How To Category: Walls

Tiling to cement: sand render walls

PREPARATION
The render must be a minimum of 2 weeks old to enable movement caused by drying shrinkage to have taken place. It must be clean, dry and free from dust, laitance or any other contaminants which may act as a release agent, preventing the adhesive from bonding to the render.

If the render is dusty it should be thoroughly dry brushed with a stiff bristled brush and the dust removed from the surface prior to priming with Norcros Prime Bond diluted 1: 4 with water. Allow to dryPrime Bond

SETTING OUT
Tiling should be set out from the centre of the walls, either the centre of a tile or the joint between two tiles positioned in the centre of the wall, whichever of these two options avoids small cuts of the tiles. Make a gauge rod using a length of straight timber. Along the length of the timber mark out the width of the tiles, leaving a gap at least 2mm wide between each tile. Set out the horizontal position of the tiles so that the same size cuts are made at either side of windows etc. avoiding any small cuts. At the lowest point of the wall to which tiles are being fixed, such as the skirting board, work surface etc. place an uncut tile and draw a line along the top of the tile. Nail a batten below this line, using a spirit level to make sure that it is level. The first line of tiles will rest on this batten. Measure the width of the wall and mark the centre point. Draw a vertical line at this centre point using a spirit level to make sure that the line is straight. Start tiling at the centre point.

To counteract movement stresses, which can result in tiles cracking and/or debonding, in accordance with British Standard BS5385-1:2009, movement joints should be provided:
• over existing and/or structural movement joints
• where tiling abuts other materials and at junctions between different substrates
• at vertical corners
• at 3m to 4.5m centres both horizontally and vertically and in areas where stresses are likely to be concentrated such as at changes of alignment.
• An increase in the frequency of movement joints should be considered if large degrees of thermal movement or vibration are expected within an installation.
More information on the provision of movement joints is available in the Norcros How to Sheet ‘Movement Joints in Tiled Installations’.

CUTTING TILES
Some porcelain & natural stone tiles can be difficult to cut and good quality tools are required. These can bought or in some instances hired. A slide cutter and nippers are essential, however an electric wet cutter will make the job easier. For intricate cuts a cardboard template will help to achieve more accurate results.

FIXING
Tiles should be fixed in Norcros One Part Flexible Tile adhesive or Norcros Standard Set Flexible S1 adhesive. Norcros Rapid Porcelain Tile or Rapid Porcelain S1 adhesive may be used if a rapid setting adhesive is preferred. Mix the adhesive in accordance with the mixing instructions on the bag.
One Part Flexible AdhesiveOne Part Flexible AdhesiveRapid Porcelain and Stone S1 Tile AdhesiveRapid Porcelain Tile AdhesiveRapid Porcelain and Stone AdhesiveRapid Porcelain and Stone S1 Tile AdhesiveRapid Porcelain S1 Tile Adhesive

APPLICATION
Using a suitable notched wall trowel held at a 45o angle, spread the adhesive onto the wall to form parallel ribs into which the tiles should be pushed with a firm twisting action, this will collapse the ribs of adhesive and produce a 2-3mm bed of adhesive beneath the tiles. Work in small areas and discard any adhesive that begins to dry or ‘skin over’. Tiles with deeply keyed back profiles may need to back buttered. In areas subject to wetting such as showers, it is essential that a solid bed of adhesive is achieved beneath the tiles. Wipe off any adhesive residues from the surface of the tiles using a damp sponge before the adhesive sets. Remove deposits of adhesive which may build up in the gaps between the tiles.

GROUTING
Allow the adhesive to dry.
Use Norcros Wall Tile Grout. In areas subject to wetting or where movement/vibration is antic-ipated Norcros Stop Mould Grout, Norcros 4 into 1 Grout or Norcros Super Epoxy may be used.
Clean out any dust, dirt and adhesive from between the tiles and make sure that the joints are dry.
Mix the grout in accordance with the recommendations on the packaging.
Holding a soft rubber grout float at 45o, sweep the mixed grout diagonally across the tiles, ensuring that the grout is pushed fully into the joints. Clean off as much grout from the surface of the tiles as possible and allow the grout to become touch dry. Clean off the grout residues with a damp sponge wiped diagonally across the tiles. Allow the tiles to dry and buff the surface with a dry cloth. Any stubborn residues may be cleaned off with washing up detergent mixed with warm water within 24 hours of grouting.
N.B. Before grouting commences trial a small inconspicuous area to check that the grout does not stain the tiles. If there is any risk of staining, the tiles should be fully sealed using a proprietary sealer before grouting begins.

