Tile Glossary: A-Z Guide to Tile Terms & Definitions

A comprehensive reference guide to common tile industry terms, covering materials, installation methods, tools, and finishes.

A

Absorption Rate
The amount of water a tile absorbs, measured as a percentage of its dry weight. Tiles are classified as Impervious, Vitreous, Semi-Vitreous, or Non-Vitreous based on this rate. Lower absorption tiles are better suited for wet or outdoor areas.

Accent Tile
A decorative tile used to break up a field of standard tile, often featuring a contrasting color, pattern, or texture.

Adhesive
A bonding material (thinset, mastic, or epoxy) used to attach tile to a substrate.

Antiquing
A finishing process that gives tile, especially natural stone, an aged or weathered appearance.

B

Backer Board
A rigid panel (cement board, fiber cement, or foam board) installed over a subfloor or wall to create a stable, water-resistant surface for tile installation.

Backsplash
A protective and decorative tile surface installed on a wall, typically behind a kitchen counter or bathroom sink.

Bond Coat
Another term for the adhesive layer (usually thinset mortar) that bonds tile to the substrate.

Bullnose
A tile with one rounded edge, used to finish exposed edges cleanly, such as at the end of a backsplash or around a window.

Bisque
The unglazed, fired clay body of a ceramic tile before any glaze is applied.

C

Caulk
A flexible sealant used in movement joints, corners, and where tile meets another material (like a tub or countertop), where rigid grout would crack.

Cement Board
See Backer Board.

Ceramic Tile
Tile made from clay and other natural materials, fired at high temperatures. Generally softer and more porous than porcelain.

Coefficient of Friction (COF)
A measurement of a tile surface's slip resistance. Higher COF values indicate better traction, important for wet areas and floors.

Crackle Glaze
A decorative glaze finish featuring a fine network of intentional cracks for an artisanal look.

Cure Time
The time required for thinset, grout, or adhesive to fully harden and reach maximum strength.

D

Decorative Tile
Tile designed primarily for visual interest rather than structural or functional purposes, often used as accents or inlays.

Deco Tile
A shortened industry term for decorative tile, often featuring raised patterns or hand-painted designs.

Dry-Set Mortar
See Thinset.

E

Efflorescence
A white, powdery mineral deposit that can appear on tile or grout surfaces, caused by water carrying salts to the surface as it evaporates.

Encaustic Tile
Tile with a pattern inlaid into the body (traditionally cement-based) rather than printed or glazed on the surface, so the design doesn't wear away.

Epoxy Grout
A highly durable, stain- and chemical-resistant grout made from epoxy resins and hardeners, often used in commercial or high-moisture settings.

Expansion Joint
A gap left in a tile installation to allow for natural movement caused by temperature and humidity changes, typically filled with caulk instead of grout.

F

Field Tile
The primary tile used to cover the majority of a surface, as opposed to trim, border, or accent tiles.

Float
A flat tool used to spread and pack grout into joints, or to level a mortar bed.

Frost-Resistant
A designation for tile that can withstand freeze-thaw cycles without cracking, important for outdoor applications.

G

Glaze
A glass-like coating applied to the surface of ceramic or porcelain tile, providing color, pattern, and protection.

Grout
A cementitious or epoxy-based filler used to fill the joints between tiles, adding stability and preventing debris or water infiltration.

Grout Float
See Float.

Grout Haze
A hazy residue left on the tile surface after grouting, typically removed with a damp sponge or specialized cleaner.

Grout Line (Joint)
The space between individual tiles, filled with grout.

H

Hardness Rating (Mohs Scale)
A scale used to measure the scratch resistance of tile and stone surfaces, particularly relevant for natural stone.

Herringbone Pattern
A classic tile-laying pattern where rectangular tiles are arranged in a zigzag, V-shaped design.

Honed Finish
A matte, smooth finish (common on natural stone) achieved by grinding the surface without polishing it to a shine.

I

Impervious Tile
Tile with a very low water absorption rate (0.5% or less), ideal for wet and exterior environments.

In-Stock Tile
Tile that is warehoused and readily available, as opposed to special-order tile.

Inlay
A decorative technique where contrasting materials or tiles are set into a surface to form a pattern or design.

L

Latex-Modified Thinset
Thinset mortar with added latex polymers for improved flexibility, adhesion, and water resistance.

Layout
The planned arrangement of tiles before installation, used to determine pattern, tile cuts, and grout line alignment.

Listello
A narrow decorative border or accent strip of tile, often used to frame a tile field or add visual detail.

