A homeowner's guide to barrier-free showers, waterproofing, floor preparation, and professional installation in Orange County, California.
A Bathroom Designed for Today and Tomorrow
Bathroom remodeling is about more than choosing beautiful tile, fixtures, and finishes. It's an opportunity to create a space that is comfortable, functional, and built to serve homeowners for many years. One of the most significant developments in modern bathroom design is the growing popularity of curbless showers, also known as barrier-free or zero-threshold showers. Unlike traditional showers that require stepping over a raised curb, a curbless shower provides a nearly seamless transition between the bathroom floor and shower area. The result is a clean, open appearance that can make a bathroom feel larger and more luxurious. But curbless showers offer benefits beyond aesthetics. They can also improve accessibility, reduce tripping hazards, and help homeowners remain independent as they age.
At Shoreline Stone & Ceramics, we believe that a thoughtfully designed bathroom should combine beautiful craftsmanship with proper construction methods, dependable waterproofing, and long-term functionality.
Aging in Place: Designing Bathrooms for a Growing Population
The United States has experienced a substantial increase in its older population. According to the U.S. Census Bureau, approximately 49.2 million Americans were age 65 or older in 2016, representing 15.2% of the population. That was roughly one out of every seven Americans. Earlier population projections estimated that the number of Americans age 65 and older would reach approximately 72.1 million by 2030, approaching one in five Americans. These are historical projections, rather than a current 2030 population count. (census.gov, census.gov) As more Americans reach retirement age, many prefer to remain in their existing homes rather than relocate to assisted living facilities or other housing. This approach, commonly called aging in place, encourages homeowners to make practical improvements that support independence, safety, and comfort. Bathrooms are particularly important because traditional layouts can present challenges for people experiencing reduced mobility, balance difficulties, or limitations in strength and flexibility. A curbless shower can be an excellent starting point for a bathroom designed around long-term accessibility.
Curbless Showers Can Be Beautiful, Not Institutional
Accessibility does not have to mean sacrificing style. Today's barrier-free bathrooms can incorporate many of the same premium materials and design features found in luxury residential construction.
Large-format porcelain tile
Larger tiles can create a continuous appearance between the bathroom and shower floor. Fewer grout joints can also make routine cleaning easier, provided the tile format is compatible with the drainage design.
Built-in and floating shower benches
A properly constructed shower bench provides a convenient place to sit while bathing. For accessibility, seating height, support, placement, and load capacity should be considered during design.
Lower-positioned recessed niches
Shower niches can be positioned at a comfortable reaching height for seated users, reducing the need to bend, stretch, or stand to access bathing products.
Cantilevered or wall-mounted vanities
Floating vanities provide a contemporary appearance and can be designed with additional knee and toe clearance for wheelchair users. Not every floating vanity is accessible, so dimensions and plumbing placement matter. Other thoughtful features include slip-resistant tile surfaces, properly located grab bars or reinforced walls for future installation, handheld shower fixtures, accessible controls, and wider bathroom entryways. When incorporated early in the remodeling process, these details can become part of a cohesive bathroom design rather than appearing as modifications added later.
The Biggest Challenge: What Happens Beneath the Tile
Although curbless showers appear simple, they often require more technical planning than conventional shower installations. Traditional showers use a raised curb to help contain water within the shower enclosure. Removing that curb eliminates a physical barrier between the shower and the rest of the bathroom.
A curbless shower effectively blurs the boundary between wet and dry areas.
Water must be directed toward the shower drain through carefully calculated floor slopes, while the waterproofing system must protect the surrounding construction from moisture. A properly installed tile surface is not, by itself, a waterproof assembly. Grout joints, mortar beds, and many tile-setting materials can allow moisture to pass through. This makes the waterproofing system beneath the tile one of the most important components of the entire installation.
Waterproofing a Curbless Shower: Why the Entire Bathroom Floor Matters
Industry guidance for curbless showers is addressed in the TCNA Handbook for Ceramic, Glass, and Stone Tile Installation, including methods such as TCNA B422C, which addresses curbless shower construction using a bonded waterproof membrane. A bonded waterproofing membrane is installed directly beneath the tile assembly, helping prevent water from penetrating into the underlying floor and wall construction. Industry guidelines recommend extending waterproofing at least 12 inches beyond the shower area. Schluter also identifies this minimum in its curbless shower installation guidance. (ctasc.com, schluter.com) However, our preferred approach is to consider waterproofing the entire bathroom floor.
