GENERAL SPECIFICATION FOR FIXING NATURAL STONE (LIMESTONE, QUARTZITE, SANDSTONE OR SLATE) TILES ONTO INTERIOR RENDERED WALLS, AND ONTO INTERIOR SURFACE BEDS AND SUSPENDED SLABS (PAGE 2)

GENERAL SPECIFICATION FOR FIXING NATURAL STONE TILES ONTO INTERIOR RENDERED WALLS (CONTINUED)

 

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• GROUTING
  NOTE : We recommend that the face of porous tiles be sealed before grouting to minimise the risk of the grout staining the tiles. This will also minimise water penetration into the installation.
  • Grouting must not be carried out until sufficient bond has developed between the bedding mix and the tiles to preclude disturbance of the tiles during the grouting operation. Allow a minimum of 4 hours before grouting.
  • ‘Dry’ Areas:
    • Option 1 :  TAL Quarrygrout
      • Use grey or coloured  TAL QUARRYGROUT for filling tile joints 5mm and wider.  TAL   QUARRYGROUT  is suitable for use in joints up to 25mm wide.
    • Option 2 :  TAL Stain Free Grout
      • Use Light Grey TAL STAIN FREE GROUT for filling tile joints up to 12mm wide.  TAL STAIN FREE GROUT is especially designed to drastically reduce the   staining of highly porous tiles such as sandstone and slate, overcoming the “picture-frame” effect encountered with conventional grouts.
  • ‘Wet’ Areas, ie Splashbacks:
    • Option 1:  TAL Quarrygrout
      • Use grey or coloured  TAL QUARRYGROUT mixed 20kg with 5 litres of  TAL BOND (replacing the water in the mix) for filling tile joints 5mm and wider.  TAL QUARRYGROUT is suitable for use in joints up to 25mm wide. 
        Alternatively,  TAL BOND POWDER may be added to the grout mixing water, at a ratio of 1 x 1kg sachet per 20kg TAL QUARRYGROUT.
    • Option 2:  TAL STAIN FREE GROUT 
      • Use Light Grey  TAL STAIN FREE GROUT  mixed 20kg with 6 litres of  TAL BOND  (replacing the water in the mix) for filling tile joints up to 12mm wide  TAL STAIN FREE GROUT is especially designed to drastically reduce the staining of highly porous tiles such as sandstone and slate, overcoming the  “picture-frame” effect encountered with conventional grouts.
        Alternatively,  TAL BOND POWDER may be added to the grout mixing water, at a ratio of 1 x 1kg sachet per 20kg TAL STAIN FREE GROUT.
  • General / WARNING:
    • Particular care must be taken to clean the grout off the tile face before it hardens completely. This is especially important when an additive such as  TAL BOND or  TAL BOND POWDER has been used.
    • A sample of the tiles to be used should be tested beforehand to ensure that no grout is absorbed into the tile body, causing permanent staining of the tiles.
    • It is important to use the stipulated amount of liquid in the TAL Grout mixture. When cleaning, a  damp, not wet,sponge must be used. Over hydration (too much water) of the mix, or in cleaning, causes colour variations in the grout joints, and also affects the integrity of the grout, resulting in a friable product.

 

• MOVEMENT JOINTS
  • It should be noted that the lack of movement joints in a tile panel is a major cause of tile failure. They should be specified at the design stage to avoid placing them in heavy traffic areas and spoiling the visual effect of the tiles
  • Movement joints should be located in both directions at maximum 5 metre centres for interior wall applications.
  • Movement joints should also be located in all horizontal and vertical corners, against obstructions fixed to the structural background and over all discontinuities in building materials, e.g. at interfaces of concrete and brickwork. In addition, movement joints should be located around any fixtures protruding through the tiled surface.
  • The joints should be at least 5mm wide and extend through the adhesive and tile layers. All construction / cold joints and structural joints in the background must be extended through the adhesive and tile layers to the surface in the form of tile panel movement joints. With regards to structural joints, the full width of the structural joints must be respected and extended through the adhesive and tile layers to the surface.
  • Where practical, the bulk of the depth of the movement joint can be filled with TAL SEALMASTER CORD.
  • Seal the joint using  TAL GOLDSTAR SEALMASTER 1000 polyurethane joint sealant in accordance with the manufacturer’s instructions. It is important that the joint sealant bonds only to the sides of the movement joint.
  • For the key requirements common to all tiling situations please refer to SANS 10107-2011, Code of Practice for the Design and Installation of Ceramic Tiling.

 

GENERAL SPECIFICATION FOR FIXING NATURAL STONE TILES ONTO INTERIOR SURFACE BEDS AND SUSPENDED SLABS

 

• BACKGROUND PREPERATION
  • Allow all new concrete work and screeds to cure for at least 6 weeks and 4 weeks respectively before proceeding. All new concrete work and screeds must have a moisture content of 5% or less before tiling can be commenced. When tiling directly onto concrete, ensure that the surfaces are clean and free of all traces of curing agents, laitance and any other surface contaminants, preferably by scarifying.
  • Any screeding must be firmly attached to the underlying concrete, must be integrally sound (no crumbling, cracking, etc) and must be of a quality and consistency suitable for tiling. All damaged, defective, deteriorated or hollow sounding areas must be removed and the floor made good before proceeding. The surface must be clean and dry and free of all traces of dust, debris, loose particles and surface contaminants.
  • If the surface has been woodfloated (rough) it is possible to commence tiling. However, if the surface has been powerfloated or steelfloated (smooth, dense) it will be necessary to first key the surface with a slurry consisting of 1 part  TAL KEYCOAT to 2 parts  TAL KEYMIX powder or 2 parts  TAL GOLDSTAR 6 or  12 powder (by volume), which is applied by block brush.  Allow this slurry coat to dry for 4 – 6 hours before applying the adhesive. * 

 

 

 

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