Emilie Meyer
Waterproofing a shower pan is an important step in ensuring that your shower is properly sealed and protected from moisture damage. While traditional methods of shower pan waterproofing exist, newer and more effective methods have been introduced in recent years. The type of waterproofing system you choose will depend on various factors, such as the materials used in your shower, personal preference, and the level of protection desired. In this discussion, we will explore different approaches to waterproofing a shower pan, including the use of sheet membranes, liquid membranes, and innovative waterproofing techniques.
Characteristics and Values
| Characteristics | Values |
|---|---|
| Waterproofing system | Kerdi fabric, RedGard, Hydroban, Laticrete, Schluter |
| Materials | Sheet membrane, liquid membrane, cement board, mud, mortar, concrete, PVC liner, polystyrene |
| Installation process | Measuring, cutting, mudding, applying membrane, sealing seams, installing drain |
| Challenges | Ensuring proper thickness of liquid membrane, waiting for drying time, waterproofing shower floor |
| Advantages | Ease of installation, flexibility, robustness, waterproofing effectiveness, lightweight |
| Disadvantages | Long drying time for liquid membranes, difficulty hanging Kerdi fabric on walls |
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What You'll Learn
Using Kerdi fabric for the shower base
Waterproofing your shower pan is an important step in preventing water damage, which can cause mould, mildew and structural rot. There are several ways to do this, including using a liquid membrane like Redgard or Hydroban, or a sheet membrane like Kerdi.
Kerdi is a popular choice for waterproofing shower bases because it is relatively easy to install and it eliminates the need for a mortar bed. Here is a step-by-step guide to using Kerdi fabric for the shower base:
First, you will need to measure the space for the Kerdi boards. Kerdi boards are made of polystyrene, so they are lightweight and manoeuvrable. They also come with markings and a pre-installed waterproofing membrane, so you only need to waterproof the seams.
Next, cut the Kerdi board to size using a utility knife. When cutting, tip the blade towards the straight edge to make a straighter cut. You can fully remove the cut piece by bending, scoring the opposite side, and pulling it free.
After measuring and cutting the Kerdi board, you will need to apply mortar to the subfloor, edge of the shower base, and walls. Use the flat side of a trowel to spread the mortar and then comb the excess with the notched side.
Press the Kerdi board firmly into place, ensuring that it is level. For the curb, you can use any unmodified thinset mortar similar to the one used for the Kerdi-Shower Tray. Seal the inside corners of the curb using Kerdi Kereck and the inside edge using the Kerdi Band.
Finally, follow the typical process for mudding, scraping, and applying the Kerdi band. You can also refer to the Schluter®- Systems Shower System Installation Handbook for complete installation guidelines and warranty criteria.
By following these steps, you can effectively waterproof your shower base using Kerdi fabric and prevent water damage in your home.
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Using RedGard for the shower walls
Yes, you can waterproof your shower pan and walls. Waterproofing your shower walls with RedGard involves the following steps:
First, you need to prepare the wall surface. Ensure that the wall is clean, dry, and free of any debris or loose material. If necessary, use a suitable construction adhesive to fill in any gaps or cracks on the wall.
Next, you will need to apply the RedGard Topical Membrane. This product is a liquid-applied membrane that creates a waterproof barrier on the shower walls. Using a gauge, apply the RedGard with a roller or a brush, ensuring that you achieve the required thickness. It is recommended to apply at least two coats of RedGard to the walls, allowing adequate drying time between coats.
When applying RedGard, pay particular attention to the corners and seams of the shower walls. These areas are more susceptible to cracking and leaking, so it is essential to reinforce them with anti-fracture fabric. Cut the fabric to size and embed it into the wet RedGard membrane, ensuring complete coverage.
After applying RedGard to the walls, you may need to apply a second coat to ensure thorough waterproofing. Follow the manufacturer's instructions for drying times and re-coating procedures.
Finally, once the RedGard membrane has cured, you can proceed with any subsequent steps in your shower installation process, such as tiling or installing fixtures.
RedGard is a popular choice for waterproofing shower walls due to its effectiveness and ease of application. However, it is important to follow the manufacturer's instructions and allow adequate drying time between coats to ensure a successful waterproofing project.
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Pros and cons of liquid membranes
Waterproofing is the most critical component of any finish construction assembly. Waterproofing your shower pan helps prevent water and steam damage, which can result in expensive repairs. One option for waterproofing your shower pan is to use a liquid-applied waterproofing membrane.