Tiling to plasterboard walls

PREPARATION
Plasterboard should be dry, securely fixed and rigid with no protruding fixings with the face to receive decorative finishes exposed. It should be a minimum 12.5mm thick when fixed to timber framing or battening and fixed in accordance with the manufacturers recommendations.

The maximum weight of tiling which plasterboard is able to support is 32kg/m2, generally equivalent to a ceramic tile with a maximum thickness of 12.5mm or natural stone with a maximum thickness of 10mm.

SETTING OUT
Tiling should be set out from the centre of the walls, either the centre of a tile or the joint between two tiles positioned in the centre of the wall, whichever of these two options avoids small cuts of the tiles. Make a gauge rod using a length of straight timber. Along the length of the timber mark out the width of the tiles, leaving a gap at least 2mm wide between each tile. Set out the horizontal position of the tiles so that the same size cuts are made at either side of windows etc. avoiding any small cuts. At the lowest point of the wall to which tiles are being fixed, such as the skirting board, work surface etc. place an uncut tile and draw a line along the top of the tile. Nail a batten below this line, using a spirit level to make sure that it is level. The first line of tiles will rest on this batten. Measure the width of the wall and mark the centre point. Draw a vertical line at this centre point using a spirit level to make sure that the line is straight. Start tiling at the centre point.

To counteract movement stresses, which can result in tiles cracking and/or debonding, in accordance with British Standard BS5385-1:2009, movement joints should be provided:

  • over existing and/or structural movement joints
  • where tiling abuts other materials and at junctions between different substrates
  • at vertical corners
  • at 3m to 4.5m centres both horizontally and vertically and in areas where stresses are likely to be concentrated such as at changes of alignment.
  • An increase in the frequency of movement joints should be considered if large degrees of thermal movement or vibration are expected within an installation.

More information on the provision of movement joints is available in the Norcros How to Sheet ‘Movement Joints in Tiled Installations’.

CUTTING TILES
Some porcelain & natural stone tiles can be difficult to cut and good quality tools are required. These can bought or in some instances hired. A slide cutter and nippers are essential, however an electric wet cutter will make the job easier. For intricate cuts a cardboard template will help to achieve more accurate results.

FIXING
In dry areas, or those which will be subjected to light intermittent wetting, i.e. bathrooms and standard domestic showers, ceramic porous body tiles up to 400mm x 300mm or porcelain tiles up to 200mm x 200mm may be fixed using Norcros Ultim8 adhesive. In areas which will be subject to wetting, i.e. power showers, heavy duty showers the plasterboard should be tanked using Norcros Wet Seal Tanking Membrane prior to fixing tiles in a 3mm solid bed of Norcros Ultim8+ adhesive. If larger tiles are to be used, they should be fixed using Norcros One Part Flexible White or Norcros Standard Set Flexible S1 adhesive.

One Part Flexible AdhesiveWet SealUltim8Ultim8+

APPLICATION
Using a suitable notched wall trowel held at a 45o angle, spread the adhesive onto the wall to form parallel ribs into which the tiles should be pushed with a firm twisting action, his will collapse the ribs of adhesive and produce a 2-3mm bed of adhesive beneath the tiles. Work in small areas and discard any adhesive that begins to dry or ‘skin over’. Tiles with deeply keyed back profiles may need to back buttered. In areas subject to wetting such as showers, it is essential that a solid bed of adhesive is achieved beneath the tiles. Wipe off any adhesive residues from the surface of the tiles using a damp sponge before the adhesive sets. Remove deposits of adhesive which may build up in the gaps between the tiles.

