BWK Difflex Convec Métal roofing underlay with structured mat

Description

An underlay intended for metal roofs, made up of two polypropylene non-wovens and a central functional membrane, completed on the surface by a woven structured polypropylene mat. This mat separates the metal sheet from its substrate and leaves an air gap, which limits the risk of corrosion and preserves both the look and the durability of the covering material. It also cuts impact noise during heavy rainfall by about 5 decibels. Highly permeable to water vapour, the underlay protects against rain, wind, dust, soot, pollen and powder snow, drains any condensate towards the eaves and shelters both insulation and structural timber from moisture. The SK version has two adhesive strips along the edges for a glue-on-glue bond at the transverse overlaps, effective even in damp weather. It complies with NF EN 13859-1. Rolls of 37.5 m².

Technical sheet · 2 document(s)