LATICRETE INSTALLATION OF GLASS MOSAIC TILES


All floor and wall surfaces to receive a glass mosaic tile installation should have a maximum variation of less than ¼” (6mm) in 10’O” (3m) from the required plane. All surfaces to receive a glass mosaic tile installation should also meet minimum deflection standards of L/360 of the span under all concentrated or distributed live and dead loads. It is the responsibility of the specifier and installer to veri’ the suitability for the setting materials, methods and cure times with both the glass mosaic tile manufacturer and LATICRETE International, Inc.

PREPARATION OF UNEVEN VERTICAL OR HORIZONTAL SURFACES

If the substrate to receive the glass mosaic installation is uneven then it will be necessary to level the surface with LATICRETE® 3701 Fortified Mortar Bed; or, LATICRETE 226 Thick Bed Mortar gauged with LATICRETE 3701 Mortar Admix. The leveling mortar is applied to the clean, damp substrate using a flat trowel to level the surface true to a maximum variation of less than ¼” (6mm) in lO’O” (3m). LATICRETE Leveling Mortars can be applied from a featheredge to ‘/“ (12mm) thick in a single application (for walls), For vertical installations requiring leveling of more than ’2V (12mm) then “scratch” the surface of the wet initial coat and allow the mortar to harden. The leveling coat can be directly applied to the hardened scratch coat.

Follow glass tile manufacturer’s specific installation requirements for minimum cure time of skim coat, leveling mortars or self-leveling underlayments.

Use only enough mortar to fill in the low areas of the surface and to make the entire surface level, plumb and smooth.
Allow leveling coat to cure for 24—72 hours at 70°F (21°C).

 

Wet area installations can be waterproofed with LATICRETE 9235 Waterproofing Membrane or LATICRETE Hydro BanTM.

NOTE: Some glass tile manufacturers prohibit the use of a waterproofing or crack isolation membrane under their tile. Follow glass tile manufacturer’s specific installation requirements for use of waterproofing membranes, antifracture membranes and vapor barrier placement.

INSTALLATION OF PAPER-FACE MOUNTED GLASS MOSAICS (PER ANSI A108.15):

Make sure that the substrate is clean, structurally sound, and free of any dirt, oil, grease, paint, sealers, form release agents, or curing compounds. Clean the surface with a damp spongejust before installation ofthe tile.

This installation requires that the same mortar mix used to set the glass mosaics is also used to grout the tile. This is commonly referred to as the One-Step Method. LATICRETE PermaColortM Grout mixed with LATICRETE 4237 Latex Additive is an ideal combination for this installation. For the one-step installation of paper-face mounted glass mosaic tile, mix 3 quarts of(2.9 L) of LATICRETE 4237 Latex Additive with 25 lbs. (11.3kg) of LATICRETE PermaColor Grout.

Place each sheet of glass mosaics face down and work a small amount of the mortar into the back of each sheet with a rubber grout float or the flat side of a trowel. Remove excess mortar from the back of the mosaic sheets with the straight edge of the trowel of float, This should fill all of the joints and leave a thin, wet layer of mortar on the back surface of the sheet. For sheets with varying thickness of glass mosaics then level grout to the thickest tile on the sheet.

Key the mortar into the substrate using the flat side of a trowel to initiate a bond coat. Using the appropriate sized V-notch or small square notch trowel (e.g. 3/16” [4mm] square notch), add more adhesive and notch the mortar in a horizontal, straight pattern. The freshly prepared sheet of glass mosaics is placed onto the fresh combed mortar on the floor or wall. After each sheet is placed, a flat wood block or mbber grout float is used to beat the face of the tiles and firmly embed the tilcs into the mortar. A minimum of 95% coverage of mortar to tile should be achieved after the beat in. Check to make sure that a flat, uniform surface is attained.

Note: DO NOT APPLY EXCESSIVE MORTAR ON THE SURFACE TO BE COVERED WITH MOSAICS. Too much mortar will squeeze up through the joints and produce an uneven finished surface, Excessive thickness of mortar can also slow the hardening of the mortar which means that the mortar will remain soft for an extended period and delay the removal of the paper mounting.

Transparent and translucent glass tiLes can show shadowing (ghosting) if the glass tile manufacturer’s installation instructions are not followed. Please be aware of visual and technical limitations with transparent and translucent glass tiles. A mock-up is strongly suggested to verify final appearance and acceptance.

Apply the remaining sheets and make sure that the vertical and horizontal grout joints line up and a consistent pattern is maintained.

The glass mosaic paper face mounting should be removed as soon as the tiles have set firm but the ‘grout” is still pliable enough to make adjustments and repair pinholes or voids in the grout. Use a sponge dampened with clean water to moisten the paper sheets covering the mosaics. Two or more applications of water may be needed to safely remove the paper facing from the tile. When the paper is properly saturated, peel the paper from the face of the tile being careful not to pull tile away from the mortar. Inspect the grout joints for pinholes and voids and fix as necessary. Within one hour of initial set, clean any residual glue and paper from the surface using alight, damp sponge and buff with a dry cloth. Follow with an application of the same mortar used to set the glass mosaics and grout the areas between each sheet as necessary.

