What is a "Tile Ready" surface?

As it pertains to receiving Artaic mosaic tile (typically glass, porcelain, or sintered glass mosaics supplied on clear polymer-face or mesh backing), "Tile-Ready" defines a finished surface substrate that meets specific structural, dimensional, and chemical standards required to achieve a permanent bond under exterior freeze-thaw conditions.

A surface is considered Tile-Ready only when it satisfies the following six criteria:

1. Planar Flatness (1/8" in 10ft)

Because mosaic tiles (often 1/2" x 1/2" to 1" x 1") conform directly to the contours of the surface, any unevenness, lip, or bow in the backer panel will immediately telegraph through to the finished artwork.

• Requirement: Surface variation must not exceed 1/8" over 10 feet (and no more than 1/16" variation over 2 feet) per ANSI A108.02 standards.

2. Dimensionally Stable & Low Thermal Expansion

Especially for outdoor installations, the substrate must have a Coefficient of Thermal Expansion (CTE) closely matched to glass and ceramic (6-8 ^10-6 / °C).

• High-expansion substrates (such as exposed aluminum or unreinforced plastics) will expand and contract significantly faster than the mosaic under extreme temperature swings (-10°F to 95°F), shearing the thin-set mortar bond over time.
• Crack isolation layers can help with this issue.

3. Porous & Mortar-Bond Compatible (Non-Gummy)

The surface layer must provide sufficient porosity and surface energy for polymer-modified thin-set mortars (e.g., ANSI A118.4 / A118.15) or epoxy adhesives (LATAPOXY 300) to form a mechanical and chemical key.

• Glass-mesh reinforced cementitious surfaces, fiber-cement boards, or cementitious basecoats are tile-ready.
• Smooth plastics, bare metals, oil-coated wood, or highly flexible painted surfaces are not tile-ready without a bonded scratch coat or specialty primer.
• We've seen tile successfully installed onto existing Gypsum board in stable indoor locations. This is not the standard, but we've seen it done successfully.

4. Deflection-Free Rigid Backing (L/360 or L/600)

Tile and mortar are rigid in tension. Under wind-load, suction, or mechanical handling, the substrate cannot flex beyond strict limits.

• Requirement: Maximum deflection under load must not exceed L/360 for ceramic tile or L/600 for glass mosaic panels (L = span between supports/standoffs).

5. Waterproof & Freeze-Thaw Stable

For exterior installations, the substrate itself must not absorb water, degrade, delaminate, or rot when exposed to moisture and freezing temperatures.

• Moisture trapped behind mosaics during freeze cycles causes spalling if the substrate swells or degrades. A fluid-applied waterproofing/crack-isolation membrane (e.g., LATICRETE HYDRO BAN®) is typically required over the backer board before adhesive application.

6. Clean, Dry, and Contaminant-Free

The face must be entirely free of dust, oils, release agents, laitance, or loose particles that would act as a bond breaker.