How To Category: Tiling to Floors

Tiling to flooring/paving grade asphalt

PREPARATION
The asphalt base should be laid in accordance with section four of CP 204: Part 2: 1970 or CP 144: Part 4 and be either flooring or paving grade. It should be noted that roofing grade asphalt/roofing felt is not suitable to receive a tiled finish without overboarding with Norcros Pro Board laid into a bed of Norcros Ultim8 B+ (refer to the ‘How To’ sheet for tiling to bitumen surfaces).
The asphalt must be laid onto a rigid base, i.e. concrete/cement: sand screed, and have adequate cohesive strength. It must be in suitable condition to receive a tiled finish and be thoroughly clean, dry and free from any contamination. Prime with undiluted Norcros Prime Bond and allow to dry before fixing tiles, or levelling where necessary with either Norcros Pro 10, Pro 10+, Pro 30 or Pro 50 in internal areas and Norcros Pro 50 in external areas.

Prime BondPro 10 Levelling CompoundPro 10+ Levelling CompoundPro 30 Levelling CompoundPro 50 Levelling Compound

SETTING OUT
The general rule is to work from the centre outwards. Measure the width and length of the floor and draw a cross in the centre. From the central cross lay out the dry tiles allowing a minimum 3mm wide gap between the tiles to allow for movement stresses within the floor during service. These gaps will be filled with grout once the tiles have been fixed and the adhesive dried. Make sure there are no awkward cuts, some adjustment may be necessary. Always be aware of how the floor will look when you enter the room.
To counteract movement stresses, which can result in tiles cracking and/or debonding, in accordance with British Standard BS5385-3:2014, movement joints should be provided:
a. Over existing and/or structural movement joints
b. Perimeter movement joints should be inserted at door thresholds and where the tiling abuts restraining surfaces such as perimeter walls, columns, curbs, steps and plant fixed to the base
c. In large floor areas, intermediate movement joints should be provided at 8-10 metre intervals.
More information on the provision of movement joints is available in the Norcros ‘How To’ Sheet on ‘Movement Joints in Tiled Installations’.

CUTTING TILES
Floor tiles, especially natural stone and porcelain 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
Fix tiles in a polymer modified cement-based adhesive such as Norcros Rapid Porcelain Grey or White, or Norcros Thick Bed Stone & Porcelain or Norcros Rapid Porcelain S1 Adhesive. Refer to the packaging or product data sheets for information regarding mixing ratios. Stir until a smooth lump-free consistency is achieved. Mix only enough material that can be used within the pot life of the product (around 30 minutes at 20oC). N.B. This will be extended in cold weather and reduced in warm conditions.

Rapid Porcelain Tile AdhesiveRapid Porcelain and Stone AdhesiveThick Bed Porcelain and Stone AdhesiveRapid Porcelain and Stone S1 Tile AdhesiveRapid Porcelain S1 Tile Adhesive

APPLICATION
Using a suitable notched floor trowel held at a 45o angle, spread the adhesive onto the floor 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 3-4mm solid 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. Every so often lift a tile to check that it is in full contact with the adhesive and that no voids are left in the adhesive bed. 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.
DO NOT WALK ON THE TILES FOR AT LEAST 2-3 HOURS, or until the adhesive has set.

GROUTING
Allow the adhesive to dry.
Use either Norcros Flexible Wide Joint Floor & Wall Tile Grout or Norcros 4 into 1 Grout. Clean out any dust, dirt and adhesive from between the tiles and make sure that the joints are dry.

Approximately 4-5 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.
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 a risk of any staining, the tiles should be fully sealed using a proprietary sealer before grouting begins.

Tiling to floating chipboard floors

DESCRIPTION
Floating timber floors are generally constructed of either a concrete or timber base or “raft” onto which a dense polystyrene is bonded (approximately 50mm thick). Tongue & groove timber boards, generally flooring grade chipboard are loose laid on top of the insulation to provide a base to receive floor coverings/finishes. Heating pipes may be bedded in the insulation layer.

The stability/rigidity of the floor is dependent upon:
• The concrete/timber base beneath the insulation layer being flat.
• The insulation layer being high density and therefore having little compression/deformation.
• The tongue & groove boards should be glued together using a good quality wood glue.

N.B. Chipboard with a wax coating is not suitable as a tiling substrate.

