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Old 01-23-2019, 08:02 AM   #16
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Re: Mortar recommendation for RedGard coated tile backer


Quote:
Originally Posted by Texasdiyer View Post
Based on the fact that you put up green board in the first place
Sorry but that's some seriously handicapped logic... me putting the greenboard excludes the idea of taking advice to redo it?

Quote:
Originally Posted by Texasdiyer View Post
If you're seeking advice why didn't you seek advice on using green board vs. CBU before you put it up ?
I did. Opinions are like @ss**oles everyone has one. And many people said its perfectly fine if its 100% sealed / vide attached YT clip and many others including water tests of board sealed with RedGard. I did my research but based on what I saw I was comfortable with the material I already had for other parts of the house. On the same note I'm not afraid to change / redo and take the advice to up the install with CBU (its delivered already and be up this weekend)

On the other note, you wrote a lot but not even one word that answers my initial question. EOT
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Last edited by misuszatek; 01-23-2019 at 08:21 AM.
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Old 01-23-2019, 08:19 AM   #17
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Re: Mortar recommendation for RedGard coated tile backer


Quote:
Originally Posted by firehawkmph View Post
The green board would be fine with just kerdi over it. Why not just do that since you already have the kerdi nitch? No need for redguard then. Trying to mix systems is not a good idea. Go with one or the other. kerdi is very easy to use, like wallpapering.
Mike Hawkins
Thank you,
Unfortunately, Kerdi is not worth the price in my opinion (I use Ditra on the floor but would rather use GB or CBU with RedGard on the walls) Why mixing the systems would make any difference if everything is sealed with liquid membrane? It was done numerous times without an issue. Did you see any fails caused by using Kerd+ RedGardi + CBU?




I don't think adding another layer is a good idea and I will explain why....

1. you would create 2 points of failure... if Kerdi will give in then I'm not better than just covering GB with RedGard.

2. I have a spot that doesn't meet with the rest of the drywall. Adding 2nd layer would make the gap (whatever right word for it) bigger and hard to use a trim.


This is what I'm talking about (BTW ..does anyone know where to get trim for CBU for this kind of situation?)
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Old 01-27-2019, 11:47 AM   #18
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Re: Mortar recommendation for RedGard coated tile backer


Since most were concerned about Greenboard instead of answering my question, here is an update (photo attached)

Now... can anyone answer my initial question?
What should I use for CBU/Kerdi patching and what should go over RedGard... modified or unmodified?
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Old 01-30-2019, 08:24 AM   #19
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Re: Mortar recommendation for RedGard coated tile backer


It is amazing how many replies full of criticism yet those criticizing have nothing to say when it comes to answering the actual question....nothing but silence


Anyway...
For those interested....I guess I will go with modified / Flexbond for joints and over RedGard. Just need to leave joints to dry very well before applying RedGard (recommended 48 to 72h for proper bonding).

For future reference, if anyone will be in the same situation / RedGard recommendation for tiling is to use modified.

Thanks to those who replied to help.
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Old 01-30-2019, 08:41 AM   #20
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Re: Mortar recommendation for RedGard coated tile backer


Quote:
Originally Posted by firehawkmph View Post
The green board would be fine with just kerdi over it. Why not just do that since you already have the kerdi nitch? No need for redguard then. Trying to mix systems is not a good idea. Go with one or the other. kerdi is very easy to use, like wallpapering.
Mike Hawkins
Kerdi specifically says not to use on greenboard. The paper is impregnated with wax which makes it less permeable to water but can also reduce the adhesion of thinset. Kerdi says regular drywall is an acceptable substrate. Also, do not tape and mud the drywall before applying kerdi. Drywall mud just liquifies when it gets wet again.
Drywall should be 3/4" as well for stiffness and to support weight of tile.
I don't know if Redguard is ok on greenboard.

Not so sure about Kerdi being easy. I find it a bit tricky to get the thinset mixed just right so it spreads smooth and thin.

Last edited by chiraldude; 01-30-2019 at 08:43 AM.
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Old 01-30-2019, 09:22 AM   #21
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Re: Mortar recommendation for RedGard coated tile backer


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Originally Posted by chiraldude View Post
Kerdi specifically says not to use on greenboard. The paper is impregnated with wax which makes it less permeable to water but can also reduce the adhesion of thinset. Kerdi says regular drywall is an acceptable substrate. Also, do not tape and mud the drywall before applying kerdi. Drywall mud just liquifies when it gets wet again.
Drywall should be 3/4" as well for stiffness and to support weight of tile.
I don't know if Redguard is ok on greenboard.

