Ella Walter
Applying RedGard over a Kerdi shower pan is a topic of debate among DIY enthusiasts and professionals. Some people suggest using alternative products like Ardex 8+9 or a membrane over sheetrock. Others suggest using the Kerdi membrane and drain on the floor, curb, and up the wall, followed by applying two coats of RedGard to the walls, overlapping the Kerdi at the base. However, there are concerns about the potential for trapped moisture and mould issues when using RedGard over Kerdi, especially if proper drainage and weep holes are not considered. It is essential to follow manufacturer instructions and ensure proper drainage to avoid potential problems.
Can I apply Redguard to a Kerdi shower pan?
| Characteristics | Values |
|---|---|
| Applying Redguard over Kerdi band | Not recommended due to the risk of trapped water and mould |
| Redguard as waterproofing | Yes, but not recommended as a substitute for a pan liner |
| Redguard application | Time-consuming; faster alternatives available |
| Redguard vs Kerdi | Kerdi is more expensive but faster and more reliable |
| Redguard and Kerdi together | Can be used together but requires careful installation |
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What You'll Learn
RedGard vs Kerdi Band
RedGard and Kerdi Band are both waterproofing solutions for showers. RedGard is a liquid membrane that can be applied to shower pans and cement board walls to create a waterproof barrier. Kerdi Band, on the other hand, is a tape-like product that is used to seal the seams and joints in shower installations. It is made of polyester and is waterproof.
Some people suggest using RedGard over Kerdi Band for extra protection. They argue that while Kerdi is waterproof, adding a layer of RedGard can provide additional waterproofing and help to ensure that the shower installation lasts a long time. In this method, the Kerdi Band is applied to the seams and joints first, and then the RedGard is applied over it.
However, others caution against using RedGard over Kerdi Band. They argue that the two products may not adhere well to each other, leading to potential problems with mould. Additionally, using multiple products can increase the complexity and time required for the project.
Another consideration is cost. While RedGard and Kerdi Band are both effective waterproofing solutions, using multiple products can increase the overall cost of the project. In some cases, it may be more cost-effective to use a single product, such as Kerdi membrane over drywall, rather than combining RedGard with another system.
Ultimately, the decision to use RedGard, Kerdi Band, or a combination of both depends on various factors, including the specific project requirements, personal preferences, and cost considerations. Both products have their advantages and disadvantages, and it is important to carefully consider the instructions and recommendations provided by the manufacturers to ensure a successful installation.
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RedGard as a waterproofing layer
RedGard is a waterproofing product that can be applied to a shower pan and cement board walls. It is a liquid membrane that can be used as an extra safety precaution to waterproof surfaces. When using RedGard, it is important to ensure that all surfaces are completely covered for effective waterproofing.
While RedGard can be used as a waterproofing layer, some people prefer to use alternative products or methods for shower waterproofing. One commonly mentioned alternative is the Kerdi system, which includes products such as Kerdi-board, Kerdi band, and Kerdi drain. The Kerdi system provides surface waterproofing and eliminates the need for a separate membrane. It is known for its ease of use and reliable performance.
Another alternative mentioned is Durock or DuRock, which can be used in combination with RedGard or Kerdi. Durock is a type of cement board that serves as a sturdy base for shower walls and floors. It is important to consider the compatibility and potential benefits of using certain products together, such as RedGard with Durock or Kerdi.
Additionally, some people opt for a traditional shower pan with a membrane liner or a Schluter foam base instead of using liquid membrane products like RedGard. It is recommended to have weep holes in the base of the drain to allow for proper drainage and prevent moisture buildup.
When it comes to using RedGard specifically as a waterproofing layer, it is essential to follow the manufacturer's instructions and take into account the specific characteristics of the product. RedGard has a relatively slow drying time, which can be a consideration for some projects. Overall, RedGard can be an effective waterproofing solution when used appropriately and in conjunction with other compatible materials.
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RedGard application process
The application process for RedGard begins with thorough surface preparation. This involves removing any loose debris, dust, or contaminants that may hinder adhesion. Once the surface is clean and dry, RedGard can be applied using a roller, brush, trowel, or airless sprayer, ensuring even coverage and full saturation. It is critical to achieve the manufacturer-recommended thickness, which is typically verified through the membrane's distinct red hue. In areas with increased moisture exposure, such as corners and joints, reinforcing fabric or mesh may be used in conjunction with RedGard to further enhance waterproofing performance.