GROUTING
Allow the adhesive to dry.
Use Norcros Wall Tile Grout. In areas subject to wetting or where movement/vibration is anticipated Norcros Stop Mould Grout, Norcros 4 into 1 Grout or Norcros Super Epoxy may be used.
Clean out any dust, dirt and adhesive from between the tiles and make sure that the joints are dry.
Mix the grout in accordance with the recommendations on the packaging.
Holding a soft rubber grout float at 45o, sweep the mixed grout diagonally across the tiles, ensuring that the grout is pushed fully into the joints. Clean off as much grout from the surface of the tiles as possible and allow the grout to become touch dry. Clean off the grout residues with a damp sponge wiped diagonally across the tiles. Allow the tiles to dry and buff the surface with a dry cloth. Any stubborn residues may be cleaned off with washing up detergent mixed with warm water within 24 hours of grouting.
N.B. Before grouting commences trial a small inconspicuous area to check that the grout does not stain the tiles. If there is any risk of staining, the tiles should be fully sealed using a proprietary sealer before grouting begins.

Wall Tile GroutStop Mould Flexible Wall Tile Grout4 Into 1 Wall and Floor Tile GroutSuper Epoxy

Tiling to plaster walls

PREPARATION
Plaster must be fully dry before tiling commences. Minimum drying times are:

  • 4 weeks for backing coat + skim coat
  • 1 week for skim coat only

Prime Bond The plaster must be in good condition and firmly bonded to the background with no hollow-sounding areas. It should be noted that backing plaster is not sufficiently strong to accept a tiled finish. Tiles should only ever be fixed to the finishing coat. Any loose or hollow areas should be removed and made good.

If the plaster is dusty or has a shiny finish, it should be thoroughly dry brushed with a stiff bristled brush and the dust removed from the surface prior to priming with Norcros Prime Bond diluted 1: 4 with water. Allow to dry

If tiles are being fixed using cement-based adhesives, the plaster should be primed with undiluted Norcros Prime Bond to prevent any reaction occurring between the gypsum plaster and wet cement in the adhesive.

The maximum weight of tiling which plaster is able to support is 20kg/m2, generally equivalent to a ceramic tile with a maximum thickness of 8mm or natural stone with a maximum thickness of 7mm.

SETTING OUT
Tiling should be set out from the centre of the walls, either the centre of a tile or the joint between two tiles positioned in the centre of the wall, whichever of these two options avoids small cuts of the tiles. Make a gauge rod using a length of straight timber. Along the length of the timber mark out the width of the tiles, leaving a gap at least 2mm wide between each tile. Set out the horizontal position of the tiles so that the same size cuts are made at either side of windows etc. avoiding any small cuts. At the lowest point of the wall to which tiles are being fixed, such as the skirting board, work surface etc. place an uncut tile and draw a line along the top of the tile. Nail a batten below this line, using a spirit level to make sure that it is level. The first line of tiles will rest on this batten. Measure the width of the wall and mark the centre point. Draw a vertical line at this centre point using a spirit level to make sure that the line is straight. Start tiling at the centre point.

To counteract movement stresses, which can result in tiles cracking and/or debonding, in accordance with British Standard BS5385-1:2009, movement joints should be provided:

  • over existing and/or structural movement joints
  • where tiling abuts other materials and at junctions between different substrates
  • at vertical corners
  • at 3m to 4.5m centres both horizontally and vertically and in areas where stresses are likely to be concentrated such as at changes of alignment.
  • An increase in the frequency of movement joints should be considered if large degrees of thermal movement or vibration are expected within an installation.

More information on the provision of movement joints is available in the Norcros How to Sheet ‘Movement Joints in Tiled Installations’.

CUTTING TILES
Some porcelain & natural stone tiles can be difficult to cut and good quality tools are required. These can bought or in some in-stances hired. A slide cutter and nippers are essential, however an electric wet cutter will make the job easier. For intricate cuts a cardboard template will help to achieve more accurate results.

FIXING
In dry areas, or those which will be subjected to light intermittent wetting, i.e. bathrooms and standard domestic showers, ceramic porous body tiles up to 400mm x 300mm or porcelain tiles up to 200mm x 200mm may be fixed using Norcros Ultim8 adhesive. In areas which will be subject to wetting, i.e. power showers, heavy duty showers the plaster should be tanked using Norcros Wet Seal Tanking Membrane prior to fixing tiles in a 3mm solid bed of Norcros Ultim8+ adhesive.
If larger tiles are to be used, the plaster should be primed with undiluted Norcros Prime Bond which should be allowed to dry be-fore the tiles are fixed using Norcros One Part Flexible White or Norcros Standard Set Flexible S1 adhesive.

