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Schluter: creativity, craftsmanship, and a complete installation system lead to stunning project

This project feature reinforces our understanding of some market trends, while demonstrating unique installation methods and the timeless value of craftsmanship. It begins with an addition to an older couple’s home that includes a spacious new bathroom. The modern appointments of a tiled shower and heated floors are to be found, but there are some twists that make the project particularly interesting.

Corona installed the Schluter®-DITRA-HEAT system to provide floor warming throughout the bathroom and ensure a lasting tile application.

The builder and the tile contractor

Case Builders LLC of Lutherville, Md., specializes in design, consultation, and fine construction. They manage a multitude of projects of varying levels of complexity throughout the Mid-Atlantic and represent their clients’ construction interests throughout the United States and abroad.

NTCA member Corona Marble & Tile of Woodbine, Md., is a family-owned tile and stone contractor established in 1985, that serves the Baltimore, Annapolis, and Washington D.C. areas. Led by second generation owner/installer Mike Corona, the company takes pride in its ability to collaborate with owners, builders, designers, and architects and successfully complete intricate projects that demand the highest attention to detail. This commitment to quality and longevity is evident in Corona’s employment of Certified Tile Installers (CTIs). For more information on the CTI program, you can visit ceramictilefoundation.org.

floor warming was installed throughout, using 3-2-3 cable spacing to maximize the warmth provided by the system

Applications

Calacatta Gold stone tiles supplied by Chesapeake Tile & Marble of Owings Mills, Md., were installed throughout the 15’ x 9’ bathroom, including the
6-1/2’ x 5-1/2’ shower. This white marble with deep gray veining produced a classic look that was very much at home in the open space with large windows and abundant natural light.

Heated floors

One of the primary homeowner requirements was to ensure comfort by incorporating a floor-warming system under the tiles. The addition was built over a crawl space so the system helps to mitigate transfer of cold from the space below. 

The framed shower floor area was built 2-1/2” lower than the rest of the addition to allow the mud bed floor to be flush with the bathroom floor.

Corona installed the Schluter®-DITRA-HEAT system to provide floor warming throughout the bathroom and ensure a lasting tile application. The DITRA-HEAT-DUO uncoupling membrane features studs on the surface that secure heating cables without the use of clips or fasteners and a thermal break attached to the underside. The cables were placed wherever heat was desired and the tile was installed directly over the membrane without encapsulating the cables in a self-leveling underlayment, thereby significantly reducing installation time. The sub assembly consisted of engineered wood joists covered with a 3/4”-thick AdvanTech® subfloor, and 1/2”-thick plywood underlayment to support the stone tile installation.

Curbless shower 

The entire shower base was covered with the Schluter®-KERDI waterproofing membrane after the floor warming system was installed, per Schluter Systems instructions.

Curbless showers continue to grow in popularity for both practical and aesthetic reasons. They can make a space feel more open, and the ease of entry can help homeowners age in place if desired. Since the bathroom space was part of an addition to the house, the builder was able to plan for this from the outset. He recessed the floor joists within the shower area 2-1/2” to allow for slope to the drain without requiring extra buildup of the floor outside the shower. Corona floated a mortar bed sloped to the Schluter®-KERDI-DRAIN in the center of the shower. Since there would be no curb, it was simple to continue the DITRA-HEAT-DUO membrane and heating cables across the shower entrance and over the surface of the mortar bed. While the uncoupling membrane is itself waterproof and the heating cables are rated for wet applications, the entire shower base was covered with the Schluter®-KERDI waterproofing membrane per Schluter Systems instructions. The walls were constructed using Schluter®-KERDI-BOARD as a lightweight and easy-to-install alternative to backerboard covered with a membrane.

Floating shower bench 

The floating bench is a 76” long 3 cm-thick marble slab supported by hidden steel brackets.

Shower benches serve practical purposes in tiled showers, and the sleek appearance of a floating bench can make for an elegant design feature. The owners desired a single piece of stone spanning the full length of the 76” wall without visible supports. 

Corona met this challenge using a clever approach. An approximately 12” wide strip of foam board was removed from the length of the wall and iron L-shaped brackets, 12” long on each side, were fastened to solid blocking within the wall framing. The previously-removed board was routed using the brackets as a guide and re-installed so that it would again sit flush with the rest of the wall. Special care was taken to waterproof the area around the brackets and prevent any water infiltration into the wall cavity. A 3 cm-thick marble slab with 4” deep mitered face was installed, with the underside subsequently covered with a layer of foam board and porcelain tile. The brackets provide the necessary support and are invisible within the final application.

Supports for the slab bench were anchored to the framing and then covered with Kerdi-Board building panels that had been routed to fit flush over the brackets.

Arched entrance

Field tile was cut and aligned to fit the underside of the arch and maintain the veining for a seamless, dramatic effect.
There are knee walls on either side of the opening, with an archway above that nearly reaches the ceiling

Perhaps the most striking visual feature of the shower is the entrance itself. Corona is particularly proud of this aspect of the project and rightfully so. There are knee walls on either side of the opening, with an archway above that nearly reaches the ceiling. He painstakingly cut and aligned field tile to fit the underside of the arch and stone chair rail to form the casing. The tile was installed so that the veining in the Calacatta Gold follows the arch to dramatic effect.

Conclusion

This project is an excellent example of how homeowners, builders, and tile setters can work together to produce something really special. The clear communication of requirements by the homeowners, followed by excellent planning and execution by Case and Corona Marble & Tile was the key to success. Using a complete system per manufacturer instructions, combined with plenty of creativity and craftsmanship helps empower tile setters to produce functional, durable, and beautiful results, all within a profitable business.

Sean Gerolimatos
Director of Research and Development at

Sean Gerolimatos is the director of research and development for Schluter Systems LP. He has been with the company since 2003. Gerolimatos has served as a member of the Tile Council of North America's Handbook Membrane Committee, the National Tile Contractors Association's Technical Committee and has written articles for numerous trade publications. He is a popular speaker for such events as Qualifier and Surfaces. Gerolimatos's academic background is in civil engineering. He has a bachelor's degree from Clarkson University and a masters from Cornell University.