Moisture Resistant Drywall

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JohnJWJR
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Moisture Resistant Drywall

Post by JohnJWJR » Sat Apr 15, 2017 10:36 pm

I'm gonna be doing a complete renovation of my bathroom, ripping everything out to the studs. For the walk in shower I'll be using the Schluter-Kerdi Membrane, I want to use a moisture resistant drywall instead of concrete board, am I ok with "green board" or should I be using a different product, and what thickness would you recommend


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Shannon
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Re: Moisture Resistant Drywall

Post by Shannon » Sun Apr 16, 2017 12:04 am

Moisture resistant drywall is just fine under Kerdi. You want to use 1/2" drywall.
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mariasmith54
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Re: Moisture Resistant Drywall

Post by mariasmith54 » Mon Apr 24, 2017 5:34 am

Yes, the moisture resistant drywall will be good to use.

madonesi
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Re: Moisture Resistant Drywall

Post by madonesi » Sat Oct 07, 2017 1:55 pm

can you not use Kerdi Board as you are using Schluter products?

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Shannon
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Re: Moisture Resistant Drywall

Post by Shannon » Sat Oct 07, 2017 4:55 pm

Yes you can use Kerdiboard instead of drywall with Kerri fabric over it
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Re: Moisture Resistant Drywall

Post by madonesi » Sun Oct 08, 2017 3:45 pm

Shannon wrote:
Sat Oct 07, 2017 4:55 pm
Yes you can use Kerdiboard instead of drywall with Kerri fabric over it
Any negatives on using kerdiboard?

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Shannon
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Re: Moisture Resistant Drywall

Post by Shannon » Sun Oct 08, 2017 11:09 pm

Up front cost is more expensive and you may need to add some extra framing support. On the upside I think it is quicker then Kerdi fabric over drywall.
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AnnaM
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Re: Moisture Resistant Drywall

Post by AnnaM » Tue Oct 10, 2017 10:39 pm

That is a good decision. Moisture resistant drywall helps to prevent the growth of mold.

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Re: Moisture Resistant Drywall

Post by Houston Remodeler » Tue Nov 21, 2017 8:00 pm

MR board has a slight waxy coating which makes bonding kerdi fabric a little more difficult than it needs to be. Aside from the cost, there is no need for the MR board behind the kerdi. The MR board does little to nothing for the mold
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Shannon
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Re: Moisture Resistant Drywall

Post by Shannon » Tue Nov 21, 2017 11:07 pm

Houston Remodeler wrote:
Tue Nov 21, 2017 8:00 pm
MR board has a slight waxy coating which makes bonding kerdi fabric a little more difficult than it needs to be. Aside from the cost, there is no need for the MR board behind the kerdi. The MR board does little to nothing for the mold
What is the other layer between the tiles and the MR drywall? Almost looks like more drywall??
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Houston Remodeler
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Re: Moisture Resistant Drywall

Post by Houston Remodeler » Thu Nov 23, 2017 8:46 pm

More drywall. This is my competition. At this rate I'll work forever

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Re: Moisture Resistant Drywall

Post by Shannon » Fri Nov 24, 2017 9:21 am

I would agree somewhat ,I'm not sure MR drywall is a game changer in mould prevention. In Some places it is required in bathrooms. I think in your picture there was more of an issue with there being two layers of drywall. Once that first layer got wet and started growing it went right through to the MR drywall. IMO
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Houston Remodeler
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Re: Moisture Resistant Drywall

Post by Houston Remodeler » Fri Nov 24, 2017 5:38 pm

The manufacturer doesn't allow the use of MR board in wet areas unless covered with a membrane; 6. Not suitable for use as a substrate for tile in wet areas such as tubs and showers, gang showers and other areas subject to direct water exposure. 7. Use as a tile substrate is limited to tile installed according to the most current TCNA and ANSI specifications.

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Re: Moisture Resistant Drywall

Post by Shannon » Fri Nov 24, 2017 10:51 pm

Yes I understand that, My point is I wonder how it would have looked without the extra normal drywall over top of it.
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Re: Moisture Resistant Drywall

Post by A. Spruce » Sat Nov 25, 2017 12:24 am

In my experience, once the waterproof surface has been compromised, it doesn't matter what the substrate is made of, it's going to grow a layer of black mold and release the surface material. IMHO, most of the problem boils down to regular cleaning and maintenance of the surround. Those that get it last just fine, those that don't fail an untimely death.

