WP302 Waterproofing – Concrete Balconies (Under Screed)

Preparation:

1. All surfaces to be waterproofed must be firm, clean, dry, sound and smooth. All grease, oil, wax, curing compounds, loose material, paint and any other contaminants must be removed, masonry surfaces must be pointed flush and surface defects repaired. New concrete must be cured for a minimum of 28 days.
2. External corners to be waterproofed must be bevelled to ensure a smooth transition of membrane from vertical to horizontal surfaces.

Installation:

1. Waterproofing installation shall be in accordance with the applicable provisions of the National Construction Code.

   Tile installation shall be in accordance with AS 3958 Installation of Ceramic and Stone Tiles.

2. Install a puddle flange to all waste pipes, ensuring that puddle flanges are recessed into the substrate.
3. Recess the outside edge of the balcony to accommodate TPA Tile Edge Balcony Trim if required. Fix balcony trim using WPA FC and/or Class 3 galvanized screws.
4. Install an appropriate fillet (bond breaker) to all transitions using WPA FC.

   WPA FC is a high-performance, fast-cure, one-component polyurethane sealant.

5. Apply WPA SB primer to non-porous surfaces, such as puddle flange and waterstop angle using the 2 cloth method. (The 2 cloth method is carried out as follows: dampen a clean cloth with an appropriate amount of WPA SB primer, wipe evenly over the non-porous substrate utilizing a rubbing action. With a clean dry cloth, immediately remove all primer residues by implementing a buffing action).

   WPA SB is a fast-drying, solvent-based primer, with exceptional penetrating properties. WPA SB primer is designed to assist in improving adhesion on porous and non-porous substrates.

6. Apply WPA 460 or WPA 560 primer to the substrate to be waterproofed.

   WPA 460 is a two-part, water-based epoxy primer, used to seal concrete and masonry surfaces.

   WPA 560 is a two-part, water-based epoxy primer, designed as a water and vapour-proof coating under waterproofing membranes.

7. Apply WPA 230UV to window and door reveals and upturns/walls due to receive render or paint, in a minimum of two coats to achieve the required dry film thickness.

   Ensure that the previous coat has completely dried before applying the subsequent coat(s). WPA 230UV on the shower walls must be fully cured prior to the commencement of the floor membrane. NOTE: All penetrations must be waterproofed.

   WPA 230UV is an elastomeric, fibre-reinforced, water-based polyurethane membrane system designed for exposed or under-tile applications.

8. Apply WPA 992UV membrane to the floor area in a minimum of two coats to achieve the required dry film thickness. Ensure that the previous coat has completely dried before applying the subsequent coat(s). The WPA 992UV membrane to the floor area must be sufficiently overlapped onto the WPA 230UV previously applied to the walls.

   WPA 992UV is a thixotropic, one-part, liquid-applied, moisture-cured polyurethane waterproofing membrane, suitable for waterproofing most applications.

9. Install TPA Screed to achieve appropriate falls to waste. If an engineered, rapid screed is needed, install TPA Rapid Screed.

   TPA Screed is a pre-blended screed mixture for the installation of cementitious screeds and tile beds, suitable for internal and external floor applications.

   TPA Rapid Screed is a pre-blended, rapid set, engineered screed mixture for the installation of cementitious screeds and tile beds, suitable for internal and external floor applications.

10.  Install tiles using TPA 401M, TPA 501R or TPA Lite tile adhesive.

    TPA 401M is a white, flexible, powdered adhesive for wall and floor applications.

    TPA 501R is a cost-effective, high-coverage, flexible, powdered adhesive for wall and floor applications.

    TPA Lite is a premium grade, white, fibre-reinforced, flexible cement-based tile adhesive, based on a lightweight formulation.

11. Grout tiles using TPA Tru Colour Grout or an approved alternative.

    TPA Tru Colour Grout is a high-performance stain & efflorescence-resistant grout, designed for use with most types of Ceramic, Mosaic, Natural Stone and Glass Tiles.

12.  Install backing rod to all perimeter and intermediate movement joints and seal with TPA Tru Colour Sanitary Silicone or approved alternative.

    TPA Tru Colour Sanitary Silicone is a mould-resistant, non-diluted, high-performance, UV-resistant, neutral cure silicone sealant.