Koster NB 4000

• Koster NB 4000 is a hybrid product that combines the properties of a polymer modified bitumen thick film sealant and a flexible mineral waterproofing slurry
• For waterproofing building structures inside and outside
• Cures rapidly even in adverse weather conditions – Application temperature from + 2 °C
• Rainproof after approx. 2 hours (Insulation board installation after approx. 4 hours – Backfilling after approx. 24 hours)
• High substrate tolerance; can be applied onto old bituminous or mineral waterproofing systems
• Applicable even on slightly damp surfaces
• Tools can be cleaned with water
• Creamy and homogeneous texture
• Crack bridging up to 0.4 mm; suitable for sealing foundation skirting
• Bitumen-free
• UV resistant
• Paintable and coatable with foundation renders

Application

Koster NB 4000 is applied in 2 coats by trowel. The second coat is to be applied as soon as can be done so without damaging the first coat. Areas prone to or in danger of cracking should have Koster Flex Fabric embedded in the fresh first layer.