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Tiling of Glass Mosaic onto Rendered Wall

Common problem involved when fixing low water absorption tiles at jobsite. The solution explains & shows the correct practice & application 
Method when fixing tiles in this situation


Traditional Tile Fixing System

  • Use of neat cement  or pure OPC cement only when fixing ceramic tile.
  • The traditional specification allows the use of cement sand mix.
  • The local application practices is to use just neat OPC cement
  • Using  OPC Cement will expose the installation with high Shrinkage factor.
  • Use of neat cement or pure OPC cement only when fixing low water absorption tile.
  • Using neat OPC Cement will result in a very low mechanical bonding effect onto the low water absorption tile surface.

Tile Microscopic

  • The porcelain tile  have less microscopic pores for better water absorption.
  • Less microscopic pores   will not allow for a good penetration of the cement fibre to give a good mechanical bonding effect .  

Cement Hyration Process

  • Cement sand mixture will only expose the tile to a bonding process that is called  a hydration process.
  • The hydration process is the chemicle process when cement  is mixed with water.
  • The Chemical reaction will result in the development of cementitious fibre that will interlocked between each other and penetrate into the surface  tile's body or substrate giving a bonding effect that call mechanical bond.

High Water Absorption

  • To determine the water absorption level of the tile, dropped some water onto the tile back. 
  • High water absorption tile absorp the water & leaves a water mark at the tile back.

Low Water Absorption Tile

  • The water will run off onto the tile back when dropped.
  • The water will not be absorped into the tile body & you will not see any water mark on the tile surface.

Tile Thermal Movement

  • For glass mosaic / homogeneous / low water absorption tile,  they have a higher thermal movement within the tile than other type of tile.
  • Tile adhesive that is deformable is the most suitable type of tile adhesive .  

2 operation system

  • 2 operation system tiling & grouting of glass mosaic, the applicator need to remove the excess tile adhesive from the tile joints before they can start to do the grouting work.
  • The uni system tile adhesive & grout eliminate this problem by allowing the installation & the grouting being done by a single material  & operation



1.Ensure wall  fully Cured.
  Checked the render wall 
  level with a 2m metal 
  Straight edge. Ensure 
  that the wall is free 
  from laitance, dust, 
  loose particle & etc.

2.Prepare the wall markings
3.Dampen the concrete, block 
  and render wall to reduce 
  water suction

4.Mix Belcem Fix & Grout with 
  Liquid Polymer or with Clean 
  Water for Belcem Fix & Grout SP. 
  Mechanical Mixing is recommended

5.Check the adhesive mix property 
  ie. non slip, non slump 

6.Trowel the adhesive at thickness of  
  3-4mm depending on the size 
  of mosaics being installed.

7.For pre-grout application 
  apply a thin coat at 3mm 
  thickness to mosaics sheets back.
  Beside applying the grout, 
  this will ensure good transfer 
  of tile adhesive to tile back &  
  also to ensure the tile back 
  is fully covered with tile adhesive

8.Lay the mosaics sheet into position  
  and slide the tile to break the 
  adhesive rib, this will ensure that 
  a solid bed fixing is achieve.

9.Tamp the adhesive to its finish 
   level with a flat trowel.

10.Wet the paper face mosaics with 
     water & remove the paper from the 
     mosaics sheets.

11.Work the adhesive grout into the 
     tile joints & Clean the excess 
     tile adhesive  grout with sponge 
     or damp cloth.

12.Let the adhesive grout cured for 24 hours 

Solution with the following weber products

Solution 2

webermix admix I

High Solid content, Water based emulsion polymer admixture for use with Belcem Cement based tile adhesive

Solution 3


Multi colored, water resistant, compressible cement based fine grout

Solution 4


High Solid content, Water based emulsion polymer admixture for use with Belcem Cement based grout