Liquid-applied waterproofing membranes have been around for years and meet stringent building codes. They can be applied using a spray, which can speed up drying time. The first coat, referred to as a tack coat, is followed by the first "build-coat". Thinner coats dry faster, and typically, 60-90 minutes after the first build-coat, you can apply the second and final build-coat.
Liquid membranes have both advantages and disadvantages. Some of the pros of using liquid membranes for waterproofing your shower pan include:
- They are easy to apply, especially for DIY installations where you have more time.
- They eliminate any concerns with seams between membrane sheets.
- They can be applied consistently over the surface, even on multidimensional shapes that are common in today's shower assemblies.
- They meet American National Standards Institute's (ANSI) specifications for load-bearing, bonded, waterproof membranes for thin-set ceramic tile and dimensional stone installation.
- Some liquid membranes are approved for use as a shower pan liner over occupied/living spaces.
- They can achieve a "low-perm" rating, making them suitable for continuous use in commercial steam shower applications.
On the other hand, some of the cons of using liquid membranes for waterproofing your shower pan include:
- They need to be applied at a certain thickness, so you need a gauge to ensure proper installation.
- They typically require at least two coats, which can take a long time to dry.
- You need to wait for each coat to dry before recoating, which can slow down the installation process.
- They are not approved for use in steam showers, unlike sheet membranes.
- They may not be suitable for use with a shower pan liner, as two impermeable layers can create a "mold sandwich".
- There is a risk of pin holes in the waterproofing, which could occur with liquid waterproofing.
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Pros and cons of sheet membranes
Waterproofing a shower pan is an essential step in ensuring that your wet room is fully functional and long-lasting. One popular method for achieving this is by using a sheet membrane system. Sheet membranes, such as Kerdi, Laticrete, or Tilesure, offer a range of advantages and disadvantages that are important to consider before starting your waterproofing project.
One of the most significant benefits of sheet membranes is their ease of installation. Sheet membranes are often preferred because they can be cut to the exact size needed, eliminating the possibility of gaps in the seal. They also have a protective backing on both sides, which keeps the installation area dust-free and allows you to continue working while the membrane bonds to the substrate. This is especially advantageous for large, commercial projects where productivity is crucial.
Sheet membranes also provide a robust tanking solution for areas at high risk of leaks. They are designed to be installed on the floors and floor/wall junctions of wet rooms, improving the floor's flexibility and helping to prevent cracks and tensions. Sheet membranes are fully waterproof and can be tiled immediately after installation, making them ideal for fast-track construction.
However, sheet membranes do have some drawbacks. One issue is that they may not be readily available locally, which can be a deciding factor when choosing a waterproofing method. Additionally, sheet membranes require careful installation to ensure proper sealing at the seams. While this can be mitigated by combining it with a liquid membrane at the seams, this adds an extra step to the process.
Another consideration is the overall cost of the project. While sheet membranes themselves may be more affordable, the installation process often requires additional materials and labour, which can increase the total expense.
In conclusion, sheet membranes offer a reliable and robust solution for waterproofing shower pans, particularly in areas susceptible to leaks. They are easy to install, provide immediate waterproofing, and can accommodate fluctuations in temperature and movement. However, their availability, the need for careful seam sealing, and the potential for higher overall costs are important factors that should be carefully weighed when deciding on the best waterproofing approach for your shower pan.
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The Schluter system
Tiles and grout joints are not inherently waterproof and must be installed with a waterproofing system. The Schluter®-Shower System is an integrated family of products that form a fully bonded, watertight assembly for tiled showers. The system eliminates the risk of failures due to water and vapour penetration and reduces installation time.
The Schluter-KERDI-DRAIN can accommodate various tile thicknesses and features an integrated bonding flange. The KERDI waterproofing membrane adheres to the flange, forming a waterproof connection at the top of the tile assembly. The KERDI-LINE is a low-profile linear drain perfect for curbless showers.
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Frequently asked questions
You can use sheet membrane products like Kerdi, Laticrete, or Hydroban, or liquid membranes like Redgard or Hydroban.
Sheet membranes are easy to install. You can tile immediately after installing them, and they are approved for steam showers.
Liquid membranes need to be applied at a certain thickness, so you need a gauge. They also need at least two coats and take a long time to dry.
The best waterproofing system for your shower pan will depend on your specific needs and preferences. Some popular options include the Schluter system and using Kerdi fabric for the shower base and RedGard for the shower walls.
One common mistake is installing the shower pan liner on top of the shower wall substrate instead of behind it, which can cause water to wick up behind the liner and into the wall framing. Another mistake is using fasteners for the waterproofing barrier inside the shower curb framing rather than outside.
