How Too version 3

Tiling to Specific Backgrounds

  • How do I tile on to Anhydrite Screeds?

    Answer:

    Before tiling to an anhydrite (or gypsum or calcium sulphate) screed, you must first ensure it is dry. They generally dry at a rate of 1 day per mm of screed thickness for depths up to 40mm, and an additional 2 days per mm for thicknesses thereafter. For example, a 40mm deep screed requires 40 days to dry and a 50mm deep screed requires 60 days. To be sure it is dry, test the screed with a hygrometer meter such as the TRAMEX Hygrohood; readings of 75% RH or lower will mean it’s ready for tiling.

    After confirming it is dry, abrade the surface with suitable mechanised equipment prepare the surface to remove any laitance, loose debris and dust, and reveal the aggregate underneath.

    The anhydrite screed should then be primed with a single coat of ARDEX P 51 diluted 1:3 with water, applied in one continuous coat using a brush or broom. Once the ARDEX P 51 is dry, tile as normal using an appropriate ARDEX Cement-Based Tile Adhesive.


  • How do I tile on to plaster?

    Answer:

    Before tiling to plaster, you must first ensure it is at least 4 weeks old and that the total weight of the tiling will not exceed 20kg/m2, as recommended by BS 5385. You must then wire brush the surface to remove any dust. The plaster should then be primed with a single coat of ARDEX P 51 diluted 1:3 with water and applied with a brush. Once the ARDEX P 51 is dry, tile as normal using an appropriate ARDEX Cement-Based Tile Adhesive.


  • How do I tile on to plywood floors?

    Answer:

    If levelling is not required, prime plywood floors with a single coat of undiluted ARDEX P 51 applied with a brush or broom. Once the ARDEX P 51 is dry, it should then be tiled using an ARDEX RAPIDRY FORMULA adhesive such as ARDEX MICROTEC X 7001, ARDEX MICROTEC S 27 or ARDEX MICROTEC S 28.

    If levelling is required, level over the plywood with ARDITEX NA applied direct (without priming) with a smoothing trowel. It will dry after 3 hours and should then be over sheeted with a suitable mechanically fixed tile backer board, which can then be tiled as normal using an appropriate (as before) ARDEX Cement-Based Tile Adhesive.


  • How do I tile on to plywood walls?

    Answer:

    Tiling to plywood walls is no longer recommended under BS 5385-1:2018. Plywood walls should be over sheeted with tile backer board or plasterboard as appropriate for the intended area, and these can then be tiled as normal using an appropriate ARDEX Cement-Based Tile Adhesive.


  • How do I tile on to existing tiles?

    Answer:

    If levelling is not required, prime existing tiles with a single coat of ARDEX P 4 applied with a short pile roller or paint brush. It will dry after 30-60 minutes, producing a textured-grip surface which can then be tiled as normal using an appropriate ARDEX Cement-Based Tile Adhesive.

    If levelling is required on floors, level over existing tiles with ARDITEX NA applied 3mm+ deep direct (without priming) with a smoothing trowel. It will dry in as little as 3 hours, and can then be tiled as normal using an appropriate ARDEX Cement-Based Tile Adhesive.


  • How do I tile on to bitumen adhesive residues?

    Answer:

    Before tiling to bitumen adhesive residues, they should be levelled with ARDITEX NA applied 3-6mm deep direct (without priming) with a smoothing trowel. It will dry in as little as 3 hours, and can then be tiled as normal using an appropriate ARDEX Cement-Based Tile Adhesive.


  • How do I tile on to uncoupling membranes?

    Answer:

    After installing uncoupling membranes with ARDEX AF 200 PLUS, they can be tiled immediately using an appropriate ARDEX Cement-Based Tile Adhesive.

    Uncoupling membranes with cavities can be pre-filled to produce a flat surface ideal for tiling. For this application, smooth over the uncoupling matting with ARDITEX NA up to the top of the cavities using a smoothing trowel. ARDITEX NA can be applied thicker if additional levelling is required, but along with the subsequent tile adhesive application, the depth should not exceed 10mm. ARDITEX NA will dry in as little as 3 hours and can then be tiled as normal using an appropriate ARDEX Cement-Based Tile Adhesive.


  • How do I tile on to fibreglass?

    Answer:

    Before tiling to fibreglass or GRP, in swimming pools and spas for example, first roughen the surface with a wire brush or sandpaper. The fibreglass should then be tiled using ARDEX X 60 PU FLEX applied direct (without priming). It will dry in 3 hours and the tiles can then be grouted using an appropriate ARDEX Tile Grout.


  • How do I tile on to steel?

    Answer:

    To tile steel in internal and external locations, including wet areas, use ARDEX X 60 PU FLEX applied direct (without priming). It will dry in 3 hours and can then be grouted using an appropriate ARDEX Tile Grout.

    Alternatively, in indoor & dry areas only, prime the steel using ARDEX P 82. Once dry, it can then be tiled as normal using an appropriate ARDEX Cement-Based Tile Adhesive.


Waterproofing

  • Why should I waterproof or tank bathrooms, showers and other wet areas* before tiling? *Does not include swimming pools

    Answer:

    The underlying substrate in wet areas, or substrates adjoining wet areas, is often moisture-sensitive e.g. plaster, plasterboard and even some proprietary tile backer boards. Even when they are tiled, water can still get to the background through cementitious grout joints and adhesive bedding, as they are porous in nature and allow moisture to be absorbed through them. Ultimately, this results in damp and mould; and over time, it can transfer to adjoining rooms and/or cause the tiles to de-bond. As recommended by BS 5385-1: 2018 and BS 5385-4: 2015, ensure wet areas in both domestic and commercial installations are waterproofed (we recommend ARDEX WPC) to prevent unsightly and costly water damage.


  • How do I waterproof or tank bathrooms, showers and other wet areas* before tiling? *Does not include swimming pools

    Answer:

    Wet areas should be waterproofed before tiling using ARDEX WPC to protect moisture-sensitive backgrounds behind the tiles, and also prevent moisture-ingress into adjacent rooms. Holes, gaps and joints should be waterproofed using a slump-free mix (MIX ONE) applied with a trowel, which will dry in approximately 1 hour. Overall surface waterproofing can then be achieved with two coats of a flowing/paintable mix (MIX TWO) applied with a paint roller or brush, with 30 minutes allowed between each coat. The second coat will dry in approximately 60 minutes, and can then be tiled as normal using an appropriate ARDEX Cement-Based Tile Adhesive.

    The following is a demonstration video for ARDEX WPC: