If you're planning a bathroom renovation or starting from scratch, the shower base probably isn’t the first thing on your mind — but it should be. A good shower tray does more than just support tiles — it’s your first line of defense against water damage and leaks. When it’s done right, you won’t even notice it. But when it’s done wrong, you definitely will.
That’s why many homeowners, renovators, contractors, and builders are choosing the Schluter shower tray. It takes the guesswork from one of the most important — and often most challenging — parts of building a reliable, long-lasting shower. With integrated waterproofing built right in and a design that makes installation way less stressful and faster, it’s a smart, practical solution for anyone who wants to get it done right the first time.
In this guide, we’re going to walk you through the different types of Schluter trays, how to choose the right one for your space, and what to keep in mind during installation. Whether you're going for a sleek, curbless look shower or just want something that works and won’t fail on you, we’ve got you covered.
Why More People Are Choosing Schluter Shower Trays
Built-In Waterproofing That Actually Works
Every Schluter Kerdi tray comes with a layer of KERDI waterproofing membrane factory-attached. You don’t need to spend extra time applying a separate membrane or worry whether you did it right. This sheet-applied waterproofing membrane is made of polyethylene with fleece on both sides, creating a bonded waterproof layer that forms a solid barrier to keep moisture exactly where it belongs—in the drain.
It also cuts down on mess and materials. No full-on waterproofing sessions. Just lay the tray using thin-set mortar adhesive, connect the drain, and move on to the tiling. It’s clean, quick, and reliable.
A Smarter, Simpler Install
One of the biggest pain points with traditional shower bases constructed with a mortar bed is the slope — too much or too little, and you’re asking for puddles, leaks, or worse. Schluter Kerdi trays are precision-cut with the right slope already built in, so you don’t have to fuss with mortar beds or calculate angles on your own.
They’re also incredibly lightweight. You don’t need a team to haul them into the bathroom or a pro-level skill set to trim them down. Most trays can be cut with a simple utility knife and installed in the afternoon. If you’re managing your own reno or just want to make life easier for your contractor, it’s a huge win.
A Quick Look at the Schluter Shower Tray Lineup
KERDI-SHOWER-T, -TS, and -TT: Point Drain Trays
KERDI-SHOWER-T Series with the Center Drain Placements:
KST9651525 (38" x 60"), Metric Size (97 cm x 152 cm), catalogued as KST 965/1525
KST12201525 (48" x 60"), Metric Size (122 cm x 152 cm), catalogued as KST 1220/1525
KST12201830 (48" x 72"), Metric Size (122 cm x 183 cm), catalogued as KST 1220/1830
KST1525 (60" x 60"), Metric Size (152 cm x 152 cm), catalogued as KST 1525
KST1830 (72" x 72"), Metric Size (183 cm x 183 cm), catalogued as KST 1830
KERDI-SHOWER-TS Series with the Off-Center Drain Placements:
KST9651525S (38" x 60"), Metric Size (97 cm x 152 cm), catalogued as KST 965/1525 S
KERDI-SHOWER-TT Series with the Thin Perimeter Height to facilitate curbless shower constructions:
KST965810BF (32" x 38"), Metric Size (81 cm x 97 cm), catalogued as KST 965/810 BF
KST915BF (36" x 36"), Metric Size (91 cm x 91 cm), catalogued as KST 915 BF
KST965BF (38" x 38"), Metric Size (97 cm x 97 cm), catalogued as KST 965 BF
KST9151220BF (36" x 48"), Metric Size (91 cm x 122 cm), catalogued as KST 915/1220 BF
KST1220BF (48" x 48"), Metric Size (122 cm x 122 cm), catalogued as KST 1220 BF
KST965NA/BF (38" x 38") Neo-Angle, Metric Size (97 cm x 97 cm), catalogued as KST 965NA/ BF
These are the classics. If your shower drain sits in the middle or slightly offset from the centre, this line is designed for you. The “T” models are standard height, the “TS” versions are slightly sloped for thinner builds, and the “TT” ones are specifically made for curbless showers thanks to their ultra-slim profile around the perimeter.
The best part is that they all come pre-sloped and ready to go, so all you need to do is cut them to size if needed, set them in place, and start waterproofing.