Look Tile
Porcelain or ceramic tile manufactured to mimic another material's appearance, such as "wood-look" or "marble-look" tile.

M

Mastic
A pre-mixed adhesive used for wall tile installation in dry areas; not recommended for wet areas or floors due to lower water resistance compared to thinset.

Mesh-Backed Sheet
Small tiles (like mosaics) pre-mounted on a mesh backing for easier handling and installation.

Mortar
A cement-based mixture used as an adhesive (thinset) or as a leveling bed for tile installation.

Mosaic Tile
Small tiles, typically under 2 inches, often sold in sheets, used for intricate patterns, borders, or accent areas.

Movement Joint
See Expansion Joint.

N

Natural Stone Tile
Tile cut from quarried stone such as marble, granite, travertine, slate, or limestone, prized for its unique natural veining and texture.

Nippers
A hand tool used to make small, precise cuts or notches in tile, especially useful for curved cuts.

Non-Vitreous Tile
Tile with a high water absorption rate (over 7%), suitable only for dry interior applications.

O

Offset Pattern
A tile layout where each row is shifted (offset) from the row below, such as a running bond or brick pattern.

On-Center Spacing
The measurement from the center of one tile or grout joint to the center of the next, used in layout planning.

P

Penny Tile
Small, round mosaic tiles resembling coins, often used in bathroom floors and accent walls.

Polished Finish
A high-gloss, reflective finish achieved by grinding and buffing a tile or stone surface.

Porcelain Tile
A dense, low-porosity type of ceramic tile made from refined clay fired at very high temperatures, known for durability and water resistance.

PEI Rating
A durability rating (Porcelain Enamel Institute) from 0-5 indicating a tile's resistance to surface abrasion and suitability for foot traffic.

R

Rectified Tile
Tile that has been precisely mechanically cut after firing to achieve exact, uniform dimensions, allowing for very narrow grout lines.

Running Bond
A brick-like installation pattern where each row of tile is offset from the row above by a fraction of the tile's length (commonly one-third or one-half).

Rectangular Tile
Tile shaped as a rectangle rather than a square, commonly used in plank or subway layouts.

S

Sanded Grout
Grout containing fine sand particles, used for wider grout joints (typically 1/8 inch or more) for added strength.

Sealant
A protective coating applied to grout or porous tile (especially natural stone) to resist staining and moisture penetration.

Semi-Vitreous Tile
Tile with a moderate water absorption rate (3-7%), generally suited for interior use only.

Setting Bed
The layer of mortar or adhesive into which tile is set.

Slip Resistance
See Coefficient of Friction.

Spacers
Small plastic or rubber pieces placed between tiles during installation to maintain consistent grout joint width.

Subway Tile
Classic rectangular tile, traditionally 3x6 inches, named for its historic use in early 20th-century subway stations.

Substrate
The underlying surface (subfloor, wall, or backer board) onto which tile is installed.

T

Thinset Mortar
A cement-based adhesive, mixed with water or a latex additive, used to bond tile to a substrate. The most common installation adhesive for floors and wet areas.

Trim Tile
Specialty-shaped tile (bullnose, quarter-round, cove base, etc.) used to finish edges, corners, and transitions.

Trowel
A hand tool with a notched edge used to spread thinset mortar evenly across a substrate.

Tumbled Finish
A textured, weathered finish (common on natural stone) achieved by tumbling tiles with abrasive materials, giving softened edges and a matte surface.

U

Uncoupling Membrane
A thin membrane installed between the substrate and tile to allow for independent movement, reducing the risk of cracked tile from substrate flexing.

Unglazed Tile
Tile without a surface glaze, where the color runs consistently through the tile body -- common in quarry and some porcelain tiles.

Unsanded Grout
A smoother grout without sand, used for narrow grout joints (typically under 1/8 inch) and on polished or easily scratched surfaces.

V

Vitreous Tile
Tile with a low water absorption rate (0.5-3%), suitable for most residential interior and some exterior applications.

V-Cap
A trim tile shaped for countertop edges, providing a finished, rounded edge profile.

W

Wainscoting
Tile (or other material) applied to the lower portion of a wall, often finished with a decorative cap or trim, common in bathrooms and entryways.

Waterproofing Membrane
A liquid, sheet, or fabric-reinforced material applied beneath tile to create a water-impermeable barrier, essential in showers and other wet areas.

Wet Saw
A power tool that uses a water-cooled diamond blade to make precise, clean cuts in tile.

This glossary is intended as a general reference for tile terminology. For specific product recommendations or installation guidance, contact the Belk Tile team.