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Tiling of Low Water Absorption Homogenous Tile 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

Problem

Render Preparation

  • Render are only let to cure for just 2-3 days only. 
  • Tiling onto substrate that is not fully cured  is tiling onto unstable substrate  with potential movement

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 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 .  

Solution

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     1.Ensure wall fully Cured.Checked 
       the render wall level with a 2m 
       metal Straight edge.

 

     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 
      ile back. 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 tile into position
       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 1

weberset x'tra flex

Flexible and improved adhesive for porcelain tile

weberset superflex 21

Tile adhesive for large Porcelain tiles on wall and floor

weberset CTF grey

Ceramic tile adhesive for interior wall and floor

Solution 2

webermix admix I

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

Solution 3

BELCEM FINE GROUT

Multi colored, water resistant, compressible cement based fine grout

Solution 4

BELCEM GT-MIX 1

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