Tillie Doyle
Durock is a popular material used in bathroom remodelling and tiling projects. While it is commonly used on shower walls and floors, some people question its effectiveness as a shower pan liner. A shower pan liner is essential for waterproofing, protecting the porous shower wall framing and lower floor layers from water permeation and mould outbreaks. Durock or cement board is not sufficient on its own and must be combined with a waterproofing method such as a rubber liner, paint-on water proofer, or a surface waterproof membrane. It is important to consider the potential for wicking, where water is absorbed and carried up the back of the durock or cement board. Proper installation methods, such as floating the walls and pans, can ensure flat surfaces and effective drainage. Building codes and regulations also play a role in determining the appropriate materials and techniques for shower pan liners.
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What You'll Learn
Durock for a shower pan is not recommended
Durock is a type of cement board that is often used as a tile backer in showers. While Durock can be used in shower installations, it is not recommended to use it as the sole component of a shower pan. Here are several reasons why Durock may not be the best choice for a shower pan:
Wicking and Leaking Issues: Durock is a porous material that can absorb water. If used in a shower pan, the Durock may absorb water and cause wicking issues, leading to leaks. Water can be carried up the back of the Durock and onto the framing, resulting in potential water damage to the structure. This capillary action or wicking has been observed by some installers, who have reported leaks over the edge of the pan.
Difficulty in Achieving a Flat Sloped Surface: Durock comes in rigid panels, which can be challenging to work with when trying to achieve a flat sloped surface necessary for proper drainage in a shower pan. This can result in an uneven surface that is uncomfortable to stand on and may not drain effectively.
Increased Cost and Time: While Durock may seem like a cost-effective option, when used in a shower pan, it often requires additional steps and materials to ensure proper installation. For example, some installers recommend setting the Durock slightly above the drain height or leaving a small gap between the Durock and the pan to address wicking concerns. These extra steps can add time and cost to the project.
Building Code and Inspection Issues: In areas with building codes and enforcement, using Durock in a shower pan may cause issues during inspections. Building inspectors have noted that tile setters using Durock may violate basic construction principles by sealing water into the walls. This can lead to potential issues with the final inspection and may cause headaches for homeowners.
Alternative Options: There are alternative options available that are specifically designed for shower pans, such as mortar floats or pre-sloped shower pan systems. Mortar floats can be used to create perfectly flat walls and pans, ensuring a comfortable standing surface with proper drainage. Pre-sloped shower pan systems, like the Schluter Kerdi system, offer an easier installation process without the need for complicated mortar and sloping associated with Durock installations.
In conclusion, while Durock can be used in shower installations, it is not recommended as the sole component of a shower pan due to potential wicking and leaking issues, difficulty in achieving a flat sloped surface, increased cost and time, building code concerns, and the availability of alternative options specifically designed for shower pans.
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Durock and wicking issues
Durock is a popular product used in showers and bathrooms. However, it is important to be aware of wicking issues when using this product. Wicking is the process by which Durock or cementious board absorbs water, which is then carried up the back and onto the framing. This can result in water leaks over the edge of the pan, as observed by a user.
To address wicking issues, it is recommended to set the Durock board slightly above the shower pan. Specifically, setting the board about 1/8-1/4 inch off the pan can help eliminate wicking problems. This small gap allows for any water that may be absorbed by the Durock to drain back into the pan, preventing it from travelling upwards and causing leaks.
Some people choose to address wicking issues by using a surface waterproof membrane. This method involves setting the walls directly on the floor and then pouring the pan. However, it is important to choose a suitable product for this purpose.
Additionally, it is worth noting that while some contractors may choose not to waterproof Durock or cement boards, others recommend using a paint-on water proofer for effective waterproofing. This extra step can provide added protection against wicking and potential water damage.
Finally, when using Durock, it is important to avoid creating a "mold sandwich." This occurs when a membrane, such as Durock, is used in combination with a vapor barrier like plastic or felt paper. If moisture wicks through the Durock and encounters the vapor barrier, it becomes trapped with no escape route, leading to potential mold issues. Therefore, it is recommended to avoid using a vapor barrier in conjunction with Durock to prevent creating an environment conducive to mold growth.
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Waterproofing Durock
Durock is a type of cement board that can be used for shower pans and walls. While some people choose not to waterproof cement boards, it is generally recommended to waterproof Durock, especially in areas that will be exposed to water, such as showers. Waterproofing Durock can help prevent water damage and mould growth.
There are several ways to waterproof Durock. One method is to use a surface waterproof membrane. This involves setting the Durock walls to the floor and then pouring the pan. Another approach is to use a liquid waterproofing membrane, such as the Durock Brand Liquid Waterproofing and Crack Isolation Membrane. This product is an acrylic polymer-based membrane that can be applied to concrete, cement board, and masonry surfaces. It provides exceptional waterproofing and anti-fracture protection.