If the structure is considered to be sufficiently free from deflection, the floor will be deemed suitable to receive a tiled finish. To check the rigidity of the floor, a glass tumbler should be filled to the rim with water and placed in the centre of the floor. Standing approximately 1 metre away from the tumbler, jump up and down on the floor. If the water spills out of the glass then the floor would require strengthening.
N.B. It should be noted however that in some installations, even when strengthened with an overlay or an anti-fracture/decoupling membrane, a floating floor may still not be able to support the additional weight of tiling without excessive deflection.

PREPARATION
All board edges should be glued. The board should ideally be a minimum 22mm thick.
To avoid shrinkage defects in new boards, the moisture content of the timber must match that of the finished installation before it is fixed (pre-conditioning). When received on site, the boards should be unpacked and loosely stacked, preferably with spacing stickers between the pieces to allow air to circulate around the timber. Store length ways, placing heavy weights on top of the timber stack to restrict warping of the boards. The length of time that the timber should be pre-conditioned will vary depending upon how closely the timber matches site conditions. If conditioning for more than two or three days is required, it is wise to re-stack the timber, moving material from inside the stack to the outside. Conditioning for 14 days or more may be necessary.

In areas which may be subject to wetting, chipboard must be tanked using Norcros Wet Seal Tanking Membrane.

Either:
1. Overlay the chipboard with 10mm Norcros Pro Board which may be either laid into a bed of Norcros Rapid Porcelain Grey adhesive or mechanically fixed with suitable zinc or galvanised screw fixings and galvanised 35mm washers under the screw heads at a rate of 12 fixings per board. (Refer to Pro Board product data sheet)
Or
2. Lay Norcros Permalayer anti-fracture membrane in a 2mm bed of Norcros Rapid Porcelain Grey adhesive and allow to dry. (refer to Permalayer product data sheet)

SETTING OUT
The general rule is to work from the centre outwards. Measure the width and length of the floor and draw a cross in the centre. From the central cross lay out the dry tiles allowing a 3mm wide gap between the tiles to allow for movement stresses within the floor during service. These gaps will be filled with grout once the tiles have been fixed and the adhesive dried. Make sure there are no awkward cuts, some adjustment may be necessary. Always be aware of how the floor will look when you enter the room.
To counteract movement stresses, which can result in tiles cracking and/or debonding, in accordance with British Standard BS5385-3:2014, movement joints should be provided:
a. Over existing and/or structural movement joints
b. Perimeter movement joints should be inserted at door thresholds and where the tiling abuts restraining surfaces such as perimeter walls, columns, curbs, steps and plant fixed to the base
c. In larger internal floor areas, intermediate movement joints should be provided to form bays of a size no greater than 10m x 10m
d. In larger external floor areas, intermediate movement joints should be provided to form bays of size less than 10m x 10m
e. On suspended floors, stress relieving joints should be inserted where flexing is likely to occur, e.g. over supporting walls or beams.
f. Internal floors, which might be subjected to significant thermal changes, i.e. direct sunlight in atria, or underfloor heating etc, the floor area should be divided up by intermediate movement joints provided at 5m intervals in both horizontal directions to provide 25mbays. N.B. These bay sizes may be increased to 40m2 when Norcros Permalayer anti-fracture matting is used.

CUTTING TILES
Floor tiles, especially natural stone and porcelain 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
Fix tiles in a highly polymer modified adhesive such as Norcros Rapid Porcelain Tile Adhesive Grey, Norcros Rapid Porcelain & Stone Adhesive White, Norcros Rapid Porcelain S1 or Norcros Thick Bed Stone & Porcelain, Norcros Rapid Porcelain S1 adhesive for large format tiles.
N.B. Before grouting commences trial a small inconspicuous area to check that the grout does not stain the tiles. If there is a risk of any staining, the tiles should be fully sealed using a proprietary sealer before grouting begins.

Rapid Porcelain Tile AdhesiveRapid Porcelain and Stone AdhesiveRapid Porcelain and Stone S1 Tile AdhesiveRapid Porcelain S1 Tile AdhesiveThick Bed Porcelain and Stone Adhesive

APPLICATION
Using a suitable notched floor trowel held at a 45o angle, spread the adhesive onto the floor 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 3-4mm solid 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. Every so often lift a tile to check that it is in full contact with the adhesive and that no voids are left in the adhesive bed. 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.
DO NOT WALK ON THE TILES FOR AT LEAST 2-3 HOURS, or until the adhesive has set.

GROUTING
Allow the adhesive to dry.
Use either Norcros Flexible Wide Joint Floor & Wall Tile Grout or Norcros 4 into 1 Grout. Clean out any dust, dirt and adhesive from between the tiles and make sure that the joints are dry.

Approximately 4-5 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.

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.

