Tile Nomenclature Guide: Every Term, Layer, and System Explained Clearly

Tile is simple on the surface.

But underneath every beautiful floor or shower is a layered system of materials working together. If one layer fails, the whole installation can fail. This guide walks you from basic terminology to advanced systems so you understand what you are actually paying for.

Tile Types

Start with the surface everyone sees.

Ceramic Tile

Clay based tile fired at lower temperatures than porcelain. Good for walls and light traffic areas. Affordable and versatile.

Porcelain Tile

Denser and fired at higher temperatures. Water absorption under 0.5 percent. Excellent for floors and wet areas. Strong, consistent, reliable.

Natural Stone

Marble, travertine, slate, limestone. Beautiful and organic. Requires sealing and skilled installation. It is premium but demands respect.

Mosaic

Small format tile mounted on mesh sheets. Excellent for shower floors where slip resistance matters.

Substrate and Structure

Tile is only as good as what it sits on.

Subfloor

Structural layer attached to joists. Usually plywood or OSB. It carries load. Tile does not.

Underlayment

Layer installed over subfloor to create a stable tile base. Prevents cracking and isolates movement.

Cement Board

Also called backer board. Brands include HardieBacker and Durock. Moisture resistant panel used in wet areas.

Foam Backer Board

Lightweight waterproof board. Brands include Schluter Kerdi Board and Wedi. Combines structure and waterproofing in one panel.

Uncoupling Membrane

Separates tile from subfloor movement. Schluter Ditra is the most recognized brand. Prevents stress cracks from transferring upward.

At Solara, this layer is never skipped. Movement happens in homes. The system must absorb it.

Waterproofing Systems

Water is patient. Your system must be smarter.

Liquid Applied Membrane

Paint on waterproof barrier such as RedGard. Creates a flexible moisture seal over cement board.

Sheet Membrane

Roll applied waterproofing layer. Schluter Kerdi is widely used. Provides consistent thickness and controlled performance.

Shower Pan System

Pre sloped foam trays or mortar bed systems. Schluter, Wedi, and Laticrete offer integrated kits. Proper slope is critical. No slope means standing water.

Setting Materials

This is the chemistry that bonds everything together.

Thinset Mortar

Cement based adhesive that bonds tile to substrate. Modified thinset contains polymers for flexibility and strength.

Large Format Mortar

Designed for large tiles. Prevents sagging and supports heavy material.

Grout

Fills joints between tiles. Cement grout is common. Epoxy grout offers stain resistance and durability.

Expansion Joint

Flexible joint that allows movement. Often silicone based. Prevents cracking in corners and long runs.

Layout and Finish Terms

Details determine whether it looks custom or careless.

Lippage

Uneven tile edges. Professional installers minimize this through leveling systems and substrate prep.

Tile Leveling System

Clips and wedges that keep tiles flush during curing.

Bullnose

Rounded finished edge tile used for clean transitions.

Schluter Trim

Metal edge profiles used instead of bullnose. Clean modern finish.

The difference between a tile job that lasts ten years and one that lasts thirty is rarely the tile itself.

It is the layers beneath it. The system. The discipline. The understanding.

At Solara, we treat tile as a structural finish. It must perform before it impresses.

— Solara

Precision beneath the surface. Beauty above it.