While traditional methods would require the existing traffic topping and the underlying waterproofing membrane to be removed and replaced, specialised materials based on polyurea allow for repairs without excavation in a single application. They are designed to serve as a waterproofing membrane and traffic topping, and can be applied over the existing surface.
Despite a higher price tag, these waterproofing systems are an optimal solution when application durability is the goal. There is a variety of finishes that comes with a choice of colours and a non-slip texture.
This less expensive (and less durable) option is a good choice for a more temporary solution when there are budget constraints. It is a two-layer application consisting of a non-UV protect basecoat and either a non-UV or a UV-protection topcoat – as required, based on whether the surface is exposed to the weather elements.
To ensure a lasting repair, a well-defined procedure is followed, with the materials used as needed depending on surface type. In each case, the first step is surface preparation – the floor must be clear of any lose material or debris, to ensure proper adhesion.
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After surface preparation, a specialised primer is applied (the primer used depends on the type of coating chosen for the repair). Aggregates are broadcast next to ensure proper membrane bonding and a non-slip surface, for safety. A waterproofing membrane follows. It is then coated with either a polyaspartic or a polyurethane topcoat.
Surface preparation is followed by crack repair and patching, if needed. The floor is primed, and a waterproofing membrane is installed (polyurea- or urethane-based, as requested by the customer). When a polyurea-based membrane is chosen for a basecoat, a polyurethane or a polyaspartic topcoat is applied. In case of a non-UV (aromatic) urethane basecoat, either an aromatic (non-UV) or an aliphatic (UV-protection) topcoat used, as required, based on surface location (whether it is exposed to sunlight or not).