One Part Flexible AdhesiveS1 Tile Adhesive

Wet Seal Tanking MembraneUltim8Ultim8+

APPLICATION
Using a suitable notched wall trowel held at a 45o angle, spread the adhesive onto the wall to form parallel ribs into which the tiles should be pushed with a firm twisting action, this will collapse the ribs of adhesive and produce a 2-3mm bed of adhesive beneath the tiles. Work in small areas and discard any adhesive that begins to dry or ‘skin over’. Tiles with deeply keyed back profiles may need to back buttered. In areas subject to wetting such as showers, it is essential that a solid bed of adhesive is achieved beneath the tiles. Wipe off any adhesive residues from the surface of the tiles using a damp sponge before the adhesive sets. Remove deposits of adhesive which may build up in the gaps between the tiles.

GROUTING
Allow the adhesive to dry.
Use Norcros Wall Tile Grout. In areas subject to wetting or where movement/vibration is anticipated Norcros Stop Mould Grout, Norcros 4 into 1 Grout or Norcros Super Epoxy may be used.
Clean out any dust, dirt and adhesive from between the tiles and make sure that the joints are dry.
Mix the grout in accordance with the recommendations on the packaging.
Holding a soft rubber grout float at 45o, sweep the mixed grout diagonally across the tiles, ensuring that the grout is pushed fully into the joints. Clean off as much grout from the surface of the tiles as possible and allow the grout to become touch dry. Clean off the grout residues with a damp sponge wiped diagonally across the tiles. Allow the tiles to dry and buff the surface with a dry cloth. Any stubborn residues may be cleaned off with washing up detergent mixed with warm water within 24 hours of grouting.
N.B. Before grouting commences trial a small inconspicuous area to check that the grout does not stain the tiles. If there is any risk of staining, the tiles should be fully sealed using a proprietary sealer before grouting begins.

Tiling to lightweight / medium density blockwork walls

DESCRIPTION
Lightweight and medium density blockwork have a compressive strength of less than 7N/mm2 and are suitable to receive a tiled finish in internal, dry installations as long as they are sufficiently flat and fair faced. Externally, in internal areas which may be subject to moisture or in instances where the blockwork is not deemed to be sufficiently flat, it would need to either be over boarded with Norcros Pro Board or would require the application of a cement: sand render coat.Prime Bond

PREPARATION
The blockwork must be a minimum of 6 weeks before either the application of a cement: sand render coat or tiles. It must be clean, dry and free from dust, laitance or any contaminants which may act as a release agent and prevent the adhesive from bonding to the blockwork. Once dry, the clockwork should be primed with Norcros Prime Bond diluted 1: 4 with water which should be allowed to dry.

SETTING OUT
Tiling should be set out from the centre of the walls, either the centre of a tile or the joint between two tiles positioned in the centre of the wall, whichever of these two options avoids small cuts of the tiles. Make a gauge rod using a length of straight timber. Along the length of the timber mark out the width of the tiles, leaving a gap at least 2mm wide between each tile. Set out the horizontal position of the tiles so that the same size cuts are made at either side of windows etc. avoiding any small cuts. At the lowest point of the wall to which tiles are being fixed, such as the skirting board, work surface etc. place an uncut tile and draw a line along the top of the tile. Nail a batten below this line, using a spirit level to make sure that it is level. The first line of tiles will rest on this batten. Measure the width of the wall and mark the centre point. Draw a vertical line at this centre point using a spirit level to make sure that the line is straight. Start tiling at the centre point.

To counteract movement stresses, which can result in tiles cracking and/or debonding, in accordance with British Standard BS5385-1:2009, movement joints should be provided:

  • over existing and/or structural movement joints
  • where tiling abuts other materials and at junctions between different substrates
  • at vertical corners
  • at 3m to 4.5m centres both horizontally and vertically and in areas where stresses are likely to be concentrated such as at changes of alignment.
  • An increase in the frequency of movement joints should be considered if large degrees of thermal movement or vibration are expected within an installation.

More information on the provision of movement joints is available in the Norcros How to Sheet ‘Movement Joints in Tiled Installations’.

CUTTING TILES
Some porcelain & natural stone tiles can be difficult to cut and good quality tools are required. These can bought or in some instances hired. A slide cutter and nippers are essential, however an electric wet cutter will make the job easier. For intricate cuts a cardboard template will help to achieve more accurate results.

