Cement Board vs Dry Wall

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Cement board is composed of aggregated Portland cement with a glass-fiber mesh on the surfaces. This 5/16 inch (7.9 mm) thick cement board is designed as an underlayment for tile floors. These are 3 by 5 foot (91 by 152 cm) sheets

A cement board is a combination of cement and reinforcing fibers formed into 4 foot by 8 foot sheets (or 3 foot by 5 foot sheets), 1/4 to 1/2 inch thick that are typically used as a tile backing board. Cement board can be nailed or screwed to wood or steel studs to create a substrate for vertical tile and attached horizontally to plywood for tile floors, kitchen counters and backsplashes. It can be used on the exterior of buildings as a base for exterior plaster (stucco) systems and sometimes as the finish system itself.

Cement board adds impact resistance and strength to the wall surface as compared to water resistant gypsum boards. Cement board is also fabricated in thin sheets with polymer modified cements to allow bending for curved...

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When you're building a tub/shower surround, there are two questions that need to be answered:

Which substrate material should I choose? How do I waterproof it?

The answer to question #1 is easy. Cementboard, always (unless you're using a fully-integrated system like Kerdi, but if that's the case, you're probably not asking the question here). Not drywall, not greenboard. Always use cementboard.

Question #2 has a variety of answers, but it needs some answer. You can't have no waterproofing layer, because neither cementboard nor tile are waterproof. They are not affected by water, but they will transmit it through themselves to whatever is below, which is probably wood if you're in the USA. Not good. The wood will rot and grow mold and termites will eat it. So you need some kind of barrier to keep the water off the wood. Once you've committed to using cementboard, painting it with RedGard or a similar product is a popular and effective approach. A more old-fashioned one...

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Cement board is one of those neat home remodeling inventions of the 20th century that makes your tiling project go faster and look better in the end. Why is cement board so great for some remodel projects? Where and how do you install it?

What Is It?

Cement board is now commonly called a cementious backer unit (CBU), CBUs are 100% inorganic, meaning that, unlike wood-based materials such as drywall, greenboard, or plywood, there is no organic matter that will promote mold, rot, shrinkage, or decomposition.

Cement Board vs. Drywall

To understand cement backer board, you should first look at its cousin--drywall. For years, interior walls were finished with lath (wood strips) and plaster laid over the studs. Plasterers used hundreds of pounds of plaster, trowel by laborious trowel.

Then someone got the brilliant idea of pressing all of that plaster, plus the structural qualities of the lath, ahead of time in a factory--in the form of sheets of...

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What is Drywall?

Drywall is a panel made of gypsum plaster sandwiched between thick paper. It is used in the construction of interior walls and ceilings as a replacement for the traditional lath and plaster method. Other names for drywall panels are plasterboard, wallboard, gypsum board, gyprock, and Sheetrock.

What is Sheetrock?

Sheetrock is a brand of drywall, though because of its popularity, the term has come to be used interchangeably with drywall. Sheetrock is also used as a replacement for lath and plaster in the construction of interior ceilings and walls, though some Sheetrock is weatherproofed for exterior ceilings.

Only the U.S. Gypsum Company may market their drywall as Sheetrock. However, other companies that make drywall are: National Gypsum Company, Titan Commercial Products, and Allied Manufacturing.

Types

Drywall comes in several different types. Standard panels can come in 1/4-inch to 3/4-inch thickness. Fire-resistant...

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I am no expert other than the re-muddling I have done around my own home, but I would say that the cement board route would be the better way to go. No matter how well "sealed" the plaster board is, it will eventually draw moisture due to the constant exposure over the years. Before the plaster board is installed, the shower pan should be installed. The plaster board is then installed to sit just off the lip on the inside of the shower pan but not above the edge of the pan. When they install the cement board (which, by the way, is used as exterior siding on homes in the south) make sure they tape and seal all the joints, a process similiar to installing wallboard, but done with a mesh tape and mortar, instead. A reputable drywaller or tiler should know to do this, but I would make sure ... this is no time for misunderstandings. Water damage inside a house can cause a multitude of problems, not the least of which is the shower coming through the downstairs ceiling one night...

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Oh Oh Doug. Now you have done it.

The story goes like this.

In the TCNA and TTMAC Specifications it mentions you need to follow the installation instructions of the product supplier. In Schluter's instructions it allows drywall. So, if you follow the TCNA and TTMAC recommendations about following product manufactures recommendations you get around this - so they say.

I went to my building department in North Vancouver and asked. I was told no.

I called Schluter and asked and they said Yes.

There is no inspection for this so really you will not get caught.

Other than Ardex I have found no other company recommending drywall. I asked my Mapei rep what thinset he recommends for installing Kerdi over drywall in a shower and he said none.

Ardex hooks you up if you want to go this route - but why would you?

There is more to the puzzle since if the drywall has been tapped with drywall compound then you need to prime. But they won't tell you...