I've seen the same problems with solid surface surrounds (cultured marble ), tile, FRP, Pionite, PVC, and other types of surfaces. Once the caulk fails, the substrate is soon to follow. Workmanship plays a part as well, but lack of cleaning and maintenance are the largest contributing factors of failure.
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Re: Moisture Resistant Drywall

Post by Shannon » Sat Nov 25, 2017 8:12 am

A. Spruce wrote:
Sat Nov 25, 2017 12:24 am
In my experience, once the waterproof surface has been compromised, it doesn't matter what the substrate is made of, it's going to grow a layer of black mold and release the surface material. IMHO, most of the problem boils down to regular cleaning and maintenance of the surround. Those that get it last just fine, those that don't fail an untimely death.

I've seen the same problems with solid surface surrounds (cultured marble ), tile, FRP, Pionite, PVC, and other types of surfaces. Once the caulk fails, the substrate is soon to follow. Workmanship plays a part as well, but lack of cleaning and maintenance are the largest contributing factors of failure.
I agree maintenance and cleaning is key to the long life of a shower.
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madonesi
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Re: Moisture Resistant Drywall

Post by madonesi » Tue Feb 13, 2018 4:49 pm

great topic.

What is the best way to seal a bathroom ceiling, if go wet room? Do you need to seal it like using Schluter products on walls or different?

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Re: Moisture Resistant Drywall

Post by A. Spruce » Tue Feb 13, 2018 5:08 pm

Can you elaborate? Typically, other than MR drywall, bathrooms are done no differently than any other room of the house, just standard drywall tape and mud for all joints and fasteners. If you have mold/mildew issues in this bathroom, then you can add mildew treatment to your paint, but ultimately, what you need is an exhaust fan to vent the excess moisture from the bathroom.
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madonesi
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Re: Moisture Resistant Drywall

Post by madonesi » Tue Feb 13, 2018 5:51 pm

A. Spruce wrote:
Tue Feb 13, 2018 5:08 pm
Can you elaborate? Typically, other than MR drywall, bathrooms are done no differently than any other room of the house, just standard drywall tape and mud for all joints and fasteners. If you have mold/mildew issues in this bathroom, then you can add mildew treatment to your paint, but ultimately, what you need is an exhaust fan to vent the excess moisture from the bathroom.
my bathroom is complete wet room, so open shower and large bath, steam room, so I am concerned with mold mildew issues. I will have schluter board and other products on walls and flooring to seal that up, but wondering if I should put up green drywall (MR) board on ceiling and thin Schluter board to seal it and then paint?

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Shannon
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Re: Moisture Resistant Drywall

Post by Shannon » Tue Feb 13, 2018 6:44 pm

By Schluter board I am assuming you are referring to Kerdi board? If this is actually a steam room then I would for sure use the Kerdi board and tile the entire room. I would also use an epoxy or urethane grout. Kerdi board can be used directly on studs if the studs are properly spaced( I believe no more then 16" O.C.)
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Re: Moisture Resistant Drywall

Post by madonesi » Wed Feb 14, 2018 10:14 am

I planned to use Kerdi board on all walls direct to studs and either go with the following option for ceiling;

1. Plywood and then MR drywall (primary due to lowering noise from above)
2. thinnest Kerdi board or kerdi membrane and then band to seal (I presume kerdi board is better for tiling and membrane if I go paint only?)
3. Then waterproof paint (I don't really want to tile the ceiling - but if its the best route due to wet/steam room then I will)

Appreciate feedback as this weekend I plan to do this area.

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Shannon
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Re: Moisture Resistant Drywall

Post by Shannon » Wed Feb 14, 2018 3:31 pm

You will never be happy with painting over Kerdi. At least I have never head of that and am not even sure its really possible? The ceiling would always be texture/rough looking, you will see every joint/edge and how would you ever clean it?Also once wet I'm sure the paint will fall right off. If its going to be a true steam room and used as such then tile really should be your choice. I would insulate the ceiling with Roxul safe and sound install kerdi board ,kerdi band and tile.
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madonesi
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Re: Moisture Resistant Drywall

Post by madonesi » Wed Feb 14, 2018 4:19 pm

Shannon wrote:
Wed Feb 14, 2018 3:31 pm
You will never be happy with painting over Kerdi. At least I have never head of that and am not even sure its really possible? The ceiling would always be texture/rough looking, you will see every joint/edge and how would you ever clean it?Also once wet I'm sure the paint will fall right off. If its going to be a true steam room and used as such then tile really should be your choice. I would insulate the ceiling with Roxul safe and sound install kerdi board ,kerdi band and tile.
thanks apprecaite this feedback, tile it is then :)

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