FIXING
Tiles should be fixed in Norcros One Part Flexible Tile adhesive or Norcros Standard Set Flexible S1 adhesive. Norcros Rapid Porcelain Tile or Rapid Porcelain S1 adhesive may be used if a rapid setting adhesive is preferred. Mix the adhesive in accordance with the mixing instructions on the bag.
One Part Flexible AdhesiveOne Part Flexible AdhesiveS1 Tile AdhesivePorcelain Tile AdhesivePorcelain and Stone AdhesiveS1 Tile AdhesiveS1 Tile Adhesive

APPLICATION
Using a suitable notched wall trowel held at a 45o angle, spread the adhesive onto the wall to form parallel ribs into which the tiles should be pushed with a firm twisting action, this will collapse the ribs of adhesive and produce a 2-3mm bed of adhesive beneath the tiles. Work in small areas and discard any adhesive that begins to dry or ‘skin over’. Tiles with deeply keyed back profiles may need to back buttered. In areas subject to wetting such as showers, it is essential that a solid bed of adhesive is achieved beneath the tiles. Wipe off any adhesive residues from the surface of the tiles using a damp sponge before the adhesive sets. Remove deposits of adhesive which may build up in the gaps between the tiles.

GROUTING
Allow the adhesive to dry.
Use Norcros Wall Tile Grout. In areas subject to wetting or where movement/vibration is antic-ipated Norcros Stop Mould Grout, Norcros 4 into 1 Grout or Norcros Super Epoxy may be used.
Clean out any dust, dirt and adhesive from between the tiles and make sure that the joints are dry.
Mix the grout in accordance with the recommendations on the packaging.
Holding a soft rubber grout float at 45o, sweep the mixed grout diagonally across the tiles, ensuring that the grout is pushed fully into the joints. Clean off as much grout from the surface of the tiles as possible and allow the grout to become touch dry. Clean off the grout residues with a damp sponge wiped diagonally across the tiles. Allow the tiles to dry and buff the surface with a dry cloth. Any stubborn residues may be cleaned off with washing up detergent mixed with warm water within 24 hours of grouting.
N.B. Before grouting commences trial a small inconspicuous area to check that the grout does not stain the tiles. If there is any risk of staining, the tiles should be fully sealed using a proprietary sealer before grouting begins.

Tiling to existing wall tiles & impervious surfaces

PREPARATION
Check that all surfaces are clean, dry and free from any contamination.
The existing tiles should be degreased and any sealers applied to the tile surface removed as these will act as a release agent and prevent good adhesion. Any loose tiles or voids in the surface should be repaired and made good.
It is essential that the underlying substrate is able to support the additional weight of tiling. Weight limits for substrates are as follows:
Gypsum Plaster = 20kg/m2
Plasterboard = 32kg/m2
Plywood = 30kg/m2
Backer board = 50—85kg/m2 (check with board manufacturer)

SETTING OUT
Tiling should be set out from the centre of the walls, either the centre of a tile in the centre of the wall or the joint between two tiles in the centre of the wall, whichever option will avoid small cuts of the tiles.
Make a gauge rod using a length of straight timber. Along the length of the timber mark out the width of the tiles, leaving a gap at least 2mm wide between each tile. Set out the horizontal position of the tiles so that the same size cuts are made either side of windows etc, avoiding any small cuts.
At the lowest point of the wall to which you are tiling, such as the skirting board, work surface etc, place an uncut tile and draw a line along the top of the tile. Nail a batten below this line, using a spirit level to make sure it is level. The first line of tiles will rest on this batten.
Measure the width of the wall and mark the centre point. Draw a vertical line down at this centre point using a spirit level to make sure that the line is straight. Start tiling at this centre point.

OPTION 1
Porous body wall tiles, not greater than 200mm x 200mm may be fixed with Norcros Ultim8 in dry areas or Ultim8+ in areas which may be subject to wetting. It should be noted that the adhesive will take a minimum of 72 hours to dry before grouting can take place.

