in the near future).
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Unread 02-26-2013, 09:19 AM   #50
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Rob, for interior dry areas the industry standard calls for a minimum of an average of 80 percent coverage on the back of each tile with good coverage on edges and corners. For wet areas and exterior installations the requirement is for 95 percent coverage. For natural stone the requirement is 95 percent, plus some other restrictions, in all areas.

While it's possible to get the 95 percent coverage without keying-in or back-buttering, it's much easier and more consistent if you do at least key-in mortar on the backs of the tiles.

The coverage is what's important. Get it any way you can.

My opinion; worth price charged.
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Unread 02-26-2013, 11:56 AM   #51
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Rob.

Vinyl is typically installed over an underlayment layer, and we remove that layer along with the vinyl all at once.
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Unread 02-26-2013, 02:54 PM   #52
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Trowel size

OK, backbutter it is. What size trowel notches should I use?

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Unread 02-27-2013, 08:19 AM   #53
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"Rob.

Vinyl is typically installed over an underlayment layer, and we remove that layer along with the vinyl all at once.
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I guess I dont know how to quote a post on this site but hope this works?
I cant see all that vinyl subfloor or determine the scale of youir pic But I think you should listen to Dana and get that vinyl paper layer and adhesive out of your house! and hope your 2nd subfloor is not glued down to the base layer assuming there are tow layers??
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Unread 02-28-2013, 12:53 AM   #54
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Redgard on plywood

Can I use Redgard on my plywood floor before installing my tiles? This is under the old vinyl I ripped out. It is for a 1/2 bath that has only a toilet and basin. In the main bath I'll be using Ditra but for this I wanted to just go with the Redgard.

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Unread 02-28-2013, 09:44 AM   #55
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To what purpose, Rob?



Teddy, if you'll visit our FAQ you'll find a brief tutorial on how to post and properly attribute quotes here on the site. Very simple once you see it.
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Unread 02-28-2013, 11:34 AM   #56
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Redgard on plywood

To waterproof and have something for the tile to stick to? I read the info on the Redgard site but was confused on the part on using it on plywood.
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Unread 02-28-2013, 11:40 AM   #57
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Read the instructions some more, David.

You can use RedGard over exterior glue plywood on interior, dry installations as a crack isolation membrane. You cannot use it over plywood as a waterproofing membrane. If you want waterproofing, you must first install a CBU over your subfloor and then apply the RedGard.

If you're talking about using it over the plywood we see in your earlier photos, I would recommend against. If the plywood is suitable for a subfloor, I'd recommend you install a CBU over it as your tiling substrate. I see no reason at all to want to apply a waterproofing membrane on the floor of a powder room, but perhaps you see a reason not evident from out here.

My opinion; worth price charged.
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Unread 02-28-2013, 02:46 PM   #58
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Redgard on plywood

Thanks CX for clearing that up. Evidently I don't need the waterproofing in this particular area. It also looks like my floor may not be up to spec deflection wise. I have 2x8 joists on 24" centers and when doing the delfecto program, I need to beef up my flooring. Is adding cbu enough or do I need to add a layer of 1/2" ply first? If I need to go with both, that floor will come a lot higher than my other floors at the transition.

Does it make any difference that around 8 years ago I tiled my kitchen and dining area without adding ply to my floor and it is fine after all these years? Could it be just luck? I didn't know any better!

Thanks again.
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Unread 02-28-2013, 06:33 PM   #59
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I wouldn't tile it without more plywood, but it's up to you.
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Unread 02-28-2013, 06:52 PM   #60
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Okay, I'll do that. Do I screw only into the subfloor and not the joists? What about adhesive? Should I glue also?

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