KERDI-SHOWER-LT and -LTS: For The Linear Drain Installation
Schluter KERDI SHOWER-LT series with the center linear drain placement:
KSLT1000 39" x 39" (100 cm x 100 cm) features a height of 1-1/4" (32 mm) at the tray edge, catalogued as KSLT 1000
KSLT1220 48" x 48" (122 cm x 122 cm) features a height of 1-3/8" (34 mm) at the tray edge, catalogued as KSLT 1220
KSLT1395 55" x 55" (140 cm x 140 cm) features a height of 1-7/16" (36 mm) at the tray edge, catalogued as KSLT 1395
Schluter KERDI SHOWER-LTS series with the perimeter offset linear drain placement:
KSLT1000S 39" x 39" (100 cm x 100 cm) features a height of 1-21/32" (42 mm) at the tray edge, catalogued as KSLT 1000 S
KSLT1220S 48" x 48" (122 cm x 122 cm) features a height of 1-13/16" (46 mm) at the tray edge, catalogued as KSLT 1220 S
KSLT1395S 55" x 55" (140 cm x 140 cm) features a height of 2" (50 mm) at the tray edge, catalogued as KSLT 1395 S
KSLT9151395S 36" x 55" (91 cm x 140 cm) features a height of 2" (50 mm) at the tray edge, catalogued as KSLT 915/1395 S
KSLT9151830S 36" x 72" (91 cm x 183 cm) features a height of 2-5/16" (58 mm) at the tray edge, catalogued as KSLT 915/1830 S
KSLT9651930S 38" x 76" (97 cm x 193 cm) features a height of 2-3/8" (60 mm) at the tray edge, catalogued as KSLT 965/1930 S
KSLT1930965S 76" x 38" (193 cm x 97 cm) features a height of 1-5/8" (41 mm) at the tray edge, catalogued as KSLT 1930/965 S
Want that clean, spa-like look with a long, sleek drain? These trays are made for that. Instead of a traditional centre drain, they slope in a single direction toward a linear drain, usually placed at one end of the shower. It’s not just about aesthetics — this setup is also super practical for barrier-free designs and large-format tiles.
The LT trays are slightly thicker, while the LTS trays are lower profile, giving you more flexibility depending on your floor height.
KERDI-SHOWER-R: For When You Need a Ramp
If accessibility is important — whether for aging-in-place design or accommodating mobility aids — the KERDI-SHOWER-R ramp lets you build a zero-barrier entry. It works seamlessly with select tray models and maintains the same waterproof standards across the board.
How to Choose the Right Tray for Your Shower
Measure Twice, Trim Once
Start with your layout. Get precise measurements of the shower area, and take note of where the drain will be. If you're working on a renovation, you may have to work around existing plumbing. Schluter trays are easy to cut, but you still want to minimize trimming where you can — it’s faster and cleaner that way.
Drain Style Makes a Difference
Think about the look and function of your drain. Point drains are great for traditional setups, and they’re usually easier to install if you’re replacing an old shower. But linear drains give you more freedom with tile layouts and are often easier to slope for curbless entries. They also look incredibly modern.
Planning for a Curbless Shower?
If you’re dreaming of a flush, walk-in shower with no step, you’ll need to pay close attention to floor height. The KERDI-SHOWER-TT tray is designed specifically for this. It has a thinner edge profile, which helps you get a seamless transition from bathroom floor to shower floor — no bump, no trip hazard.
Just make sure your subfloor is ready to handle the slope. Sometimes that means cutting into the joists or building up the floor around it. A bit more prep up front saves you a ton of headaches down the line.
Subfloor Condition Matters
Your Schluter® shower tray is only as good as the floor it sits on and must be installed on a properly prepared surface. Always verify that the subfloor is flat, level, and structurally sound before beginning. Any dips, humps, or movement in the floor can compromise the bond with the thin-set mortar and affect both stability and drainage.
Use a long straightedge to check for uneven areas and address them with appropriate leveling or patching compounds. This step is essential for polystyrene foam shower trays, which are designed to work with thin-set mortar across the full surface. Inaccuracies in the subfloor can lead to flexing, improper support, or cracked tiles after installation. Whether you're working over plywood, OSB, or concrete, taking time to prep the substrate properly will help ensure a successful, long-lasting installation.
What to Know Before You Install
Subfloor Prep: Get It Flat and Clean
This is where everything starts. Your subfloor needs to be flat, solid, and totally clean. No dust, no debris, and definitely no movement. If the surface is uneven or has dips, use a floor leveling compound to smooth it out first. Don’t skip this part — if your base isn’t sound, the tray won’t sit right, and you’ll end up with issues later.
Mortar Matters: Use the Right Stuff for Your KERDI Tray
When installing a Schluter®-KERDI prefabricated shower tray, selecting the appropriate thin-set mortar is essential for achieving a durable, waterproof, reliable, and long-lasting installation of your shower floor.
