Ampatex SB 130 Plus – formwork membrane, vapour control layer and airtight sealing (75 m² roll)

Ampatex SB 130 Plus – Formwork membrane, vapour control layer and airtight sealing (75 m² roll)

The Ampatex SB 130 Plus formwork membrane is a high-quality, two-layer vapour control layer and airtight sealing solution for use in pitched roof applications. It combines the functions of a vapour control layer, airtight sealing and formwork membrane in a single product and is specifically designed for demanding applications in timber construction as well as for over-rafter insulation.

Thanks to its two-layer construction comprising thermally bonded continuous fibres with an integrated PP filler layer (100% polypropylene), the membrane offers impressive robustness and durability. It can be left exposed to the elements for up to three months, making it ideally suited to the harsh conditions of everyday construction sites. The translucent design allows for a clear visual inspection of the substructure during installation.

Ampatex SB 130 Plus is suitable for both internal use and exterior use on pitched roofs, particularly externally beneath the thermal insulation on sanded and unsanded timber boarding. The integrated adhesive strips on both sides facilitate quick, secure and airtight sealing.

Data sheet

Product benefits at a glance

• Two-layer vapour control layer, airtight sealing and formwork membrane in a single system

• Can be left exposed to the elements for 3 months

• Translucent – the substructure remains visible

• Highly robust and tear-resistant, ideal for use on construction sites

• Tested for airtight sealing and watertightness

• Ideal for over-rafter insulation

• Tapes integrated on both sides for secure overlap bonding

Areas of application

• Inside and outside of pitched roofs

• On timber boarding (sanded and unsanded)

• Externally, beneath the thermal insulation

• On the warm side of the thermal insulation layer

Form of supply

• Ampatex SB 130 Plus, roll with integrated tape on both sides

• Roll dimensions: 1.50 m × 50 m = 75 m²

Technical specifications (extract)

• Grammage: approx. 135 g/m²

• sD value: approx. 40 m

• Water resistance: passed at 2 kPa

• Fire behaviour: Class E

• Maximum tensile strength (longitudinal/transverse): 220 / 220 N per 5 cm

• Elongation at break (longitudinal/transverse): 25 per cent / 25 per cent

• Tear resistance (longitudinal/transverse): 230 / 210 N

• Minimum roof pitch: 5° (additional measures required for pitches between 5° and 9°)

Installation instructions

Ampatex SB 130 Plus is laid parallel to the eaves on a flat substructure. Overlaps of at least 10 cm must be concealed with nails and bonded with Ampacoll XT for airtight sealing. Connections, penetrations and upstands (e.g. around chimneys, roof windows or vent pipes) must be professionally sealed using the appropriate Ampacoll system adhesive tapes. Any damage to the membranes must be sealed airtight immediately. Dusty or porous substrates must be primed in advance with Ampacoll Primax or Ampacoll Airmax.

Ampatex SB 130 Plus offers a reliable, standards-compliant solution for permanently airtight and moisture-proof roof structures in modern timber construction.