Can I place cement board over existing drywall in preparation for a natural stone?


Given that this if for inside application the first thing I would state is to follow the manufacture's instructions. Depending on the stone weight you will have different install methods.

However... given no info from manufacturer:

I would not cement board over drywall. You would have to use longer screw of course but the fact that the screw isn't binding for the first half inch will put some serious strain on this connection. If you are dead set on doing it, glue it then screw it.

I would have have personally installed on drywall in dry areas. As long as this isn't a shower I don't see a performance difference between the drywall or concrete board unless the stone was extremely heavy

To prep for drywall install I would double up on the drywall screws, install wire mesh over the area, and then give it a small scratch coat over the mesh.

If you can give me specs on the stone I can get more specific or change my answer but nothing wrong with...

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How to Use Recycled Stone for Green Building Projects

Have you ever wondered what happens to building materials after they are created, installed, and have served their useful life? Often, disposable products end up in landfills after they wear out. Today homeowners, designers, and architects are instead seeking materials that make a longer lasting impression on their projects and serve more than one useful life. There is a growing trend to reduce waste, conserve resources, and create more sustainable buildings and a sustainable way of life.

Left: These Big Dig cobblestones have a traditional patina that blends into many environments. Right: Semi-dimensional reclaimed granite blocks–raw material harvested. Photos courtesy of Stone Farm Living.

Natural stone can easily be reused, repurposed, and recycled into new applications and projects. From whole buildings to building elements such as flooring, walls, or countertops, and landscape components including...

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Step 1: Overview

The traditional method of installing ceramic tile called for setting it in a solid mortar bed. Troweling a perfectly flat bed required great skill, but the reward was a tile job that lasted for decades. Today, most professional tile setters back their tile with cement board instead, because it offers almost the same durability with a lot less work. And the best part? Do-it-yourselfers can use it too.

Cement board is a thin layer of mortar sandwiched between sheets of fiberglass mesh cloth. The 1/2-in. thick board is unaffected by water, making it a great substitute for a mortar bed.

In this article, we’ll show you how to create a strong, durable and waterproof tile base around your bathtub using cement board. We chose the tub surround because it’s highly leak-prone, and an ideal spot for cement backer board. Although cement board is heavy and a bit awkward to cut, even a novice should be able to complete a professional-quality tub surround,...

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Ceramic and decorative tiles can be fun to work with and are popular choices for walls, bathtub and shower surrounds, decorative surfaces, kitchen backsplashes, and accent walls. However, homeowners should not install ceramic tile directly over drywall if the surface regularly contacts water or moisture. Installing backer board first protects the drywall where water is an issue. Homeowners can install ceramic tile directly onto drywall in places such as kitchens and decorative walls where there is little exposure.

Adding Tile in Areas Exposed to Moisture

Drywall, also called sheetrock, contains an inner core of gypsum with an outer layer of a paper-like material. This final product is not water-resistant. Homeowners who tile directly over the drywall in areas around a bath often experience crumbling walls and tiles because the grout cannot withstand the consistent moisture levels. To tile over drywall in those areas, homeowners need to install backer board...

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Using Cement Boards Over Concrete Slab Construction

It seems that ceramic tile installation has an abundance of myths that pop up all too frequently regarding Do-It-Yourselfers on “help forums” and DIY websites. So-called tile experts offer advice and opinions based on, well… I’m not sure what some of the comments are based on or where some people get their (mis)information to tell you the truth. I want to address the subject of installing cement board products over a concrete substrate.

It is imagined by some that products like Durock, Hardibacker and others can be used to fix imperfections in the surface of concrete or to override a previously painted or sealed concrete surface. Installing tile over painted or sealed surfaces is usually not good practice.

In fact, the industry takes a dim view of such things and it has been known for many years that these types of coatings (paints, varnishes, sealers, etc.) are bond breakers of the worst kind when it comes...

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In regard to one of the posts here, you cannot simply install manufactured stone on drywall alone. The only strength that would have is the drywall's paper exterior - very unstable.

The correct way to install the material is to put a vapor barrier on the drywall and then nail your mesh into the studs for support. Extra staples are sometimes beneficial, as it allows the mesh to adhere closer to the wall, avoiding "bubbles" in the mesh. Bubbles can cause cracking not only in the mortar joint but can allow water to seep behind the stone in an exterior application, causing the stone to break its bond and fall off!

Staple sizes and procedures, mesh overlaps, and corner preparation as well as proper mortar mixing and installation are critical to a successful manufactured stone installation.

Although manufactured stone installation is somewhat easier than other masonry projects, there are still tips and tricks masonry professionals employ that adhere to the...

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Wow this is an old topic. That job was the first tiling work I had ever done. It came out great. Since then I have done (2) shower enclosures, (4) Floors, and a ton of other DIY remodeling projects.

Everyone has a different opinion on what should be done and how they do it. When it comes down to it "FOLLOW MANUFACTURER INSTRUCTIONS". If your contractor states otherwise I would be concerned.


If this is true and he didn't install a membrane UNDER THE CEMENT BOARD ditch him now. It is vital to have a water membrane in all shower enclosures. Water does permeate grout and cement board is only water resistant not waterproof. So if he installed one underneath the cement board and told you didn't need an additional roll on one, then he is correct, but it can't hurt to have the extra water protection. Its just extra money.

Anyways .... back on to the topic of the stone veneer. For ceiling heights of 8' to 9' you generally can install stone veneer on a...

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Now that you know which stone veneer product you want to use, you may be asking yourself: "How do I install stone veneer?" Don't worry! We've got you covered. Below are our step by step guide to help you learn how to traditional stone veneer istallation and also a tight-stack stone installation. The following is a broad outline for installing Cast Natural Stone.

Careful and proper installation is important for ensuring the long-lasting beauty of your Cast Natural Stone. For all exterior applications, required installation includes a scratch coat (also known as cement plaster coating) over a water-resistive barrier. The water-resistive barrier generally consists of two layers of properly applied Grade D paper, which is then covered with metal lath and a mortar scratch coating (cement plaster).

Installation over rigid sheathing:

The metal lath/scratch coating may be applied over structurally sound wall surfaces of plywood, OSB, concrete board or gypsum...

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