Kerdi Waterproofed Shower Renovation in Rosslyn
Rosslyn is a quiet, mature north Edmonton neighbourhood west of 97 Street and just south of Yellowhead Trail, built largely through the 1950s and 1960s with steady infill since. The housing stock is now well into the second-renovation phase, and bathrooms are the most common scope. On this Rosslyn renovation The Tile Experts built a fully waterproofed Schluter Kerdi shower with a custom niche and bench, clad in 12 by 24 porcelain in a 70/30 staggered pattern with a 6-inch waterfall mosaic, set over a 12 by 12 floor in a straight lay. The full assembly is a textbook example of what a modern Edmonton bathroom build should look like behind the visible tile.
What a Schluter Kerdi Shower Actually Is
A Kerdi shower is a bonded sheet-membrane waterproofing system that lives between the cement-board substrate and the finish tile. The Schluter Kerdi Membrane is a fleece-laminated polyethylene sheet rolled into a polymer-modified mortar bed, with every seam, corner, and pipe penetration sealed by Kerdi-Band, Kerdi-Kereck preformed corners, and Kerdi-Seal collars. The result is a continuous watertight envelope wrapping the shower walls, the curb, the niche, the bench, and the floor pan. Water that gets through the tile and grout (and all grout is permeable to some degree) hits the membrane and runs down to the drain rather than soaking into the substrate. On any Edmonton shower that sees daily use, a bonded sheet membrane like Kerdi is the right call.
Niche and Bench: Why Both Get Built Inside the Membrane
The Rosslyn shower includes two custom inset features: a niche carved into the wet wall for shampoo and body wash, and a built-in bench for seated use. Both are framed in waterproof structure, both are wrapped in Kerdi membrane with preformed Kerdi-Kereck corners at every internal angle, and both are tied back into the main shower envelope with sealed Kerdi-Band seams. Built right, a niche and a bench are not weak points in the shower; built wrong (without continuous waterproofing through every internal corner) they become the first place a shower fails. Wrapping the framing inside the same membrane that wraps the main walls is what keeps the assembly watertight at every inside corner of the niche and every horizontal surface of the bench.
Premium Plus Mortar: The Setting Material the Kerdi System Requires
The Kerdi membrane install and the 12 by 24 wall tile were both set with Premium Plus Mortar. Purpose: Premium Plus is a polymer-modified thinset that meets ANSI A118.11 and A118.4, which is the spec Schluter publishes for any Kerdi-system installation. Property: the mortar has the open time and body to roll a Kerdi sheet into the bond coat without trapping air, burnish the seams with a hand roller, and then come back and set 12 by 24 porcelain over the membrane in the same product family. Relationship: using one polymer-modified bond coat below the membrane and above it keeps the entire assembly chemically compatible, with no mismatch between the mortar that adheres the waterproofing and the mortar that adheres the tile.
The 12×24 Walls: 70/30 Stagger With a Waterfall Mosaic
The shower walls carry a 12 by 24 large-format porcelain in a 70/30 staggered offset, broken by a 6-inch vertical waterfall mosaic that runs from the ceiling line down the back wall and continues across the shower floor. The 70/30 offset is the layout the Tile Council of North America recommends for large-format tile because of the slight bow that porcelain develops along its long axis during kiln cooling. A 50/50 brick lay puts the high point of one tile directly against the low point of its neighbour at every joint and produces visible lippage at eye level. A 70/30 offset breaks that alignment and the wall reads dramatically flatter. The waterfall mosaic gives the shower a focal axis, hides the linear drain in the visual continuation of the band, and links wall and floor as one finished surface rather than as two zones meeting at a corner.
Planning a Kerdi shower renovation in Rosslyn or anywhere in north Edmonton? Call The Tile Experts at 587-333-9800 or request a quote.
The 12×12 Bathroom Floor: VersaBond and a Straight Lay
The bathroom floor outside the shower carries a 12 by 12 porcelain in a straight lay, set with VersaBond Mortar. Purpose: VersaBond is a polymer-modified professional-grade thinset rated for ceramic and porcelain on cement-board and concrete subfloors, which is the correct setting material for a bathroom floor outside the wet zone. Property: the polymer modification gives the bond coat the flex to absorb the thermal cycling of a bathroom with intermittent hot-water use. Relationship: the 12 by 12 floor field is set in a true plane against the subfloor so the transition into the curbless or low-profile shower entry stays flush, without a step at the doorway.
Grouting With Prism: One Colour Across Walls and Floor
The completed shower and bathroom floor were grouted with Prism Grout. Purpose: running one grout colour across the 12 by 24 walls, the mosaic band, and the 12 by 12 floor unifies the room as one composition. Property: Prism is a calcium-aluminate grout that cures harder than standard portland-cement grout and resists efflorescence and stains, which matters on any joint that lives in a wet zone. Relationship: we walked the homeowner through three sample boards before mix day so the chosen tone matched the porcelain face under their actual bathroom lighting.
Rosslyn Kerdi Shower FAQ
How much does a Kerdi shower with niche, bench, and 12×24 walls cost in Rosslyn?
For a custom walk-in shower of 50 to 90 square feet with a Kerdi membrane assembly, niche, bench, and mosaic feature band, plan on 8,500 to 14,500 dollars in labour and material, depending on tile selection and drain configuration.
Why pay for a Schluter Kerdi assembly instead of a roll-on liquid membrane?
Both can work when installed correctly, but the bonded sheet system gives a verifiable membrane thickness at every point on the wall, where a roll-on membrane depends entirely on installer film-build at every square inch. On a long-life shower, the sheet system is the more predictable outcome.
How long does a full Kerdi shower take to build from demolition to grout?
For a single shower of this scope, plan on six to nine working days of tile work, plus a separate two to three days for plumbing rough-in and glass measurement before and after the tile phase.
Tile Installation in Rosslyn and North Edmonton
Rosslyn sits in mature north Edmonton west of 97 Street, with neighbours like Athlone, Calder, and Lauderdale forming a tight cluster of 1950s and 1960s housing now in active renovation cycles. Bathroom and shower rebuilds are some of the most common projects in this stock, often paired with main-floor flooring updates or a kitchen refresh. The Tile Experts install Kerdi showers, bathrooms, kitchens, floors, fireplaces, and feature walls across Rosslyn, Athlone, Calder, and the rest of north Edmonton, plus the full capital region. Contact us or call 587-333-9800 for a free in-home walkthrough.
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