When setting the tray onto a plywood subfloor, Schluter recommends using a modified thin-set mortar such as Schluter®-ALL-SET® or Schluter®-FAST-SET®. These modified mortars provide superior adhesion to wood substrates, ensuring a stable bond between the tray and the floor. For installation over a concrete subfloor, Schluter gives you more flexibility: you can use Schluter®-SET®, which is an unmodified mortar or stick with the modified options. Spread the mortar evenly with a notched trowel and set the tray firmly in place. Press it down evenly to ensure full contact underneath.
Before installing the tray, ensure that the KERDI-DRAIN flange is properly connected to your waste line using the appropriate ABS or PVC coupling adapter, matching the material of your existing plumbing. Mixing ABS and PVC components is not permitted, as it violates plumbing codes. Once the drain flange is securely in place and the mortar has cured, the KERDI tray, with its integrated KERDI membrane on top, is ready for tiling.
At this stage, Schluter recommends using Schluter®-SET®, ALL-SET®, or FAST-SET® mortars, as these are specifically formulated to provide optimal adhesion and bond effectively with the KERDI membrane, ensuring a fully waterproof seal for your tile installation project. Apply the mortar evenly using a 1/4" x 3/16" (6 mm x 5 mm) V-notched trowel or a Schluter®-KERDI-TROWEL, and press the tiles firmly to eliminate air pockets, ensure full contact, and remove voids, resulting in a solid, secure installation. Following these guidelines will help ensure a durable, leak-free, and long-lasting shower system.
Seamless Waterproofing with KERDI System
Even though the surface of the KERDI shower tray is already waterproof, it's crucial to properly seal the walls and any seams around it to ensure a fully watertight shower enclosure. This is where the KERDI waterproofing system shines. Use KERDI-BAND or pre-cut pieces of KERDI membrane to seal all join lines, corners, and floor/wall transitions by overlapping. For inside and outside corners, Schluter offers preformed KERDI-KERECK-F pieces, which simplify the process and ensure a reliable seal. All KERDI components should be bonded using Schluter thin-set mortar, ensuring a continuous waterproof barrier.
Don't overlook the need to seal around the drain and any wall penetrations. Schluter provides prefabricated seals like KERDI-SEAL-PS for pipes and KERDI-SEAL-MV for mixing valves, which are designed to integrate seamlessly with the KERDI membrane. Alternatively, KERDI-FIX, a versatile sealing adhesive, can be used to secure these areas effectively. These small touches may seem minor, but they make a huge difference in the long run. Paying attention to these details ensures a durable, leak-free shower system that stands the test of time.
Ready for Tile in No Time
Once the Schluter®-KERDI shower tray is fully set and dry, you’re ready to move on to tiling. Thanks to its integrated slope, there’s no need to worry about building the pitch yourself or dealing with uneven cuts and awkward dips that can happen with traditional mortar beds. The tray’s prefabricated slope is precisely engineered to ensure proper drainage, allowing you to start near the drain and work your way out while keeping your layout clean and consistent.
Use Schluter®-SET®, ALL-SET®, FAST-SET®, or an unmodified thin-set mortar that meets ANSI A118.1 standards to set the tile; these are all approved for bonding over the KERDI membrane. Just make sure your tile is rated for wet areas, which is critical for long-term performance in a shower environment. Whether you're working with ceramic tile, porcelain tile, granite tile, marble tile, travertine tile, slate tile, limestone tile, sandstone tile, onyx tile, quartzite tile, or large-format slabs, the KERDI tray gives you a strong, reliable surface to build on, making installation smoother and helping your finished shower stand the test of time.
Making It Last: Maintenance and Longevity
Waterproof for the Long Haul
When installed properly, the Schluter®-KERDI waterproofing system is designed to provide long-lasting protection against water intrusion and can last for decades without issues. However, like any tiled assembly, it's smart to inspect things now to confirm everything has been installed properly and is functioning as intended. Even in the early stages, small signs, such as cracked grout, loose tiles, or sealant beginning to pull away in corners, can indicate installation issues or areas that need attention before use.
These are early warning signs that shouldn't be overlooked. If you notice any of these issues, it's important to address them promptly to prevent water from penetrating the system. For instance, reapplying grout or replacing damaged tiles can extend the longevity of your shower. Additionally, ensuring that sealants around penetrations and corners remain intact is crucial. Regular maintenance not only preserves the functionality of your shower but also extends its lifespan, ensuring it remains waterproof for years to come.
Clean Gently, Clean Often
To maintain the appearance and longevity of your Schluter®-KERDI shower system, it's important to clean it regularly using appropriate methods. Use a mild, pH-neutral cleaner when scrubbing your shower floor. Avoid harsh chemicals or anything abrasive, as they can wear down the tile finish and potentially damage the grout or sealant over time.
