Tile Types: Rectified Edges, Glaze Finishes, Formats — How to Choose

Tile is often chosen from a catalog photo alone — “marble-look” or “concrete-look” — while three parameters that actually determine how it looks and performs on site get skipped: edge treatment, glaze finish, and format. The same design can exist as rectified or standard edge, glossy or matte, in sizes ranging from a mosaic chip to a 1600×3200 mm slab — and each combination means different cost, different installation, and a different result. Here’s what these parameters mean and how to read a spec sheet before you order.

Rectified vs calibrated: what happens to tile edges

Caliber is the actual size of a tile after firing. Ceramic bodies shrink unevenly in the kiln, so even within one batch the size drifts by fractions of a millimeter — packaging marks this with a separate number (e.g. “calibro 2”).

Rectification is mechanical trimming of all four edges with a diamond blade to an exact size after firing. Caliber variation is eliminated and the edge becomes perfectly straight and sharp.

• Rectified tile. Can be laid with a joint as narrow as 1.5–2 mm — floors and walls read as nearly seamless, and stone- or wood-look patterns flow across the joint without visible breaks. Costs 10–20% more than non-rectified tile due to the extra processing step.
• Non-rectified (standard/cushion edge). The edge is slightly rounded, and a 3–4 mm joint is needed to hide the natural size variation between tiles. Cheaper, but with a more visible grout grid — the classic look for country and traditional interiors.

For modern interiors with large-format tile and minimal joints, rectified edges are mandatory — standard tile can’t achieve an even layout across a large area.

Glaze types and surface finishes

• Glazed (GVT, Glazed Vitrified Tile). Color, pattern, and shine come from a thin glass-like layer over a dense base. The widest design range and the most affordable price, but a chip reveals the lighter base body underneath, and the glaze wears faster than the tile body itself.
• Unglazed / full-body (technical). Color runs through the entire thickness. Chips are invisible and abrasion resistance is maximal — the standard for heavy commercial traffic.
• Glossy / polished. Mirror shine, the most premium visual effect. Polishing removes the top layer and opens up the pores — stain resistance drops and the slip rating falls to around R9. Dry zones only.
• Matte. Doesn’t show fingerprints or glare, reads calmly over a large area. The default choice for residential floors.
• Satin / semi-matte. A soft, subtle sheen without the mirror effect — a middle ground between gloss and matte, popular for bathroom and kitchen walls.
• Structured / textured (anti-slip). An embossed surface with a slip rating of R10–R13 — required for terraces, pool decks, and any wet zone.
• Lappato (semi-polished). Partial polishing leaves part of the surface matte and part glossy. Combines a striking look with acceptable grip (R10) — popular for living room floors in premium interiors.

Tile formats: from mosaic to slabs

Format	Typical sizes	Where it’s used
Mosaic	20×20–50×50 mm chips on a 300×300 mm sheet	Backsplashes, pools, accent zones, shower floors
Subway	75×150–100×200 mm	Kitchen backsplash, bathroom walls, retro/loft interiors
Standard	300×300–600×600 mm	Residential floors and walls, bathrooms
Mid-format	600×1200–800×800 mm	Open-plan spaces, commercial floors
Large format	900×1800–1200×2400 mm	Seamless floors, walls with minimal joints
Slabs (extra-large)	1600×3200 mm and up, 3 mm+ thickness	Countertops, ventilated façades, furniture fronts

The larger the format, the fewer joints and the calmer a surface reads over a large area — but requirements on substrate flatness rise too (large format doesn’t forgive an uneven subfloor), and so does the logistics burden: slabs travel in vertical A-frame crates and can only be unloaded with proper rigging, since an 80–120 kg panel cracks from a single point impact.

Shade variation groups V0–V4: why tile “doesn’t match” on site

V (Variation, ANSI/ISCAG scale) describes how much individual tiles within one batch differ from each other in pattern and tone:

Group	Pattern variation	Typical use
V0	Nearly uniform, no visible pattern	Solid-color porcelain, technical flooring
V1	Minimal variation	Concrete-look tile, minimalist interiors
V2	Moderate variation	Mid-variation stone-look tile
V3	Pronounced variation	Marble- and travertine-look tile
V4	Maximum variation, every tile unique	Premium natural stone and wood imitation

A mistake that ruins the look of a project: ordering V3–V4 tile without understanding that the pattern will vary noticeably from tile to tile — that’s built into the technology, not a defect. The reverse problem also happens: batches from different production runs of the same SKU can differ in tone even within the stated V group, which is why the entire volume for one project is always ordered from a single batch — more on shade-matching risk and acceptance checks in our guide to sourcing tile and porcelain from China.

How to choose tile for the job

Application	Edge treatment	Glaze/surface	Format
Living room floor, minimal joints	Rectified	Matte / lappato	Large format 900×1800+
Kitchen backsplash	Either	Glossy / satin	Subway or mosaic
Bathroom walls	Rectified	Satin / matte	Standard 300×600–600×600
Terrace, pool deck	Rectified	Matte structured R11–R13	Standard–mid format
Ventilated façade	Rectified	Unglazed, full-body	Slabs
Classic / country interior	Non-rectified	Glazed matte	Standard 200×200–300×300

Wear rating (PEI, surface abrasion resistance) and slip rating (R) are separate parameters, not directly tied to format or edge treatment — see our detailed guide on porcelain tile types and PEI rating.

What to lock into the spec sheet when ordering from a factory

• Rectified or standard edge — and the corresponding grout joint width in the installation plan.
• Surface finish (glaze, gloss, matte, structured) and slip rating R for wet zones.
• Shade variation group V, and confirmation that the entire volume ships from one production batch.
• Exact format and thickness — for large format and slabs, confirm max panel weight and packaging type (A-frame) separately.

Pre-shipment inspection checks caliber, tone, and packaging integrity of every pallet against the approved sample — a standard part of quality control when sourcing finishing materials from China.

Sourcing tile from China through Dream View

Dream View is a sourcing agent with a fixed 10% commission on order value. We match factories to the specific format and finish you need — from rectified large-format tile for a minimalist interior to mosaic and subway tile for a retro project — lock in the shade variation group and batch before production starts, and verify caliber during pre-shipment inspection.

Outfitting a villa, hotel, or apartment and not sure which tile format and finish fits the job? Email us at orders@dreamviewchina.com or request a quote on our services page — we’ll shortlist factories and estimate cost and delivery for free.