Roof Waterproofing with heat reflection KÖSTER 21

KOESTER 21 is a multi-purpose waterproofing, e. g. for basements, balconies, terraces, tanks and also roofs. A special characteristic of KOESTER 21 is its proven ability to reflect heat radiation. When used as a roof waterproofing for example this helps to reduce cooling costs in warm regions. This video shows the tremendous difference between KOESTER 21 and a bituminous membrane in comparison.