OPTION 2 S1 Tile Adhesive One Part Flexible Adhesive
To provide a key onto which the adhesive can bond, a slurry bonding coat consisting of 2 parts of cement-based adhesive to 1 part Norcros Prime Bondshould be applied to the surface of the existing tiles using a suitable brush, making sure that the slurry bonding coat covers the whole area. Allow to dry (approximately 1 hour depending upon temperature and humidity. Tiles may be fixed with Norcros One Part Flexible or Norcros Standard Set Flexible S1 adhesive. Grouting may take place approximately 24 hours after fixing.
Ultim8Ultim8 Plus

APPLICATION
Using a suitable notched wall trowel held at a 45o angle, spread the adhesive onto the wall to form parallel ribs into which the tiles should be pushed with a firm twisting action, this will collapse the ribs of adhesive and produce a 2-3mm bed of adhesive beneath the tiles. Work in small areas and dis-card any adhesive that begins to dry or ‘skin over’. Tiles with deeply keyed back profiles may need to back buttered. In areas subject to wetting such as showers, it is essential that a solid bed of adhesive is achieved beneath the tiles. Wipe off any adhesive residues from the surface of the tiles using a damp sponge before the adhesive sets. Remove deposits of adhesive which may build up in the gaps between the tiles.

CUTTING TILES
Some porcelain tiles can be difficult to cut and good quality tools are required. These can bought or in some instances hired. A slide cutter and nippers are essential, however an electric wet cutter will make the job easier. For intricate cuts a cardboard template will help to achieve more accurate results.

GROUTING Wall Tile Grout
Allow the adhesive to dry.
Use Norcros Wall Tile Grout. In areas subject to wetting or where movement/vibration is anticipated Norcros Stop Mould Grout, Norcros 4 into 1 Grout or Norcros Super Epoxy may be used.

Clean out any dust, dirt and adhesive from between the tiles and make sure that the joints are dry.Stop Mould - Flexible Wall Tile Grout

Approximately 3 parts grout powder should be added to 1 part water, ensuring that the powder is added to the liquid to prevent the product from flash setting. Manually mix the grout to reduce the amount of air incorporated into the mix.

4 into 1 Wall and Floor Tile GroutHolding a soft rubber grout float at 45o, sweep the mixed grout diagonally across the tiles, ensuring that the grout is pushed fully into the joints. Clean off as much grout from the surface of the tiles as possible and allow the grout to become touch dry. Clean off the grout residues with a damp sponge wiped diagonally across the tiles. Allow the tiles to dry and buff the surface with a dry cloth. Any stubborn residues may be cleaned off with washing up detergent mixed with warm water within 24 hours of grouting.
Super Epoxy
N.B. Before grouting commences trial a small inconspicuous area to check that the grout does not stain the tiles. If there is any risk of staining, the tiles should be fully sealed using a proprietary sealer before grouting begins.

Norcros pro board fixing instructions

Fixing to Wooden Floors
By Adhesive Norcros Pro Boards may be laid using Norcros Rapid Porcelain Grey Adhesive – solvent based or ready mixed adhesives MUST NOT be used. Boards should be thoroughly bedded and laid in a chequer plate fashion making sure that there are no air gaps between the boards.

By Mechanical Fixing Norcros Pro Boards can be installed using mechanical fixings to flat and level timber floors using approximately 12 fixings per 1200mm x 600mm board-fix using Norcros 35mm diameter fixing washers and suitable screws.

WHEN USING MECHANICAL FIXINGS MAKE SURE TO AVOID ELECTRICAL CABLES OR PIPEWORK THAT MAY BE CONCEALED UNDER THE FLOOR. THE CORRECT SCREW LENGTH SHOULD BE USED.

Fixing to Concrete Floors
Prior to fixing the Norcros Pro Boards, all traces of loose material should be removed back to the concrete substrate. The floor should be level and dust free. We recommend sealing the floor with a suitable water resistant primer before the boards are laid. New concrete or screed should be correctly cured prior to fixing the boards. The boards can be fixed using Norcros Rapid Porcelain Grey Adhesive – SOLVENT BASED OR READY MIXED ADHESIVES MUST NOT BE USED. Apply a bed of adhesive to the floor using an 8mm square notched tiling trowel. Norcros Pro Boards should be thoroughly bedded into the adhesive and laid in a chequer plate fashion ensuring that no voids remain beneath them. DO NOT ALLOW THE ADHESIVE TO FORM A DRY SKIN PRIOR TO BONDING THE BOARDS. Any slight depressions in the concrete floor will normally be taken up with the thickness of the adhesive.