It is important to note that if you are using a membrane, you should not put screws, staples, or any other holes in the Durock, as this could compromise the waterproofing. Instead, you can use a product like Schluter Kerdi, which is a membrane and pan liner that is easier to install than traditional rubber liners.
Additionally, it is recommended to use a moisture barrier behind the Durock to further protect against water damage. This can be done by using a liquid membrane or a product like tar paper or plastic vapour barrier.
By following these steps and using the appropriate products, you can effectively waterproof Durock and ensure the durability of your shower installation.
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Durock installation without screwing through the liner
Durock cement boards are commonly used in bathroom remodelling, especially in showers. However, it is not advisable to screw through a PVC pan liner. If you are installing Durock boards on a concrete slab, you can use thin-set mortar to adhere the Durock to the concrete slab. Here is a step-by-step guide on how to install Durock without screwing through the liner:
- Cut the Durock cement boards to size before installation. Use a utility knife and a straightedge to score the panel face and cut through the glass-fiber reinforcing mesh. Then, snap and cut the backside mesh to break cleanly.
- Prepare your concrete slab by filling any cracks and ensuring it is level and free of structural issues.
- Apply a liquid membrane to the concrete slab using a trowel, ensuring full coverage. This will act as a moisture barrier.
- Place the cut-to-size Durock boards onto the prepared concrete slab. Ensure the boards are secure and level.
- If necessary, apply a second layer of thin-set mortar or adhesive on top of the Durock boards to install your chosen flooring or tiling.
It is important to note that using only thin-set mortar to attach Durock to a concrete slab may not provide a strong bond, and drilling and screwing will be required for a solid installation. However, this method can be challenging and time-consuming, and it may raise the floor height. Always refer to the manufacturer's guidelines before starting the installation process.
Additionally, consider using a membrane system or a mortar float for your shower installation. These methods can provide a better result and ensure proper drainage, comfort, and ease of standing.
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Durock and shower pan liners: installation and products
Durock is a type of cement board that is often used in shower installations. While it is possible to use Durock without a shower pan liner, it is not recommended as it can lead to water absorption and potential leaks.
Installation:
When installing Durock in a shower, it is important to consider the type of shower pan and drainage system being used. If using a traditional pan, it is recommended to set the Durock about 1/8-1/4" off the pan to prevent wicking issues. Wicking refers to the absorption and upward movement of water through the Durock and into the wall framing, which can lead to water damage and mould.
If using a shower pan liner, it is important to ensure that the Durock does not come into direct contact with water. This can be achieved by properly waterproofing the installation. One method is to use a surface waterproof membrane, such as the Schluter Kerdi membrane, which can be applied before installing the Durock. Another method is to use a liquid membrane, such as Red Guard, which can be painted over the installed Durock.
Products:
There are several products available for waterproofing Durock installations:
- Schluter Kerdi membrane and pan liner: This product is recommended for DIY installations as it does not require the use of mortar, sloping, or a rubber liner.
- Oatey shower pan liner kits: These kits include a liner and corner dams, and are suitable for centre point drain installations. Oatey also offers Perfect Slope, which can be installed on the subfloor to create a pre-sloped surface for the liner.
- PVC rubber/vinyl liner: This type of liner can be custom-cut to fit unique shower sizes and is available at specialty shops and hardware stores.
- Red Guard: A liquid waterproofing product that can be painted over the installed Durock to create a waterproof seal.
It is important to follow the manufacturer's instructions and local building codes when installing Durock and shower pan liners to ensure a proper and safe installation.
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Frequently asked questions
No, you should not put Durock without a shower pan liner. Durock or cement board will absorb water, so it is not advisable to use it for a shower pan.
A shower pan liner is a waterproof barrier that is installed under the shower pan to protect the porous shower wall framing and lower floor layers from water permeation and mould.
Oatey's shower pan liner kits are popular and come with one liner and two corner dams. The liner is made of CPE or PVC sheet material. Another popular option is the Schluter Kerdi membrane and pan liner.
First, ensure that the pre-sloped mortar bed is dry and free of debris. Then, cut the liner according to the application height and fold the sides. Remove the test plug from the drain and drape the liner over the mortar bed and drain base, making sure the wall-facing edges are folded correctly. Cut an X-shape over the bolts and a hole over the drain hole. Apply silicone caulk around the surface of the inner flange, then fold the liner back over and screw the clamping ring down.
An alternative to using a shower pan liner is to use a mortar float, which will result in a flat sloped surface that is comfortable to stand on and drains well.