Flexible Wide Joint Tile Grout4 into 1 Wall and Floor Tile Grout

Tiling to existing vinyl floor coverings

PREPARATION
The existing vinyl must be in good condition, clean and dry. N.B. cushion floor coverings are not suitable to receive a ceramic tile finish and must be removed (When fixing onto vinyl adhesive residues refer to the Norcros How To sheet for ‘Fixing to Bitumen Surfaces’.) Clean and degrease the vinyl. Any loose tiles should be removed, together with any adhesive residues, dirt and dust etc. Make good the area.

Standard Domestic Vinyl Tiles & Coverings
Brush apply a neat coat of Norcros Prime Bond to the existing vinyl and allow to dry.

Heavy Duty/Commercial Vinyls
Brush apply a a slurry bonding coat consisting of 2 parts of cement-based adhesive to 1 part Norcros Prime Bond to the existing vinyl & allow to dry.

SETTING OUT
The general rule is to work from the centre outwards. Measure the width and length of the floor and draw a cross in the centre. From the central cross lay out the dry tiles allowing a 3mm wide gap between the tiles to allow for movement stresses within the floor during service. These gaps will be filled with grout once the tiles have been fixed and the adhesive dried. Make sure there are no awkward cuts, some adjustment may be necessary. Always be aware of how the floor will look when you enter the room.

To counteract movement stresses, which can result in tiles cracking and/or debonding. A movement joint should be provided around the perimeter of the room. A gap no less than 6mm wide and 6mm deep or the depth of the tile should be left at the junction between the walls and the floor. This should be filled with silicone sealant at the end of the job, or if being covered with skirting boards or kitchen units etc. may be left open. In large floor areas, intermediate movement joints should be provided at 8 to 10 metre intervals in both directions.

FIXING
Fix tiles in a polymer modified cement-based adhesive such as Norcros Rapid Porcelain Tile Adhesive Grey, Norcros Rapid Porcelain & Stone Adhesive White, Norcros Rapid Porcelain S1 or Norcros Thick Bed Stone & Porcelain Adhesive. Mix as per the instructions on the bag.

Rapid Porcelain Tile AdhesiveRapid Porcelain and Stone AdhesiveRapid Porcelain and Stone S1 Tile AdhesiveRapid Porcelain S1 Tile AdhesiveThick Bed Porcelain and Stone Adhesive

APPLICATION
Using a suitable notched floor trowel held at a 45o angle, spread the adhesive onto the floor 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 3-4mm solid 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 pro-files may need to back buttered. Every so often lift a tile to check that it is in full contact with the adhesive and that no voids are left in the adhesive bed. 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. DO NOT WALK ON THE TILES FOR AT LEAST 2-3 HOURS, or until the adhesive has set.

CUTTING TILES
Floor tiles, especially natural stone and porcelain 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
Allow the adhesive to dry.
Use either Norcros Floor & Wall Tile Grout, Norcros Flexible Floor & Wall Tile Grout or Norcros 4 into 1 Grout. Clean out any dust, dirt and adhesive from between the tiles and make sure that the joints are dry.

Approximately 4-5 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.

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 floor 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 using one of the Norcros levelling compounds such as Pro 10+, Pro 30 Eco or Pro 50.

Pro 10+ Levelling CompoundPro 30 Levelling CompoundPro 50 Levelling Compound

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 Bond should 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).

SETTING OUT
The general rule is to work from the centre outwards. Measure the width and length of the floor and draw a cross in the centre. From the central cross lay out the dry tiles allowing a 3mm wide gap between the tiles to allow for movement stresses within the floor during service. These gaps will be filled with grout once the tiles have been fixed and the adhesive dried. Make sure there are no awkward cuts, some adjustment may be necessary. Always be aware of how the floor will look when you enter the room.

To counteract movement stresses, which can result in tiles cracking and/or debonding. A movement joint should be provided around the perimeter of the room. A gap no less than 6mm wide and 6mm deep or the depth of the tile should be left at the junction between the walls and the floor. This should be filled with silicone sealant at the end of the job, or if being covered with skirting boards or kitchen units etc. may be left open. In large floor areas, intermediate movement joints should be provided at 8 to 10 metre intervals in both directions.

FIXING
Fix tiles in a polymer modified cement-based adhesive such as Norcros Rapid Porcelain Tile Adhesive Grey, Norcros Rapid Porcelain & Stone Adhesive White, Norcros Rapid Porcelain S1 or Norcros Thick Bed Stone & Porcelain Adhesive.
Gradually add 3.5 parts of adhesive powder to 1 part of clean cold water and stir until a smooth lump free consistency is achieved. Mix only enough material that
can be used within the pot life of the product (around 30 minutes at 20oC).

