Airtight Membrane Package 8 Pcs

Installation instructions for between-rafter insulation

• Fix Wütop DB 2 to the warm side of the heat insulation using a stapler (hammer tacker or hand-held stapler) and secure with battens


• The smooth side always faces toward the installer


• Vertical overlaps must always lie on a rafter


• Ensure sufficient overlap: Horizontal overlap: at least 10 cm (overlap strip), vertical overlap: approx. 20 cm


• All overlaps and stapled points must be given an airtight seal using suitable adhesive tape (Eurasol)


• For airtight attachment to masonry, the membrane is bonded using Wütop film adhesive and secured with a clamping batten, if necessary


• Take care not to damage the membrane during installation


• Before the interior cladding is attached (gypsum plasterboard, wood panelling etc.), check again that the vapour retarder has been correctly installed and correct if necessary

Installation instructions for over-rafter insulation

• Wütop DB 2 is ideal for use as a vapour retarder for over-rafter insulation


• Installation: Same procedure as for between-rafter insulation


• Please keep in mind: May be exposed to weather for max. 6 weeks

Installation instructions for renovation of old buildings

• Sharp objects (e. g. nails) that protrude from the interior cladding into the rafter area must be removed to avoid damaging the vapour retarder


• Wütop DB 2 is laid over the rafters from the outside with the fleece facing the room interior. Install with the smooth side facing outwards


• All overlaps and openings must be given an airtight seal using suitable adhesive tape (Eurasol)


• Recommendation: Secure Wütop DB 2 to the rafters using clamping battens


• Bond joints at the eaves (eave beams or masonry) using Wütop film adhesive. Additional mechanical fixing with clamping battens is recommended


• Wütop DB 2 vapour retarder must not be used to renovate interiors in which the humidity is continually over 60%


• According to DIN 4108 part 3, structures that do not conform to standard construction methods must be verified with a calculation (dew point calculation). Therefore, the use of Wütop DB 2 for renovation work must be agreed upon beforehand by Würth Application Support