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modwalls® Real Penny Mosaic™ Installation Guide

ModDotz Installation Guide Download PDF of Installation Guide

These instructions will serve as a guideline for the installation of our Real Penny Mosaic™ tile.
 We strongly advise you to hire a licensed professional tile installer to install this product.


It is important that you inspect your entire order to ensure that it is acceptable before installation. If for any reason you are dissatisfied with your order please contact us immediately at 877-439-9734 or

Installation Constitutes Acceptance.



modwalls® Really Penny Mosaic™ tile is suitable for both interior and exterior wall and floor applications in dry areas only.

Preparing the existing surface is the most critical task of any tile installation, but especially this one. The tile must be placed on a rigid, level, plumb and structurally sound surface to avoid problems. The surface should be clean, dry and free of contaminants that could prevent a good bond.

The recommended substrate is a cement backer board such as HardieBacker or concrete. Gypsum board may also be acceptable for interior dry installations only.



We recommend LATAPOXY 300 Adhesive as it is a chemical resistant, epoxy adhesive that will bond to most sound, clean surfaces. Adhesive spreads easily and cleans with water while fresh. LATAPOXY 300 Adhesive is a factory-proportioned kit consisting of epoxy resin, hardener and chemical resistant silica filler.


The necessary tools for tiling are: safety glasses, gloves, dust mask, bucket, 3/16" v-notched trowel, rubber grout float, sponge, adhesive, sanded or non-sanded grout, polyurethane sealant (optional), and a utility knife.

Surface Preparation:

  1. All surfaces should be between 60°F (16°C) and 90°F (32°C) and structurally sound, clean and free of all dirt, oil, grease, paint, concrete sealers or curing compounds. Rough or uneven concrete surfaces should be made smooth with LATICRETE Latex Portland Cement Underlayment to provide a wood float (or better) finish. Installation may be made on a damp surface. New concrete slabs must be damp cured and 28 days old prior to application. All slabs must be plumb and true to within 1/4" (6 mm) in 10 ft (3 m). Expansion joints shall be provided through the tile work from all construction or expansion joints in the substrate. Follow ANSI specification A108.01-3.7 “Requirements for Movement Joints: Preparations by Other Trades” or TCNA detail EJ-171 “Movement Joints—Vertical & Horizontal”. Do not cover expansion joints with mortar.
  2. Note: Temperature will effect working properties of LATAPOXY® 300 Adhesive. Warm temperatures will speed curing and shorten working time. Cool temperatures will slow curing and require longer time to traffic. Store LATAPOXY 300 Adhesive at 70°F (21°C) for 24 hours prior to use.
  3. DO NOT bond to particle board, OSB, luan, Masonite® or hardwood surfaces.


  1. Pour LATAPOXY 300 Adhesive Part A and Part B into a clean mixing pail and mix thoroughly. Add LATAPOXY 300 Part C Filler Powder and mix to a smooth, trowelable consistency. Mortar is ready for use immediately after mixing. The consistency should be like peanut butter.


  1. Apply a consistent layer of the mortar adhesive to the substrate with the trowel. Prevent the adhesive from drying out by working in small areas. Form rows of ridges by dragging the notched side of the trowel through the layer of adhesive.
  2. Note: Use the proper sized notched trowel to ensure full bedding of the tile. Place mesh backed Real Penny Mosaic™ into wet, sticky mortar and beat in using a beating block and rubber mallet to embed tile and adjust level. Check mortar for complete coverage by periodically removing a tile and inspecting bedding mortar transfer onto back of tile.
  3. Cut all necessary tiles for edges and corners. Use a circular saw with a blade designed to cut metal. Protect your eyes, hands, and mouth from sharp metal edges and flying metal shards with safety glasses, gloves, and a dust mask. Cut with the finished side of the tiles facing up, and use a metal file or sandpaper to smooth the cut edges. Install the cut tiles using the same method you used with the mesh backed sheets.


  1. Allow thin-set to cure for 24 hours before grouting. Use LATICRETE® SpectraLOCK®† PRO Grout; LATAPOXY® SP–100 or LATICRETE SpectraLOCK 2000 IG Grout.
  2. Apply sanded grout with rubber grout float. Push grout between the pennies, making sure that all the grout joints have been filled and wipe away excess as you go. Leave the grout to dry for 10-20 minutes. Using a slightly damp sponge, wipe across the pennies to remove the grout film from the surface. Turn the sponge after each wipe, using each side of the sponge only once. Wait another 10-20 minutes or until grout starts to dry and repeat. Wipe pennies with a lint-free cloth as the final step buffing away all residual grout from the surface of the pebbles.
  3. Special Tip: Spray dry surfaces with a little water using a mister to minimize grout sticking to the face of pennies.


  1. Optional: after the grout has cured, seal the Real Penny Mosaic™ and grout with a polyurethane sealer. This will help prevent the pennies from oxidizing or discoloration at an undesirable rate. We recommend that you seal at least once per year in high-traffic locations.

Beware of Grout Haze:

Grout haze is a very thin layer of grout which has been allowed to dry on the surface of the tile. During installation the grout must be completely wiped from the tile surface and then the tops of the tiles buffed with a soft cloth to remove any residual grout film. Once the grout dries overnight there is little that can be done to remove grout haze, aside from washing the tile with one of the commercial acid grout haze removers.

Cleaning Real Penny Mosaic™ Tile:

A damp sponge or mop with a mild detergent is typically sufficient to keep this tile clean.


LATICRETE and LATAPOXY grouts require routine cleaning with a neutral pH soap and water. All other LATICRETE and LATAPOXY materials require no maintenance but installation performance and durability may depend on properly maintaining products supplied by other manufacturers.