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Floating Walls

Floating wall may also refer to walls floating on bodies of water.

For instance, “floating wall” refers to a type of wall, and "cement board" refers to a type of board. However, floating wall refers to the technique used to manufacture the wall, not the materials that make up the wall. Cement board, on the other hand, refers to the material used to construct these boards. Understanding the differences between floating bath walls and cement boards requires a look at each.

A floating wall in a home constitutes one of three things. Floating interior walls constitute walls built on small platforms. The design of the wall hides the platform so that the wall appears to float. Floating basement walls constitute walls connected at their bottom to a mechanism that provides a gap between the foundation slab and the basement wall. The space created by this mechanism allows the basement slab to rise during periods of soil expansion without impacting -- and...

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Hardie works pretty much as advertised. I'd recommend it too if I was selling it. It's 90% cement. Other concrete backers work fine too. Some are a little heavier, if that matters to you. Remember Hardie 1/2" is not 1/2" thick, (might make a difference), and I do not recommend it be submerged in water. You weren't clear since you said tub & shower. Is it two areas, or a tub that can be used to take a shower?

It's perfectly fine for a tub surround, OK for stall showers if you know the right way.

Quote:

You can apply a surface waterproofing on any backer. It's the best way to waterproof walls anyway. What method of waterproofing were you gona use?

Jaz

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Justanotherdumbdrywaller


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Re: Transitioning Drywall With Cement Board

Teetor, in your neck of the woods I will buy that. but there are still ways to keep using rock vs. wonderlessboard, when tile is not being applied. using a good sealer after fire taping and glazing, is just one way. Applying a moisture barrier between a surround and the rock is another, there are other alternatives. But like I said in your area with it's constant heat and humidity, I know rock doesn't fair to well. It's just in most normal climent cases, wonderless board is not always the answer. Especially once it starts to deteriorate, due to leaks, and we all know that over the coarse of a few years, there will be water behind the shower and in the wall.

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Home is the place where everything happens and I hope it is a good one. Most people tend to do almost anything when they want to obtain the best look of the house which also brings the practical aspects of the house as well. There are so many parts of the house we need to take care really carefully, including the wall for the house interior. For those who are having problems to choose which material you want to use, stay with me to find out more about sheetrock vs drywall issue. All of you know that those two materials of the wall are the most popular ones a lot of people choose as part of their house. Finding which one is the best should be easier as you know sheetrock vs drywall idea. So, what’s next now?

Choosing the right material for the wall could be really devastating job for those who do not know what choices they do have right now, but you do not need to worry at all since I am bringing you the two most popular materials for the wall, sheetrock and drywall....

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I hope someone here can give me feedback about this situation: Our wall-mounted toilet needed to be reset. The plumbers removed the greenboard and put on a new bracket. They recommended a water-resistant wall rather than greenboard. I considered these three products: Durock cement board, Hardiebacker tile backer and Denshield tile backer.

On two other forums I saw reports that some Denshield boards have terrible odors. Georgia-Pacific knows about the problems and will replace the boards, but I don't want the hassle of this potential problem.

I purchased a 3/5 Hardiebacker 500 board, but we discovered after having the board in the bathroom overnight that IT has a strong and strange odor, like a cross between toothpaste and a solvent. After moving the board to the garage, we found that the smell came from various areas on the board. I called Hardie, and they said they'd never heard of that problem before. They wondered if those areas of the board had gotten wet....

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Currently, per the building code, a portland cement plaster is only required to have a weather resistant barrier (WRB) behind it, which is satisfied by the ICF; hence, building paper would not necessarily be required. However, in an insulating concrete forms-stucco installation, the paper’s primary function is to serve as a bond breaker and not as a weather resistant barrier between stucco and insulation, which have significantly different rates of expansion and contraction due to changes in temperature and moisture condition. Therefore, best practice indicates isolating the two materials from each other to allow independent movement and reduce stresses that might otherwise lead to cracking in the plaster layer. By using a permeable paper, the permeability of the wall system remains unchanged.

If it is desired to apply a finish directly to the foam form, an exterior insulation and finish system (EIFS) material may be considered. These finishes are thin, lightweight,...

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I really do not understand why you have your panties in such a wad.

Cement board is NOT greenboard.
Are you confusing the two?
Unless you apply Keens cement or a setting joint compound to the cement board you have not really gained anything.

Ceramic tile is waterproof (not damaged by water) and depending on grade and type may be impervious to water penetration. The grout joints are not impervious to water penetration though, and whatever the tile is mounted on needs to be able to resist damage from the water that gets through the grout lines.

Greenboard is wax coated gypsum wallboard (more generically know as water resistant gypsum wallboard ). It is used in low quality work as a tile backer. Since tile is not waterproof and the wax coating is not adequate, tile walls with greenboard as a substrate have a history of failure after 5-8 years.

Cement board (Wonderboard, Durock, etc.) is fiberglass reinforced Portland cement made into boards. It is...

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