This field poses the highest demands on waterproofing. It must be able to resist the weather, be waterproof and provide a certain structural stability. Also, outside the movements of the construction members are usually comparably large so that it is necessary to use waterproofing systems with high crack bridging capabilities.
Waterproofing of balconies and terraces with liquid applied bitumen based waterproofing systems
Balconies and terraces are constantly exposed to rain,splash water and high temperature fluctuations. Therefore the waterproofing should always be crack bridging.
When working with liquid applied bituminous waterproofing the prepared and clean substrate is primed with KÖSTER Polysil TG 500. A rounded fillet made from KÖSTER Repair Mortar Plus is installed in wallfloor-junctions in order to protect the subsequent layers from damage caused by movement.
The waterproofing is carried out with a liquid applied coating in two layers. Ideally suitable is KÖSTER KBE Liquid Film. Alternatively the rubberized bitumen thick film sealant KÖSTER Deuxan 2C (4 – 6 mm) can be applied. In the wall-floor-junction and areas in danger of cracking KÖSTER Glass Fiber Mesh is embedded into the fresh first waterproofing layer.
A screed protects the waterproofing against mechanical damage. A gliding layer consisting of 2 layers of PE-foil is installed under the screed.
Always adhere to the specifications in the respective Technical Guidelines.
Waterproofing of balconies and terraces with cold applied self adhesive membranes
A fast and easy method for waterproofing balconies and terraces is using the cold applied self adhesive KOSTER KSK waterproofing membranes.
The solid and clean concrete substrate is primed with KOSTER KBE Liquid Film which provides an excellent bond between the concrete and waterproofing layer. In case of temperatures below 0 °C the non water based KOSTER KSK Primer SP is used.
A fillet in the wall-floor-junction can be easily installed by using the KOSTER KSK Triangular Ribbon: Remove the protective foil, press into the primed corner, done! Alternatively, before priming the substrate a fillet made of KOSTER Repair Mortar Plus is applied.
The standard area waterproofing is done with KOSTER KSK SY 15. In case of temperatures below 0 °C KOSTER KSK AW 15 is the material of choice. The waterproofing membranes are simply bonded onto the prepared substrate and overlapped min. 10 cm on each side.
If the waterproofing is applied vertically onto a wall, the waterproofing membrane is mechanically fixed. Connections and overlaps are sealed with KOSTER BS 1 Bitumen Paste. If the top end of the waterproofing is to be plastered, it can be covered with KOSTER Butyl Fix-Tape Fleece.
A screed protects the waterproofing against mechanical damage. A gliding layer consisting of 2 layers of PE-foil is installed under the screed.
Always adhere to the specifications in the respective Technical Guidelines.
Waterproofing of balconies and terraces with mineral based waterproofing systems
The cementitious waterproofing of balconies and terraces is carried out with crack bridging KOSTER NB Elastic (white or grey). This waterproofing is resistant to foot traffic and can be covered with tiles. It also bonds to damp substrates.
Before installing the waterproofing the substrate is hardened and prepared with the primer KOSTER Polysil TG 500. Fillets are installed with KOSTER Repair Mortar Plus. In the wall floor junction and all areas in danger of cracking KOSTER Glass Fiber Mesh is embedded into the fresh first waterproofing layer.
Concrete repair work is done with KOSTER 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.
Minor damages in the concrete surface can be levelled with KOSTER C-Coat, and painting done with KOSTER Silicone Paint White.
Always adhere to the specifications in the respective Technical Guidelines.
