Mineral waterproofing for balconies and terraces demands the utilization of crack-bridging systems such as KÖSTER NB Elastic Grey or KÖSTER NB 4000. These waterproofing materials are renowned for their exceptional robustness, resistance to pressurized water, tolerance for occasional foot traffic, and even the capability to accommodate tile coverings. Their standout features lie in their ability to form a strong bond with damp substrates, and long-lasting protection thanks to their remarkable elasticity.
As is customary with any waterproofing project, the concrete surface demands meticulous preparation, requiring mechanical cleaning until a solid, well-prepared substrate is achieved. The reinforcement steel must undergo a thorough rust removal process via sandblasting, reaching a minimum grade of Sa 2 ½. In cases of substantial damage, reinforcing the steel is imperative.
Prior to the installation of the waterproofing system, concrete repair work, and fillet installation can be effectively executed using KÖSTER Betomor Multi A. When surface leveling or slope creation is required, KÖSTER Repair Mortar stands as the highly recommended solution. Substrates, in general, are hardened and primed with KÖSTER Polysil TG 500.
Fillets at wall-floor junctions, intricate details, and overall (full area) reinforcement are meticulously realized by embedding KÖSTER Glass Fiber Mesh into the initial fresh layer of the waterproofing material. Application of the second layer should commence once the first layer is no longer susceptible to damage during the application. The system is completed with the tile installation, accomplished with the versatile adhesive KÖSTER BD Flexible Tile Adhesive.
It is of utmost importance to consistently adhere to the specifications outlined in the relevant Technical Guidelines for optimum results and longevity.