INSTALLATION OF PAPER-FACE MOUNTED, BACK-MOUNTED, EDGE-MOUNTED, CLEAR FILM FACEMOUNTED GLASS MOSAICS, OR RESIN-BACKED/REAR COATED GLASS MOSAICS (per ANSI A108.16):

FOR SWIMMING POOL INSTALLATIONS OF BACK-MOUNTED (DOT OR MESH) AND EDGE MOUNTED GLASS MOSIAC TILE IT IS NECESSARY TO CHECK WITH THE MANUFACTURER OF THE TILE TO DETERMINE SUITABILITY AND TO SELECT THE ADHESIVE MORTAR TYPE.

Although ANSI standards allow for the installation of back-mounted mosaics with latex thin-set mortars, the unstable nature of these backings may not be entirely suitable for the long term performance of this type of tile installation when installed with latex thin-set mortar. LATAPOXY’ 300 Adhesive can be used to install most rear mesh mounted, dot mounted or resin backed mosaic tile; however, consult with the glass tile manufacturer for their specific installation instructions. For installation of resin-backed glass mosaic tile, please refer to TDS 150 “Installation of Resin-Backed Tile and Stone” or TDS 190 “Installation of Large Fonnat Glass Tile”.

Make sure that the substrate is clean, structurally sound, and free of any dirt, oil, grease, paint, seaters, form release agents, or curing compounds. Clean the surface with a damp sponge just before installation of the glass mosaic tile.

This installation requires that the glass mosaic tile be installed and grouted in separate procedures. This is conunonly called the Two-Step Method.

Use LATICRETE® 254 Platinum (white), LATICRETE 254 Platinum Rapid (white), LATICRETE 211 Powder (white) gauged with LATICRETE 4237 Latex Additive, LATAPOXY 300 Adhesive, or LATAPOXY SP-100 (for applications where a colored epoxy adhesive is desired) as the setting mortar. Key the mortar into the substrate using the flat side of a trowel to initiate a bond coat. Using the appropriate sized small square notch trowel, add more adhesive and notch the mortar in a horizontal, straight pattern. Using the flat side of the trowel, flatten the notches to attain a smooth, consistent setting bed. Place the glass mosaic sheets onto the fresh mortar and bring all surfaces to a true plane at the proper position. Use a flat wood block or rubber grout float to beat the face of the tiles and firmly embed the tiles into the mortar. A minimum of 95% coverage, of mortar to tile, should be achieved after the beat in.

Apply the remaining sheets and make sure that the vertical and  horizontal grout joints line up and a consistent pattern is maintained.

For paper face mounted glass mosaic tiles, the paper should be removed as soon as the tiles have set firm but the adhesive mortar is still pliable enough to make adjustments and repair pinholes or voids in thejoint(s). Use a sponge dampened with clean water to moisten the paper sheets covering the mosaics. Two or more applications of water maybe needed to safely remove the paper facing from the tile. When the paper is properly saturated, peel the paper ftom the face of the tile being careful not to pull tile away from the mortar. Inspect the groutjoints for pinholes and voids and fix as ncccssary. Within one hour of initial set, clean any residual glue and paper from the surface using alight, damp sponge and buff with a dry cloth. Follow with an application of the same mortar used to set the glass mosaics and grout the areas between each sheet as necessary.

Transparent and translucent glass tiles can show shadowing (ghosting) if the glass tile manufacturer’s installation instructions are not followed.

Note: DO NOT APPLY EXCESSIVE MORTAR ON THE SURFACE TO BE COVERED WITH MOSAICS. Too much mortar will squeeze up through the joints and produce an uneven finished surface. Excessive thickness of mortar can also slow the hardening of the mortar which means that the mortar will remain soft for an extended period and delay the removal of the paper mounting.

For back-mounted and clear film face-mounted glass mosaic tile, allow the setting material to harden for 24 hours minimum (vertical installation) and 48 hours minimum (horizontal installation) prior to cleaning tile face and then grouting.

Use warm water and a white scrub pad (or stiff nylon brush) to remove any residual setting material, glue or paper from the tile’s face prior to grouting. Allow the installation to air dry before grouting.

Grout using LATICRFTE PermaColorTM Grout; LATICRETE 1500 Sanded Grout gauged with LATICRETE 1776 Grout Enhancer; or, LATICRETE 1600 Unsanded Grout gauged with LATICRETE 1776 Grout Enhancer; or, LATICRETE SpectraLOCK PRO Grout* as specified. It is recommended that a test area be performed to determine suitability of grout with glass tile. Sand may scratch the surface of the tile.

NOTE: Some glass tile manufacturers will allow the use of an epoxy grout. If instances where epoxy grouts are acceptable use LATICRETE SpectraLOCK PRO Grout.

Notes: Exterior installations in hot and dry conditions can cause a rapid drying of the setting mortar. To obtain longer working time it may be necessary to dampen the substrate with a damp sponge immediately before the mortar is applied. Cold weather installations can slow the curing of the setting mortar. A longer waiting time may be required for the mortar to cure before the face-mounting (if present) can be removed or the installation can be grouted.