Additionally, keep the drain area clear of hair and buildup. A quick check after each shower can go a long way in preventing clogs and slow drainage.
By following these maintenance tips, you can help ensure your shower remains clean, functional, and in good condition for years to come.
Backed by Warranty and Support
When installed as part of the complete Schluter®-Shower System—including the KERDI tray, KERDI waterproofing membrane, and Schluter®-branded thin-set mortars, your installation is eligible for Schluter's Lifetime Thin-Set System Limited Warranty. This comprehensive warranty offers long-term protection against manufacturing defects and ensures the system performs as described in Schluter's installation handbooks and technical data sheets.
To maintain warranty eligibility, it's essential to follow Schluter's installation guidelines meticulously and retain all purchase receipts and documentation. While registration isn't mandatory for all products, registering your system can expedite any future warranty claims.
In the unlikely event of a performance issue, Schluter commits to repairing or replacing the affected portion or reimbursing the original installation cost, provided all warranty conditions are met. This level of support offers peace of mind, knowing that your investment is protected for the long haul.
GTD Supply Can Help You with Shower Planning and Tray Selection
At GTD Supply, we go beyond merely stocking products on shelves. We understand the stakes involved in shower or bathroom renovations — time, budget, and peace of mind. That's why we're committed to helping you make smart, confident choices from the start.
Need help figuring out which Schluter® shower tray is compatible with your floor layout or plumbing configuration? Our experienced team is here to guide you through the available options, ensuring both compatibility and optimal performance. We can also help you evaluate how the tray will work with your tile plan, ensuring a seamless and professional finish.
We maintain a strong inventory of Schluter® products ready to ship, so you're not left waiting when your project is ready to go. Additionally, we can assist with understanding Schluter's warranty requirements. For example, installing the KERDI tray as part of the complete Schluter®-Shower System—including components like the KERDI waterproofing membrane and Schluter thin-set mortars—makes your installation eligible for Schluter's Limited Warranty.
By partnering with GTD Supply, you're not just purchasing products; you're working with a team dedicated to helping you make confident choices and ensuring the success of your Schluter® shower installation.
Conclusion: Build It Right with Confidence
Choosing the right Schluter® shower tray isn't just about picking the one that fits your space — it's about constructing a shower that lasts. Whether you're aiming for a sleek, modern design with a linear drain or preferring the classic approach with a point drain, selecting the right tray makes all the difference.
Schluter® offers a range of prefabricated shower trays, such as the KERDI-SHOWER-T, -TS, and -TT, featuring integrated waterproofing and pre-sloped designs to ensure proper drainage. For those seeking curbless access, the KERDI-SHOWER-LT and -LTS trays are designed to integrate seamlessly with the KERDI-LINE linear drains, facilitating single-plane slopes ideal for large-format tiles and barrier-free entry.
These systems not only simplify the installation process but also enhance the longevity and reliability of your shower build. By combining these high-quality components with expert support from GTD Supply, you can confidently embark on your shower project, knowing you have the right tools and guidance to get the job done right — the first time.
Frequently Asked Questions
Can Schluter shower trays be cut to fit custom sizes?
Yes. The expanded polystyrene foam material is easy to trim using a utility knife or handsaw, making it simple to fit irregular spaces or existing layouts.
What types of tiles can I use with a Schluter tray?
You can use any tile that is rated for wet areas — such as ceramic tile, porcelain tile, granite tile, marble tile, travertine tile, slate tile, limestone tile, sandstone tile, onyx tile, quartzite tile, or mosaics larger than 2" x 2"—as long as the size is appropriate for the slope and drain configuration.
How do I choose between a point drain and a linear drain?
Point drains are ideal for standard layouts and work well with smaller tiles, as the floor slopes from all directions toward a central drain. Linear drains, on the other hand, offer a more modern look and are especially suited for large-format tiles and curbless designs, as they allow for a single-plane slope and flexible placement along walls or entrances.
Are Schluter trays good for DIY installations?
Absolutely. Schluter®-KERDI-SHOWER trays are ideal for DIY installations. Their lightweight, prefabricated design simplifies handling and positioning, and the integrated waterproofing membrane reduces installation steps. Comprehensive resources, including clear instructions, detailed installation guides, and step-by-step videos, are available to guide homeowners through the process. With the right tools and a bit of research, many users find they can tackle the job themselves confidently.
Before beginning, ensure your subfloor is level and structurally sound. With proper preparation and attention to detail, installing a Schluter®-KERDI-SHOWER tray can be a manageable project for a dedicated DIYer.
