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Pre-mounting mosaics methods (continued)

4. Lay an alkali-resistant fiberglass mesh over the backs of the tiles. 5. Apply an even coat of an ANSI A118.10 liquid water- proofing membrane with a brush (taking care not to al low excess in grout joints) and let dry.

8. With a level, check your piece for flatness. If more compression is necessary, replace the compression block previously used and use a compression tile tool. Clean excess mortar from perimeter of mosaic panel.

9. Allow to cure for appro priate period based on ad hesive mortar used (24-48 hours). Remove the face tape and clean any thinset mortar from the joints. Trim excess membrane from pe rimeter of mosaic panel.

Apply a second coat and let dry completely per manufacturer specifications, usually 24 hours.

10. Clean tile surface and apply new mosaic face tape (face tape shall be removed after installation and prior to grouting).

• It is recommended to produce a mock-up to ensure a prop er mortar bond • If glass tile is used, validate proper bond (ANSI A137.2) per manufacturer specifications • After installation, create soft joint at perimeter of mosa ic inlay as instructed by membrane manufacturer (ANSI A108.17) or, in the case of glass tile mosaics, refer to ANSI A108.16 METHOD 2: MESH WITH LIQUID WATERPROOFING MEM BRANE Recommended for varying thicknesses of materials used in mosaic

6. Cut through mesh into manageable pieces

7. Trim excess liquid wa terproofing membrane and fiberglass mesh from tile edges. 8. Flip sections over, re move mosaic mounting tape, clean grout joints, and reapply mosaic face tape.

1. Apply a suitable prim er, approved by the liquid membrane manufacturer, to the backs of clean and dry tiles and allow to dry per manufacturer instructions. 2. Lay out the pieces as they will be installed and place mosaic mounting tape over face of tile.

• It is recommended to produce a mock-up to ensure a prop er mortar bond • If glass tile is used, validate proper bond (ANSI A137.2) per manufacturer specifications • After installation, create soft joint at perimeter of mosa ic inlay as instructed by membrane manufacturer (ANSI A108.17) or, in the case of glass tile mosaics, refer to ANSI A108.16

3. Cut into manageable sections that can be labeled and flipped over.

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NTCA Reference Manual | 2024 / 2025

Chapter 5 | Material Specific Products and Installation