How do you finish joint between cement board and drywall?

Spread joint compound over the length of the tape with a 6-inch drywall knife. Make the seam just wide enough to cover the entire surface of the tape (generally 3 inches). Get it smooth and flat. Dab additional compound over the screw holes on both the drywall and cement boards, near the seam but not under the tape.

Do you have to tape backer board seams?

For tile backer boards such as Durock, Wonderboard, Hardiebacker, Permabase, and others the seams between the board need to be treated with 2-inch alkali-resistant mesh tape.

Do you tape drywall joints before tiling?

If you’re working with new drywall, there’s no need to tape the drywall joints. Seal the walls with a skim coat and let it dry thoroughly. Sand with a medium-grit sandpaper to create a uniform surface that’s not too smooth. You want the tile adhesive to have something to grab onto.

Can you attach cement board to drywall?

In such wet areas, never install cement board directly over drywall or green board. Instead, first, remove the existing surface material, then install the cement board over the studs and membrane, as applicable.

How do you fill gaps between cement boards?

Youtube quote:I recommend that you get cement or tape mainly because it sticks to cement board better.

How do you finish the edge of cement board?

Youtube quote:But this is actually made for cement board so you basically just get it in the corner like you normally would if you've done any sheetrocking before and taping it's self sticking.

How do you seal seams on backer board?

Youtube quote:This area right here what you wanna do is you want to take some of the thin set mortar you want to just put it on the teeth and then sweep it off so that you get a nice thin layer on the teeth.

Do I really need thinset under backer board?

Use thin-set mortar when installing cement backer board. Thin-set dries slowly, allowing you to fix and readjust backer board sheets as needed. The ingredients in thin-set mortar ingredients are cement, fine sand and a water retaining agent.

How do you transition from durock to drywall?

Youtube quote:And we have our moisture resistant drywall this could be anything this could be some cement. Board any kind of uh tile backer board would you find.

Can I put durock over drywall?

Yes. Make sure it is securely fastened with rust resistant screws if you plan to put tile over the cement board in a wet area . It is also a good idea to first put a heavy plastic sheeting like 4 or 6 mil plastic over the drywall if this will be a wet area .

Is cement board the same as drywall?

Drywall is made of gypsum – a naturally occurring mineral that is non-combustible, making it great to use in homes. It has a gypsum center and paperboard outsides. Cement board is also somewhat mineral-based. It usually has a cement mortar center and a fiberglass mesh cloth shell.

Do you need green board behind cement board?

So, remember green board for damp areas but cement board for all areas that could possible come in direct contact with water to ensure the longest life of your bath and tile needs.

What’s better cement board or green board?

Cement backer board such as Durock is best used for tile in highly wet applications such as shower stalls, with greenboard and other water-resistant drywall panels kept only to high-humidity areas. Greenboard’s paper facing alone does not inhibit mold growth. The facing must be treated with mold-resisting agents.

Do you need to use Redgard over cement board?

Grout is porous, sealing it won’t protect you. Also, You need one vapor barrier either behind it or over it. Redguard would be an over it application.

What is waterproof Sheetrock called?


Greenboard is a water-resistant gypsum board or drywall panel that came out in the 1960’s. The product is essentially a more durable gypsum board. It has the same gypsum core that you’ll find on standard drywall all over homes, but it comes with a thicker coating of paper that’s protected by wax for water resistance.

Is purple drywall waterproof?

While all drywall is naturally fire-resistant, PURPLE drywall is unique because it also resists moisture, mold and mildew. Some PURPLE drywall products also stand up to scratches, scuffs, dents and sound. This means added value and peace of mind regardless of steamy showers, roughhousing kids or band practice.

Is purple drywall better than Green?

“Green drywall (also known as greenboard) is only moisture-resistant. PURPLE®drywall, only made by National Gypsum, is superior because it offers moisture, mold and mildew resistance. In addition, many PURPLE® drywall products offer added benefits, including resistance to scratches, scuffs, dents and sound.

What is the difference between green and purple drywall?

But, the difference is that it has a thicker paper coating with a wax covering for water resistance. You should consider this type of drywall in areas with high levels of moisture or humidity. However, don’t mix moisture-resistant drywall with waterproof drywall as they are not the same.

Where should you use PURPLE drywall?

Purple Drywall

It can be used with all wall and ceiling applications and is ideally suited where enhanced moisture and mold resistance is desired. If it is going to be in contact with water, this is the one to use.

What is better sheetrock or drywall?

No, there is no difference between Sheetrock and drywall. Sheetrock would likely be the standard for what drywall should be. If you see in a tutorial that you should use Sheetrock, you can use any type of drywall available to you. Whether the drywall will be as high quality as Sheetrock is a different question.