The mineral waterproofing of balconies and terraces is carried out with crack bridging systems like KÖSTER NB Elastic Grey, KÖSTER 21 or KÖSTER NB 4000. These waterproofing materials are resistant to foot traffic and can be covered with tiles. They also have the ability to create an excellent bond to damp substrates.
Before installing the waterproofing system, concrete repair work is done with KÖSTER Betomor Multi A. The concrete surface must be mechanically cleaned and a solid substrate achieved. Reinforcement steel has to be thoroughly cleaned from rust by sandblasting. In case of severe damage, the reinforcement has to be strengthened. To level the surface, the self-levelling underlayment KÖSTER SL Premium is highly recommended.
The substrate is hardened and prepared with the primer KÖSTER Polysil TG 500. Fillets are installed with KÖSTER WP Mortar. In the wall-floor-junction and all areas in danger of cracking KÖSTER Superfleece is embedded into the fresh first waterproofing layer. Full area reinforcement is carried out by embedding KÖSTER Glass Fiber Mesh into the first layer of the waterproofing material as well.
The final finish with the installation of tiles can be carried out with the flexible adhesive KÖSTER BD Flexible Tile Adhesive.
Always adhere to the specifications in the respective Technical Guidelines.