Not so sure about Kerdi being easy. I find it a bit tricky to get the thinset mixed just right so it spreads smooth and thin.
Thanks for your reply,

I replaced GB with CBU last weekend

As far as Kerdi... I will not apply Kerdi membrane. Only Schulter product is the niche. My plan is to mud joints with Flexbond over cement board fiber tape, dry it for 48+ hours and then apply few coats of RedGard over everything (including the niche).
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Old 01-30-2019, 09:38 AM   #22
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Re: Mortar recommendation for RedGard coated tile backer


All I can say about tile jobs is that the devil is in the details.
Substrate must be solid with good material compatibility to support the tile and block moisture penetration.
Then comes the tile fitting which is like a jigsaw puzzle where you have to change the alignment of the pieces to get everything to come out even.
Walls are never perfectly plumb, tubs and floors are never perfectly level. Put the grout lines in the wrong place and these will stick out like a sore thumb. Get it right however and you will have a work of art that you are proud of every time you step in the shower!
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Old 02-01-2019, 04:56 PM   #23
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Re: Mortar recommendation for RedGard coated tile backer


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Originally Posted by tribe_fan View Post
Not a pro - just have done a 4 showers. (3 of them the same one over a 20 year period - so I have had to correct my mistakes and see the results. Green board is useless in a wet area.



I don't think Redgard is approved (by them) to adhere to Green board, because of the makeup of green board. I would check with them before proceeding. It they say its OK you may have a shot with 3 careful coats.



CB with Red guard (or similar) over it is the way to go for DIY.



If i was the OP - I would cut out the bottom and replace with CB. Even 3 feet would help a lot.
I personally spoke to Custom Building Products about putting RG on drywall/greenboard in the bath to act as a moisture barrier. They confirmed you can spray or roll on said materials but suggested to thin and do 2-3 light coats. I've done some test areas recently w/ a 3-1 ratio RG/cold water and it adhered w/o any issue. I then did two test paints, one w/ direct w/ paint the other primer then paint. Both paint options adhered well and so far my test panel held up to the scratching and scuffing I tried to do.

As it has been beat to death, as I'm no pro and only have a few DIY bathroom jobs but I always use some sort of cement board.

I have friends in different regions of the US that do remodeling/construction and all say the same thing, any area that see's water like a shower/tub, use the cement/hardi board then RG or similar barrier which also doubles as a vapor barrier.
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Old 02-04-2019, 10:51 AM   #24
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Re: Mortar recommendation for RedGard coated tile backer


Thanks for the reply.

BTW Some progress over the weekend:
- 3 coats of RG over CBU
- Tiles up on one wall
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Old 07-22-2019, 11:49 AM   #25
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Re: Mortar recommendation for RedGard coated tile backer


Quote:
Originally Posted by misuszatek View Post
Thanks for the reply.

BTW Some progress over the weekend:
- 3 coats of RG over CBU
- Tiles up on one wall
How much coverage are you getting from a gallon? I have a huge walk in shower.
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Old 07-22-2019, 06:33 PM   #26
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Re: Mortar recommendation for RedGard coated tile backer


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Originally Posted by Bryan n Deb View Post
How much coverage are you getting from a gallon? I have a huge walk in shower.
1Gal was good for about 3 layers (using roller).
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Old 07-23-2019, 11:12 AM   #27
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Re: Mortar recommendation for RedGard coated tile backer


Im glad you replaced the drywall with a proper substrate. It is a better product all the way around.

Last edited by lug-nuts; 07-23-2019 at 11:14 AM.
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Old 07-25-2019, 02:35 PM   #28
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Re: Mortar recommendation for RedGard coated tile backer


I am glad I did. Now I know that its solid.
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Old 07-26-2019, 11:44 AM   #29
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Re: Mortar recommendation for RedGard coated tile backer


Beautiful, it will last for a very long time. Nice work.
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Old 08-05-2019, 07:43 PM   #30
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Re: Mortar recommendation for RedGard coated tile backer


Versabond as mentioned is the best thinset to use with a fracture guard coating. The purpose of the coating is usually in situations where it helps to have the tile able to move slightly when there is movement of the underlying structure to keep the tile from cracking. The larger the tiles the greater the risk of one cracking.
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