Fireplace Installation Edmonton: Large Format in Larkspur

Large Format 12 by 24 Tile Installation in Larkspur With Subfloor Reinforcement

This Larkspur renovation is a case study in why prep work decides whether a large-format tile install lasts five years or fifty. Before any tile went down, we cut and screwed a layer of plywood across the existing subfloor to bring the total subfloor thickness up to 1 1/4 inches. That is the minimum we require under 12 by 24 porcelain. The reward for that prep is what you see in the finished photos: a flat, lippage-free tile field in a 70/30 staggered pattern that wraps the living area, including the floor approach into the fireplace surround.

Why 1 1/4 Inch Subfloor Matters Under Large Format Porcelain

Tile fails for one reason more than any other: subfloor deflection. When a floor flexes more than L/360 (about a quarter inch over a 7 1/2 foot span), the tile assembly above it cracks at the weakest link, which is the grout joint or the tile centre. Purpose: a 1 1/4 inch subfloor stiffens the assembly enough to bring deflection well below the L/360 threshold required by tile manufacturers. Properties: the added plywood layer also creates a fresh, clean bonding surface for thin-set, free of the contamination an old subfloor accumulates over decades. Relationship: on a 12 by 24 large-format tile, this prep is non-negotiable. Skipping it is the single most common reason inherited installs come back with cracked tile within two or three winters.

70/30 Staggered Pattern for Large Format Tile

The floor was laid in a 70/30 stagger. Why not 50/50? Large-format porcelain rarely runs perfectly flat across its full 24 inch length; a tiny bow at centre creates lippage where a 50/50 brick lay would butt that high point against the next tile’s high point. The 70/30 offset spreads the joint location, breaks the visual linearity, and distributes any tile bow across the wall plane rather than stacking high points together. It is the offset pattern the Tile Council of North America has been recommending for large-format porcelain since 2010, and we use it on roughly every large-format floor we install.

Setting Material: 253 Gold Laticrete Mortar

The 12 by 24 tile was set in 253 Gold Laticrete Mortar. Purpose: a polymer modified mortar engineered for the demands of large-format porcelain on a wood subfloor. Properties: high bond strength, extended open time (which matters when you are buttering the back of a 24 inch tile and walking it over to its position), and a non-sag rating that holds the tile in plane during cure. Relationship: 253 Gold is the thin-set we pair with large-format porcelain on a properly reinforced subfloor. It is rated for back-buttered application, which is the right install method for any tile over 15 inches on a side per current TCNA standards.

Planning a large-format floor or fireplace floor in Larkspur or anywhere in southeast Edmonton? Call The Tile Experts at 587-333-9800 or request a quote.

Carrying the Tile Field Under the Fireplace Surround

One of the design moves on this Larkspur build was running the same 12 by 24 porcelain field tile straight under the fireplace surround rather than transitioning to a different material at the hearth. This is a cleaner look than the traditional hearth-stone-then-floor-tile detail, and it reads more modern. The continuous floor plane visually expands the room and grounds the fireplace as a wall feature rather than a separate floor object. For more on fireplace tile work see our fireplace and feature walls page.

Grouting With Prism for a Color Consistent Floor

We grouted the floor with Prism Grout. Purpose: a high performance, color consistent, stain resistant grout that handles foot traffic and floor wash water without picking up shading variation. Properties: calcium aluminate chemistry that resists efflorescence and color shift. Relationship: Prism is the grout we pair with 253 Gold on large-format floor installs because the two products are formulated to cure on the same timeline and the grout color stays consistent across hundreds of square feet.

Larkspur Renovation FAQ

How long does a large-format floor with subfloor reinforcement take in Larkspur?
For a typical living area of 250 to 400 square feet with plywood prep, 12 by 24 tile, and grout, plan on 6 to 10 working days depending on cure windows.

Do you always add a plywood layer for 12 by 24?
We add plywood whenever the existing subfloor is less than 1 1/4 inches total thickness, or when the floor shows any flex during the pre-install walkthrough. On a true 3/4 inch plywood subfloor over 16 inch on-centre joists, we add the second layer as standard.

Can large format tile run under a fireplace surround?
Yes, and we recommend it for a clean modern look. The tile is set to the framed face of the fireplace structure with the surround built up from there.

Floor and Fireplace Tile Installation in Larkspur and Southeast Edmonton

Larkspur is an established southeast Edmonton community east of Mill Woods with a stock of 1980s and 1990s single family homes now reaching the age for major flooring and fireplace refreshes. The Tile Experts install floors, fireplaces, kitchens, and bathrooms across Larkspur, Lakewood, Tweddle Place, and the rest of southeast Edmonton, plus Sherwood Park and the broader capital region. Contact us or call 587-333-9800 for a free in-home walkthrough.