Large-format tile installation in St. George: what to know before choosing 24×48 tile

Large-format tile can make a St. George home, custom build, or commercial space feel quieter and more expansive. Fewer grout joints put more attention on the tile itself—but they also make preparation and layout decisions harder to hide. Before ordering 24×48 porcelain or another oversized product, review the complete installation rather than treating tile size as a finish choice alone.

This guide explains the questions that help an installer evaluate the work accurately. The exact requirements still come from the selected tile, setting materials, substrate, building conditions, and current manufacturer instructions.

Confirm the exact tile and intended surface

Send the product name, nominal and actual dimensions, thickness, finish, shade or variation rating, edge type, and manufacturer data sheet. Also identify every intended surface: floor, shower wall, dry wall, fireplace, exterior area, or commercial space. A product available in a large size is not automatically approved for every location.

For porcelain, natural stone, and gauged panels, handling and installation needs can differ substantially. If the design mixes field tile, mosaics, trim, or stone, list each product separately. This lets the installer check compatibility, finished thicknesses, transitions, and whether the supplier recommends a particular mortar or joint width.

Flatness comes before setting the tile

A large tile bridges more of the surface at once, so dips, humps, bows, and abrupt changes can make adjacent edges harder to align and reduce mortar contact. Tile-leveling clips can help control the relationship between neighboring pieces while the mortar cures, but they do not flatten a deficient floor or wall underneath.

MAPEI’s surface-preparation guidance emphasizes a solid foundation, a flat substrate, appropriate mortar coverage, and the correct installation method for large-format tile. Ask how the substrate will be inspected and what preparation—such as grinding high areas, patching low areas, repairing damage, or using an approved underlayment—belongs in the scope.

“Level” and “flat” are not interchangeable. A surface may intentionally slope, as in a shower, and still need to be consistently flat within that plane. Do not assume a new slab, newly framed wall, or fresh backer board is ready without checking it.

Match the mortar and method to the assembly

The installer should select setting materials for the tile type and size, substrate, location, and service conditions. Manufacturer instructions govern mixing, open time, trowel selection, mortar thickness, surface preparation, and cure time.

MAPEI’s tile-installation overview discusses using mortars designed for large-format work and spreading mortar on the back of tile to improve contact. On the job, coverage should be checked by lifting representative pieces—not assumed from the trowel size or the use of clips. The goal is a supported tile assembly without avoidable voids, following the requirements for that location.

Do not buy mortar based only on a shelf label or reuse a specification from a different room. A shower wall, sun-exposed floor, fireplace surround, and interior dry floor can have different demands.

Approve the layout before installation begins

With 24×48 tile, moving the starting point by a few inches can change cuts across the entire room. Ask for the layout to address:

• the most visible sight lines and focal walls;
• doorways, halls, islands, cabinets, niches, drains, and plumbing penetrations;
• the direction of rectangular tile and any directional pattern printed on the back;
• balanced cuts at walls and outside corners;
• transitions to carpet, wood, LVP, stone, or another tile thickness;
• grout color, joint appearance, and any variation between pieces.

For visibly varied tile, review several pieces together rather than approving one sample. A dry layout or clearly marked layout discussion is especially useful when the material has strong veining, book-matched effects, or a repeating print.

Plan edges, transitions, and finished height

Large-format floors can affect the height at doors, cabinetry, appliances, toilets, floor registers, and adjoining materials. Walls need a decision for outside corners, window returns, niche edges, and exposed tile terminations. Those choices may use manufacturer trim pieces, fabricated tile edges, stone, or metal profiles depending on the design and material.

Schluter’s overview of tile profiles explains how profiles can protect exposed edges and form transitions between materials of equal or different thicknesses. Select the profile material, size, and finish with the actual tile in hand; a catalog image does not confirm a flush fit or color match.

Keep movement accommodation in the design

A large, continuous tile field may look best with uninterrupted lines, but the assembly still needs planned movement accommodation. Do not cover or bridge building movement joints with ordinary tile and grout. Perimeters, changes in plane, sun-exposed areas, and large fields need project-specific review under the applicable installation method.

Schluter notes that movement accommodation is necessary in floor tile applications and points installers to the TCNA Handbook’s EJ171 detail. The exact joint type and spacing should be determined for the project rather than copied from a general online example. Discuss these locations early so they become part of the layout instead of a surprise after tile is ordered.

Make sure the pieces can reach the room

Measure the path from delivery to installation: gates, stairs, elevators, hall turns, finished door openings, and working space. Oversized tile may require team handling, specialty cutting equipment, protected staging, and room to rotate a piece safely. A tile that fits the wall may not fit through the route to that wall.

For occupied remodels, ask where cutting and staging can occur and how nearby finishes will be protected. Builders and commercial teams should identify material-delivery rules, floor loading or elevator restrictions, working hours, water and power access, and who is responsible for moving tile to the installation area.

Order from an approved layout and keep replacements

Do not use a universal waste percentage. Quantity depends on room shape, pattern, tile size, required cuts, breakage risk, color or vein selection, and whether matching replacements may be difficult later. Have the supplier and installer review the approved layout, carton quantities, dye lot or caliber information, and lead time before the order is final.

Keep clearly labeled spare pieces after completion, especially for a distinctive or discontinued product. Store the product name, color, lot information, and care instructions with the extras.

What to send for a large-format tile estimate

Provide the project address, plans or measured sketches, current-condition photos, tile links and data sheets, room dimensions, intended surfaces, pattern direction, transition details, preferred schedule, and information about access. State whether demolition, substrate repair, waterproofing, floor preparation, baseboards, plumbing, electrical work, or other trades are part of the project.

Exquisite Tile provides large-format tile, floor preparation, showers, and luxury-finish installation for St. George and Southern Utah projects. Request an estimate and attach your plans and product selections before sending. Builders and commercial teams can also use the Builders & Commercial page and the related guide to preparing a clearer tile bid package.