Why stop waterproofing just outside the shower when moisture can travel farther? Water can escape the immediate shower area through splashing, shower spray, drainage restrictions, or normal bathing activities. Extending waterproofing across the bathroom floor, sealing membrane seams, and properly treating floor-to-wall transitions provides a more comprehensive approach to moisture management. Schluter's KERDI waterproofing membrane, KERDI-BAND seam treatment, and appropriately detailed DITRA floor assemblies can be incorporated into a complete waterproofing system. The exact products and installation details must be selected according to substrate conditions, manufacturer requirements, and the applicable TCNA method. For homeowners investing in a luxury bathroom remodel, the cost of comprehensive waterproofing is often a worthwhile consideration compared with the potential expense of future water damage.
Creating Proper Drainage: Something Must Go Up or Something Must Go Down
One of the fundamental challenges of curbless shower construction is accommodating the necessary floor slope. A shower floor must slope toward the drain to allow water to flow properly. For many conventional residential shower installations, the design slope is approximately 1/4 inch per foot, subject to applicable plumbing codes and accessibility requirements.
In a traditional shower, the curb helps accommodate the elevated perimeter of the sloped shower floor.
In a curbless installation, that height difference must be resolved another way. There are several construction methods available, each with its own advantages, limitations, and structural considerations.
Five Ways to Construct a Curbless Shower
1. Prefabricated shower tray with a transition ramp
Prefabricated shower trays are manufactured with a predetermined slope toward the drain. Products such as Schluter KERDI-SHOWER trays can simplify installation by providing a consistent sloped surface that integrates with the manufacturer's waterproofing system. Where necessary, a transition ramp can connect the surrounding bathroom floor to the shower entrance. This approach may be suitable when the existing floor structure cannot easily be recessed. However, the transition must be carefully planned. A ramp that works aesthetically may not satisfy wheelchair-accessibility requirements.
2. Raising the surrounding bathroom floor
Another option is to raise the elevation of the bathroom floor to meet the shower perimeter. For example, a shower with a four-foot drainage run and a 1/4-inch-per-foot slope requires approximately one inch of vertical fall. Raising the surrounding bathroom floor may help accommodate that difference without modifying the underlying floor joists. The floor can be built up using suitable underlayment or other approved floor preparation methods. The primary disadvantage is that raising the bathroom floor can create a new elevation difference at the bathroom entrance. For wheelchair accessibility, even a relatively small change in elevation matters. Under ADA accessibility criteria, changes in level greater than 1/4 inch and up to 1/2 inch generally require beveling, while larger transitions require an appropriately designed ramp. A raised bathroom floor should not simply replace one accessibility obstacle with another.
3. Recessing the subfloor using structural ledgers or engineered framing
In wood-framed construction, the shower floor can sometimes be recessed between the existing floor joists. This method involves removing the existing subfloor within the shower footprint and creating a lower supporting surface using approved structural framing details. For example, a 3/4-inch plywood subfloor may be removed, and a new recessed subfloor installed between the joists using properly designed ledgers or other approved supports. The objective is to create additional depth for the sloped shower assembly while maintaining a flush transition with the surrounding bathroom. Products such as Schluter DITRA may then be used as part of the surrounding bathroom floor assembly to coordinate finished elevations. This method requires careful evaluation of joist construction, subfloor thickness, structural support, and plumbing clearance. Any modifications to structural framing should be reviewed for code compliance, with engineering where required. Engineered joists must not be cut or altered without specific approval.
4. Recessing the floor with Schluter KERDI-SHOWER-FRS brackets
A newer approach is the Schluter KERDI-SHOWER-FRS system. Introduced in 2026, this floor-recessing system uses specially designed galvanized steel brackets to support a lowered shower subfloor without conventional ledger framing.
The system incorporates two types of brackets:
J-Brackets: Installed along the tops of floor joists to support recessed subfloor inserts.
P-Brackets: Used at perimeter conditions, including along wall bottom plates and adjacent existing subfloor.