Rapid Porcelain Tile AdhesiveRapid Porcelain and Stone AdhesiveRapid Porcelain and Stone S1 Tile AdhesiveRapid Porcelain S1 Tile AdhesiveThick Bed Porcelain and Stone Adhesive

APPLICATION
Using a suitable notched floor trowel held at a 45o angle, spread the adhesive onto the floor 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 3-4mm solid 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. Every so often lift a tile to check that it is in full contact with the adhesive and that no voids are left in the adhesive bed. 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. DO NOT WALK ON THE TILES FOR AT LEAST 2-3 HOURS, or until the adhesive has set.

CUTTING TILES
Floor tiles, especially natural stone and porcelain 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
Allow the adhesive to dry.
Use either Norcros Floor & Wall Tile Grout, Norcros Flexible Floor & Wall Tile Grout or Norcros 4 into 1 Grout. Clean out any dust, dirt and adhesive from between the tiles and make sure that the joints are dry.

Approximately 4-5 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.

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 concrete / screed floors incorporating underfloor heating systems

DESCRIPTION
A reinforced cement: sand screed generally 65mm to 75mm thick incorporating hot water pipes.

PREPARATION
Minimum drying times for new concrete/ sand: cement screeds before installation of heating/ tiles are:
Concrete = minimum 6 weeks
Sand: cement screed = minimum 3 weeks

Once dried the heating should be switched on and the temperature raised at a rate of 5oC per day to operating temperature. The operating temperature should then be maintained for 2-3 days before cooling down to room temperature, i.e. above 15oC and below 20oC. This is to ensure any movement in the screed has taken place prior to the the tiles being fixed. On completion of tiling, the heating should be allowed to cool completely and should not be switched on for a minimum of 14 days to allow the adhesive & grout to fully cure. After this time, the heating should be switched on at a rate of 5oC per day to operating temperature.

N.B. It is essential to ensure that the tiles selected are suitable for use on heated floors.

Remove all traces of dust/ dirt/ laitance and prime with Norcros Prime Bond diluted 1: 4 with water. To protect the tiles from thermal movement stresses, Norcros Permalayer anti-fracture membrane may be laid in a 2mm bed of Norcros Rapid Porcelain Grey adhesive. Allow to dry.

OPERATING TEMPERATURES
Guidance on the design of underfloor heating is set out in BS EN 1264 Water based surface embedded heating and cooling systems. The maximum surfaces temperatures for ceramic/porcelain tiles laid onto heated concrete/screeds are:

AREA MAXIMUM FLOOR SURFACE TEMPERATURE oC DESIGN ROOM TEMPERATURE
oC
HEAT EMISSION W/m2
Occupied Area 29 20 100
Peripheral Area 35 20 175
Bathroom or similar 33 24 100

SETTING OUT
The general rule is to work from the centre outwards. Measure the width and length of the floor and draw a cross in the centre. From the central cross lay out the dry tiles allowing a minimum 3mm wide gap between the tiles to allow for movement stresses within the floor during service. These gaps will be filled with grout once the tiles have been fixed and the adhesive dried. Make sure there are no awkward cuts, some adjustment may be necessary. Always be aware of how the floor will look when you enter the room.
To counteract movement stresses, which can result in tiles cracking and/or debonding, in accordance with British Standard BS5385-3:2014, movement joints should be provided:
a. Over existing and/or structural movement joints
b. Perimeter movement joints should be inserted at door thresholds and where the tiling abuts restraining surfaces such as perimeter walls, columns, curbs, steps and plant fixed to the base
c. Internal floors, which might be subjected to significant thermal changes, i.e. direct sunlight in atria, or underfloor heating etc., the floor area should be divided up by intermediate movement joints provided at 5m intervals in both horizontal directions to provide 25m2 bays. N.B. These bay sizes may be increased to 40m2 with a maximum bay length of 8m when Norcros Permalayer anti-fracture matting is used.

CUTTING TILES
Floor tiles, especially natural stone and porcelain 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
Fix tiles in a highly polymer modified adhesive such as Norcros Rapid Porcelain Tile Adhesive Grey, Norcros Rapid Porcelain & Stone Adhesive White, Norcros Rapid Porcelain S1 adhesives, or Norcros Thick Bed Stone & Porcelain Grey/White or Norcros Rapid Porcelain S1 adhesive for large format tiles.

N.B. Before grouting commences trial a small inconspicuous area to check that the grout does not stain the tiles. If there is a risk of any staining, the tiles should be fully sealed using a proprietary sealer before grouting begins.

