BWK Difflex Thermo ND reinforced roofing underlay

Description

Coated polyester underlay permeable to water vapour, calibrated for heavy-duty fields of use, laid on a supporting deck or over rafters, in contact with the insulation. Certified nail-tight and resistant to driving rain by TU Berlin, it targets low-pitch roofs from 10°, the limit dropping to 5° provided the nail seal is reinforced with Nailtape strips. It also suits renovation, the laying of nailed slates or stone slabs, temporary weatherproofing for a maximum of three months, and mountain climates above 900 metres. Its heat resistance, tested at 150 °C, and its ultraviolet stability allow it to be laid under photovoltaic panels and under dark-coloured roof coverings. It holds a European Technical Assessment under EAD 030218-00-0402, complies with NF EN 13859-1 and 13859-2 and with annex A of the NF DTU 40.29 series, ZVDH class 2. Twenty-year warranty.

Technical sheet · 2 document(s)