Expansion Joints: 
Expansion joints must be installed in accord with Tile Council of North America (TCNA) detail EJ171-current year. The expansion joints need to be brought through to the tile surface and treated with a flexible sealant. Use LATICRETE LatasilTM to treat the joints. Expansion joint requirements will vary due to application types and locations. An architect and engineer should be consulted when specifying expansion joint placement, construction and materiab.

Cleaning and Maintenance:
Check with the glass tile manufacturer for their recommendations on routine cleaning and maintenance requirements.

INSTALLATION OF LARGE FORMAT GLASS TILE TDS 190

Xnstallation of large format glass type tiles requires skillful installation technique. The following instructions are provided as a general guideline to cover most installations with large format glass tile. Always check with the glass tile manufacturer for their installation instructions. The owner or end user is responsible for determining the acceptability of the product. Due to the manufacturing process of most glass tile products, variations in tone, shade, color, and size should be expected. Please inspect each tile before installation begins. There are many types of glass tiles available; including transparent cathedral glass and many types of opaque or translucent glass. Some of these tiles may have special color backings. Due to their uniqueness, the glass tile manufacturer may have special instructions on their installation.

Prior to installation:
Most glass tile manufacturers require that their tile be scrubbed and rinsed with clean water to ensure proper adhesion. Allow the tile to dry completely prior to installation.

General installation for Floors and Walls 
The installation of a pre-constniction, on-site mock-up is strongly recommended to verify appearance and performance. The surface to be covered with glass tiles should be smooth and level to within 1/4(6mm) in 10’ (3m), If wall or floor surface is uneven, level the surface using LATICRETE 3701 Fortified Mortar Bed; or, LATICRETE® 226 Thick Bed Mortar gauged with LATICRETE 3701 Mortar Admix. Allow leveling coat to cure 24-72 hours at 70°F (2rC).

Once the substrate is prepared, an optional membrane can be installed prior to the tile installation. Use either LATICRETE Hydro BanTM or LATICRETE Blue 92 Anti-Fracture Membrane if a crack isolation membrane is required. Use either LATICRETE Hydro Ban or LATICRETE 9235 Waterproofing Membrane if a waterproofing/crack isolation membrane is required. Install and allow the membranes to cure in accord with their respective installation instructions.

NOTE: Some glass tile manufacturers prohibit the use of a waterproofing or crack isolation membrane under the tile. Consult with the glass tile manufacturer for specific installation instructions.

Use LATICRETE 254 Platinum (white); LATICRETE 254 Platinum Rapid (white); or, white LATICRETE 211 Powder gauged with LATICRETE 4237 Latex Additive to install the glass tile. At times an epoxy adhesive may need to be used (e.g. resin back, back-coated, or epoxy painted back, or as recommended by the glass manufacturer); for these applications use LATAPOXY® 300 Adhesive.

Use the flat side of a 1/4” x 1/4” (6mm x 6mm) square notch trowel to initiate a bond coat, firmly apply the thin-set material onto the substrate. Then, comb additional thin-set mortar in a horizontal direction using a 114” x 1/4” (6mm x 6mm) square notch trowel. Use the flat side of the trowel to knock down the ridges and create a smooth setting bed. Check for voids and fill in where necessary.

Next, back butter each clean and dry tile using additional setting material, Verify that 100% coverage has been achieved by removing a tile while the mortar is still fresh. You can also check the face of a glass tile before setting to verify coverage. Tiles must be dry prior to installation to avoid water spots on back of tile.

Apply glass tile into the wet thin-set using firm, even pressure to establish contact and eliminate any voids, Remove any excess setting material from in between tile edges, If voids or water spots in the adhesive are visible through the tile, then remove the tile and correct the installation at this point.

Allow the tile application to cure a minimum of 48 hours prior to grouting.

Once the tiles l:3ve curJ. use LATICREFF PermaCoiorTM Grout :o groin the installation. Conduct a small test area to verify recalls and coiuputibjlity with glass surface. Some glass surfaces ma’ scra:ch when a sanded grout is used. If an unsar.ded grout is necessan use LATICRETE l6 Unsanded Grout mixed with LATICRETE 1776 Grout Enhancer.

NOTE: Some glass tile manufacturers will allow the use of an epoxy grout. In these instances, use LATICRETE SpectraLOCKS PRO Grout.

Eyansion joints: 
Expansion joints must be installed in accord with Tile Council of North America (TCNA) detail EJ171-currcnt year. ‘[he expansion joints need to be brought through to the tile surface and treated with a f1eble sealant. Use LATICRETIt Latasil’” to treat the joints. Expansion joint requirements will vary due to application types and locations. An architect and engineer should be consulted when specifying expansion joint placement, construction and materials.

Cleanin2 and Maintenance:
Check with the glass tile manufacturer for their recommendations on routine cleaning and maintenance requirements.

NOTE: For more information on the installation of glass mosaic tiles consult LATICRETE TDS 145 Installation of Glass Mosaic Tile.”