Expansion/Movement Joints
Norcros Pro Boards must not bridge expansion/movement joints in the subfloor. The integrity of such joints should be maintained through the board and tile bed and should be sealed in the appropriate manner.

Tile choice for Floors
When choosing tiles for your floor it is important to consider point loading. Applying larger tiles improves the board’s resistance to concentrated loads. For areas that may be subject to concentrated loads over 0.15 N/mm² advice should be sought to determine suitability. All tiles must be fixed using a solid bed of adhesive ensuring no voids remain under the tiles. Tiles should be fixed using either Norcros Rapid Porcelain Grey, Norcros Rapid Porcelain & Stone White or Norcros Thick Bed Porcelain & Stone adhesive SOLVENT BASED OR READY MIXED ADHESIVES MUST NOT BE USED. The chart below shows resistance to concentrated loads based on 0.15 N/mm² over a range of standard tile sizes.

Tile size examples

300mm x 200mm

150mm x 150mm

100mm x 100mm

50mm x 50mm

Load resistance over tile surface

900kg

337kg

150kg

37.5kg

Tile Fixing to Floors with Under Floor Heating Cable/Mat
Tiles can be laid directly on top of the under floor heating cable/mats, however care must be taken not to damage the heating cable. We therefore recommend that the heating cables are encapsulated in a bed of either Norcros Pro 50 or Norcros 2 Part Levelling Compound prior to fixing tiles. Tiles may be fixed once the levelling compound has fully cured..

Fixing to Brick/Block Walls
Make sure that the existing wall surface is sound and free of dust and grease. If the wall has a finished plaster surface and is in a good condition, it may be possible to adhere the Norcros Pro Boards without removing the existing plaster, however professional advice on the stability of the wall structure should be sought. Plastered walls MUST be sealed with a neat application of Norcros Prime Bond prior to fixing boards. Norcros Pro Boards should be fixed to walls using Norcros Rapid Porcelain Grey Adhesive. Wherever possible we recommend that the boards are bonded to the wall using a solid bed of adhesive in a similar fashion to fixing tiles. If a Dot and Dab method is preferred, the adhesive dabs must be applied directly to the board. We recommend applying a solid bed of adhesive around the edges of each board with centre dots at a maximum of 300mm centres. To avoid adhesive shrinkage, the adhesive dabs should be no thicker than 30mm. Offer up the board vertically to the wall surface and bed firmly into place. When using a Dot and Dab method we recommend securing the boards using mechanical fasteners (dowels) once the adhesive has set. Mechanical fasteners should be positioned around the perimeter of the boards at a maximum of 600mm centres e.g. for a 2400mm x 600mm board use 5 fasteners down each edge. Tape all joints using either Norcros self-adhesive alkaline resistant tape or Norcros waterproof tape

Fixing to Stud Partition Walls
6mm boards are not suitable for fixing to stud walls. For 10mm and 12.5mm thick boards, vertical studs should be set at *300mm centres. For board thickness of 20mm and above *400mm centres are suitable. All board edges must be supported by timber noggins and fixed using approximately 12 fixings for a 1200mm x 600mm board. Norcros 35mm diameter washers must be used under the head of a steel screw. Screw down until the washer bites into the board. Tape all joints using either Norcros self-adhesive alkaline resistant tape or Norcros waterproof tape (*Stud centres should be set subject to load requirement)

Tile Fixing to Walls
Once the adhesive for securing the boards has hardened and all joints have been taped, tiles can then be fixed directly to the board surface.

Plastering
Prior to skim coating with plaster, the surface of the Norcros Pro Boards should first be sealed using a neat application of Norcros Prime Bond.
Note: Norcros Pro Boards must be stored flat at all times, leaning the boards against a wall can cause them to warp slightly prior to installation. If this occurs they can be straightened by applying a minimal amount of hand pressure. This correction will not affect the performance of the boards. When fixing boards in conditions where the room temperature can fluctuate considerably (e.g. conservatories) it is advisable to control the room temperature allowing the adhesive used to set properly.
All information is given as guidance and if adhered to will perform as intended. We fully guarantee the quality of our boards but as we do not have knowledge of site conditions or the capability of the installer, we cannot accept liability for damage which may arise as a result of installation. Please contact your supplier if you require further information.