RedGard is an innovative waterproofing and crack-prevention membrane that offers a reliable and effective solution for tile installations in moisture-prone areas. Its unique elastomeric polymer and cementitious components form a flexible, durable, and water-resistant barrier that can accommodate normal building movement and resist tile debonding. It is designed for use on both interior and exterior tile projects and can be applied to cement board walls and shower pans.
It is important to note that some sources advise against using RedGard over a Kerdi band, as it may trap water between the two layers and cause mould. Instead, it is recommended to use a system with surface waterproofing, such as Kerdi or Laticrete Drain, to eliminate extra work and potential problems.
However, other sources mention using RedGard as an extra safety precaution over the Kerdi band in corners and changes of plane. It is essential to follow manufacturer instructions and properly prepare the surface to ensure successful RedGard application.
RedGard has a quick-dry formula, allowing for efficient application and faster project completion. It dries within hours and requires a minimum of 48 hours to cure completely. This waiting time is critical for the membrane to provide an effective waterproof barrier.
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Kerdi Drain system
While it is not recommended to use Redgard liquid membrane to seal a traditional drain, the Kerdi Drain system is a reliable alternative. The Schluter®-KERDI-DRAIN is a shower drain with an integrated bonding flange that connects to the KERDI waterproofing membrane. This drain system is specifically designed to integrate with the Schluter®-Shower System, a family of products that form a fully bonded, watertight assembly for tiled showers.
The KERDI-DRAIN has a large contact area, providing a secure connection to the waterproofing membrane. The drain grate is available in various finishes and colours, including stainless steel, anodized aluminium, and a tileable option. It also comes in five designs: FLORAL, CURVE, PURE, CLASSIC, and CONTOUR. The integrated sloped bonding flange is available in ABS, PVC, or stainless steel, allowing for a secure, topical waterproofing connection. The KERDI-DRAIN can accommodate a wide range of tile thicknesses, from 1/4" (6mm) to 1-1/4" (32 mm).
The KERDI-LINE-VARIO is another option within the Kerdi Drain system, offering a customizable linear drain solution for tiled showers. Its adjustable frame and grate design enable on-site cutting and customization, making it versatile for different projects. The KERDI-LINE-VARIO is compatible with the KERDI-SHOWER-LT/-LTS shower trays and seamlessly integrates into the Schluter®-Shower System.
For floors that are at risk of water exposure, the KERDI-DRAIN-F is a specialised floor drain that is compatible with Schluter uncoupling membranes such as DITRA, DITRA-XL, DITRA-HEAT, and DITRA-HEAT-DUO. Before installing the Kerdi Drain system, it is important to consult the Schluter®-Shower System Installation Handbook for detailed instructions and to perform a water test for quality control.
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RedGard over Schluter Kerdi
Applying RedGard over Schluter Kerdi is a technique some people use to ensure their shower is waterproof. Some people suggest putting fibreglass cloth in corners "glued" down with RedGard. However, some people are unsure whether this works the same as using Kerdi band.
RedGard is a liquid membrane that can be applied to a shower pan and cement board walls. It can be brushed, rolled, or trowelled on, but it is important to ensure that it is applied without leaving pinholes.
Kerdi is a waterproofing system that has been around for 18 years. It is a system that works when the installer follows directions. However, some people have reported that their Kerdi systems have failed, even when installed by professionals.
Applying RedGard over Kerdi will void the warranty, and some people are concerned about the potential for water to get trapped between the two layers, causing mould.
One person reported using Kerdi band over RedGard on the seams, but they were not confident in the installation and planned to redo it with thinset.
Another person reported using RedGard over Kerdi with no issues, but they did not provide details on how they applied it or if they followed the manufacturer's instructions.
Therefore, while it is possible to apply RedGard over Schluter Kerdi, it is important to carefully consider the potential risks and follow the manufacturer's instructions for the entire installation.
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Frequently asked questions
No, it is not recommended to apply Redguard over a Kerdi shower pan. Redguard can trap water between the two layers, leading to mould.
Ardex8+9 is a good alternative to Redguard. You can also use a membrane over sheetrock if you don't want to use Kerdi.
Yes, you can use Redguard with a Kerdi band. Apply the Kerdi band to the joints of the boards, the corners of the walls, and the wall and pan transition. Then, apply Redguard to the walls, overlapping the Kerdi at the base of the wall.
