Tyvek Pro (Tape) – Two-layer underlay and roofing underlay membrane (UDB/USB) with integrated self-adhesive strip (75 m² roll)

Tyvek Pro (Tape) is a high-quality, two-layer, tear-resistant underlay and roofing underlay membrane (UDB / USB) based on proven flash-spun-bond technology. It has been specially developed for demanding roof structures and features a particularly robust functional layer with a thickness of 175 μm.

This membrane offers an exceptional combination of protection and durability. It is highly vapour-permeable, allowing for safe moisture exchange, whilst being completely windproof to minimise heat loss. A standout feature is its high temperature resistance of up to +100°C, which gives the membranes excellent resistance to ageing. It is also suitable for use as temporary roofing and provides reliable protection for the roof even during the construction phase.

Technical data sheet

Key features and benefits:

• Integrated tape: The Tyvek Pro Tape version features an integrated tape for quick and secure seam sealing.

• Flash-spun-bond technology: Ensures unique material properties and durability.

• High heat resistance: Temperature-resistant up to +100°C for maximum safety even at high temperatures beneath the roofing.

• Robust construction: Two-layer, tear-resistant with a functional layer thickness of 175 μm.

• Warranty: 20-year product warranty (subject to: registration of the building project, use within the Ampack system and compliance with the warranty terms and conditions).

Technical details & delivery format:

• Roll dimensions: 1.5 m x 50 m (75 m²)

• Functional layer thickness: 175 μm

• Application: Roofing underlay membrane (UDB), roofing underlay membrane (USB), temporary roofing

• ZVDH classification: UDB-B / USB-A

• Base weight: 124 g/m²

• Temperature resistance: Extremely resistant from -40 °C to +100 °C

• Water vapour permeability (sD value): 0.02 m (highly vapour-permeable)

• Resistance to water penetration: Class W1 (tested for resistance to driving rain by TU Berlin)

• Exposure time to the elements: Up to 6 months (suitable as temporary roofing)

• Minimum roof pitch: 10°

• Maximum tensile strength (longitudinal / transverse): 270 / 225 N/5 cm

• Tear resistance (longitudinal / transverse): 150 / 150 N

• Fire behaviour: Class E (according to EN 13 501-1) / CH: RF 3 (cr)

• Cold-bending behaviour: Flexible down to -40 °C

Installation tips

Installation: Lay the Tyvek Pro (Tape) parallel to the eaves on the existing supporting structure or formwork. Ensure an overlap of 15 cm. Fix the material concealed within the overlap area using broad-head nails or staples.

Seam bonding:

• Seal the longitudinal overlaps to make them rainproof and windproof using the integrated tape. Alternatively, Ampacoll XT (60 mm) can be used. Rub the adhesive joints thoroughly.

• Transverse joints must also overlap by 15 cm and be sealed with Ampacoll Superfix or Ampacoll XT 60 mm.

Counter-battens and nail seals: To ensure watertightness beneath the counter-battens, nail seals such as Ampacoll ND or the nail sealing tape Ampacoll ND.Band / ND Duo must be fitted.

Connections and penetrations:

• Permanently bond connections to inlet flanges, chimneys, roof windows and upstands using the liquid adhesive Ampacoll Superfix (secure mechanically where necessary).

• Seal penetrations such as ventilation pipes or flue pipes using the butyl rubber tape Ampacoll BK 535.

• Important: Porous, dusty or fleece-like substrates must be primed (pre-treated) with Ampacoll Primax or Ampacoll Airmax before using Ampacoll BK butyl tapes.