APPLICATION
Using a suitable notched floor trowel held at a 45o angle, spread the adhesive onto the floor 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 3-4mm solid 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. Every so often lift a tile to check that it is in full contact with the adhesive and that no voids are left in the adhesive bed. 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.
DO NOT WALK ON THE TILES FOR AT LEAST 2-3 HOURS, or until the adhesive has set.

GROUTING
Allow the adhesive to dry.
Use either Norcros Flexible Wide Joint Floor & Wall Tile Grout or Norcros 4 into 1 Grout. Clean out any dust, dirt and adhesive from between the tiles and make sure that the joints are dry.

Approximately 4-5 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.

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.

Prime BondRapid Porcelain Tile AdhesiveRapid Porcelain and Stone AdhesiveRapid Porcelain and Stone S1 Tile AdhesiveThick Bed Porcelain and Stone AdhesiveRapid Porcelain S1 Tile AdhesiveFlexible Wide Joint Tile Grout4 Into 1 Wall and Floor Tile Grout

How To Tile Onto A Concrete Floor

PREPARATION
Concrete must be at least 6 weeks old to enable movement caused by drying shrinkage to have taken place. The concrete must be clean, dry and free from dust, laitance and any other contaminants which may act as a release agent, preventing the adhesive from bonding to the concrete. If the concrete is dusty, dry brush with a wire brush and remove the loose dust. Brush apply Norcros Prime Bond diluted 1:4 with water, to reduce the absorbency of the concrete and suppress dust. The concrete may be levelled using either Norcros Pro 50 or Norcros Pro 30 levelling compound.

Pro 30 Levelling CompoundPro 50 Levelling CompoundPrime Bond

Power Floated Concrete has a shiny finish which inhibits adhesion, for this reason it
should be prepared by either:
1. Mechanically abrading to expose the coarse aggregate.
OR
2. Removing all traces of dirt, dust etc. prior to applying a slurry bonding coat consisting of 2 parts cement-based adhesive: 1 part Norcros Prime Bond using a brush or roller. The slurry bonding coat should be allowed to dry before fixing commences.

SETTING OUT
The general rule is to work from the centre outwards. Measure the width and length of the floor and draw a cross in the centre. From the central cross lay out the dry tiles allowing a minimum 3mm wide gap between the tiles to allow for movement stresses within the floor during service. These gaps will be filled with grout once the tiles have been fixed and the adhesive dried. Make sure there are no awkward cuts, some adjustment may be necessary. Always be aware of how the floor will look when you enter the room.
To counteract movement stresses, which can result in tiles cracking and/or debonding, in accordance with British Standard BS5385-3:2014, movement joints should be provided:
a. Over existing and/or structural movement joints.
b. Perimeter movement joints should be inserted at door thresholds and where the tiling abuts restraining surfaces such as perimeter walls, columns, curbs, steps and plant fixed to the base
c. In large floor areas, intermediate movement joints should be provided at 8-10 metre intervals.
More information on the provision of movement joints is available in the Norcros ‘How To’ Sheet for ‘Movement Joints in Tiled Installations’.

CUTTING TILES
Floor tiles, especially natural stone and porcelain 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
Fix tiles in a cement-based adhesive such as Norcros Fast Set Rock-Tite, Norcros Rapid Porcelain Grey or White, Norcros Rapid Porcelain S1 or Norcros Thick Bed Stone & Porcelain Adhesive. Refer to the packaging or product data sheets for information regarding mixing ratios. Stir until a smooth lump-free consistency is achieved. Mix only enough material that can be used within the pot life of the product (around 30 minutes at 20oC). N.B. This will be extended in cold weather and reduced in warm conditions.

APPLICATION
Using a suitable notched floor trowel held at a 45o angle, spread the adhesive onto the floor 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 3-4mm solid 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. Every so often lift a tile to check that it is in full contact with the adhesive and that no voids are left in the adhesive bed. 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.
DO NOT WALK ON THE TILES FOR AT LEAST 2-3 HOURS, or until the adhesive has set.

GROUTING
Allow the adhesive to dry.
Use either Norcros Flexible Wide Joint Floor & Wall Tile Grout or Norcros 4 into 1 Grout. Clean out any dust, dirt and adhesive from between the tiles and make sure that the joints are dry.

Flexible Wide Joint Tile Grout4 Into 1 Wall and Floor Tile GroutApproximately 4-5 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. 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 a risk of any staining, the tiles should be fully sealed using a proprietary sealer before grouting begins.