The system lowers the subfloor by approximately 11/16 inch and is designed for compatible dimensional lumber and engineered I-joists spaced up to 19.2 inches on center. Schluter recommends compatible thin-perimeter KERDI-SHOWER-TT trays and requires a KERDI-DRAIN point-drain configuration for this system. (schluter.com, schluter.com, schluter.com) This method can offer advantages for remodeling projects where maintaining structural framing and minimizing interference with existing plumbing or mechanical systems are important. However, it is not appropriate for every shower. Joist spacing, floor cavity depth, plumbing location, and finished floor elevations must all be evaluated before selecting the system. For more technical information, homeowners and contractors can consult Schluter's official KERDI-SHOWER-FRS installation instructions.
5. Entry linear drains and alternative drainage configurations
Linear drains provide another approach to curbless shower construction. Unlike a traditional point drain, which commonly requires the floor to slope from multiple directions, a linear drain can allow the shower floor to slope along a single plane. This can be particularly beneficial when installing large-format porcelain tile. A linear drain may be installed along the rear shower wall or, in certain designs, near the shower entrance. An entrance-positioned linear drain can intercept water near the transition between the shower and bathroom floor. However, its placement requires careful attention to splash containment, drain capacity, waterproofing continuity, and applicable code requirements. Entrance drains do not eliminate the need for proper waterproofing or floor slope. Depending on the design, additional drainage provisions may be required. For many luxury bathroom remodels, we particularly like the appearance of a wall-positioned linear drain paired with large-format porcelain tile. This arrangement can provide a clean, uninterrupted shower floor while minimizing grout joints. The best drain location ultimately depends on the shower dimensions, available floor depth, accessibility goals, and surrounding bathroom layout.
Accessibility Guidelines: ADA and Aging-in-Place Design
Two valuable technical resources for curbless shower construction are the Tile Council of North America (TCNA) Handbook and the U.S. Access Board's ADA Accessibility Standards. The TCNA Handbook provides recognized installation methods for tile assemblies, waterproofing, and shower construction. ADA guidelines address accessibility considerations such as maneuvering clearances, shower dimensions, changes in floor elevation, seating, grab bars, and fixture placement. For example, accessible shower designs may require slopes no steeper than 1:48 (approximately 1/4 inch per foot), and the entrance threshold must satisfy the requirements for the applicable shower type. Although private residential bathrooms are generally not required to meet ADA standards, these guidelines can provide a useful reference for homeowners planning to age in place. The goal should be to create a bathroom that is comfortable to use today while anticipating possible mobility changes in the future. Additional resources include the ADA Accessibility Standards and the Tile Council of North America.
Why Professional Installation Matters
Curbless showers require careful coordination between design, framing, plumbing, waterproofing, and tile installation. The finished shower may look simple, but the work beneath the tile is anything but. Improperly constructed curbless showers can experience drainage problems, water migration into adjoining areas, cracked tile, or moisture damage to the underlying structure. Important considerations include proper substrate preparation, appropriate floor slopes, compatible drainage components, continuous bonded waterproofing, correctly detailed floor-to-wall transitions, and water testing before tile installation. A properly designed shower should also account for how the water behaves during actual use, not simply how the floor appears on a drawing.
Our Approach to Curbless Shower Construction
At Shoreline Stone & Ceramics, we bring more than 30 years of tile installation experience to custom shower and bathroom remodeling projects throughout Orange County. Our approach has always been to build an installation correctly from the foundation up. We specialize in traditional mortar-floated shower construction, modern Schluter waterproofing systems, large-format porcelain tile, custom shower details, and carefully planned bathroom floor assemblies. When designing a curbless shower, we evaluate the existing construction and select an installation method suited to the project's structural conditions, drainage requirements, and design goals. Whether the priority is creating a beautiful contemporary bathroom or planning a safer, more accessible space for the future, our focus remains the same: proper preparation, dependable waterproofing, and quality craftsmanship built to last.
Planning a Curbless Shower Remodel in Orange County?
A curbless shower can transform the appearance and functionality of a bathroom. It can create a spacious, modern design while making daily use more convenient for homeowners of different ages and abilities. The key is planning the installation correctly before construction begins. If you're considering a curbless shower, barrier-free bathroom, or aging-in-place remodel, Shoreline Stone & Ceramics would be happy to discuss your project.
Shoreline Stone & Ceramics
Licensed Tile Contractor | Huntington Beach, California
Serving Orange County and surrounding communities
(714) 724-1400