Ampatex LDA 0.02 plus renovation vapour barrier – 75 m² with integrated tapes

Ampatex LDA 0.02 plus – Highly vapour-permeable renovation vapour barrier (75 m²)

Ampatex LDA 0.02 plus is the ideal solution for energy-efficient roof refurbishment from the outside. As a three-layer, highly vapour-permeable airtight membrane, it has been specially developed to be installed over the existing supporting structure. This enables efficient refurbishment without the need to remove the existing interior cladding or insulation.

Thanks to its extremely low sD value of 0.02 m, the membrane is highly permeable to water vapour, whilst at the same time guaranteeing absolute airtight sealing (a-value < 0.004). The integrated tapes on both longitudinal edges ensure quick, secure and system-compliant bonding of the overlaps.

Data sheet

Your benefits at a glance:

• Maximum time savings: The adhesive tapes integrated on both sides enable rapid wind and airtight sealing without the need for additional adhesive tapes in the overlap area.

• High mechanical strength: Thanks to its high tear and nail-pull resistance, the membrane offers maximum safety during the installation phase.

• Easy installation: A printed cutting guide makes it easy to cut the membrane to size directly on the roof.

• Weather protection: The membrane is suitable for use as temporary roofing and can withstand exposure to the elements for up to 2 weeks.

Applications

Ampatex LDA 0.02 plus is used as an airtight membrane for external roof renovation. It is the perfect choice when the existing between rafter insulation remains in place, but the interior cladding does not provide sufficient airtight sealing.

Technical highlights:

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

• Base weight: 175 g/m²

• Water vapour permeability (sD value): 0.02 m

• Resistance to water penetration: Class W1 

• Temperature resistance: -40 °C to +80 °C

• Fire behaviour: Class E in accordance with EN 13 501-1

• Maximum tensile strength: 350 N / 5 cm (longitudinal) and 300 N / 5 cm (transverse)

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

Important installation instructions

Preparation and installation:

Ensure that the rafter spaces are fully insulated. There must be no air gap between the insulation and the top edge of the rafters. Install Ampatex LDA 0.02 plus parallel to the eaves, with the printed side facing the installer.

Fixing and bonding:

• The overlap must be at least 10 cm.

• Use the integrated tapes for the longitudinal joints and rub the adhesive areas thoroughly.

• Mechanical fixing is carried out concealed within the overlap area using broad-head nails or staples.

• Transverse joints must also overlap by 10 cm and be sealed with system adhesive (e.g. Ampacoll Superfix or Ampacoll XT).

Connections and details:

• Connections to chimneys, roof windows or inlet flanges must be permanently bonded with Ampacoll Superfix.

• Penetrations (e.g. ventilation pipes) should be sealed with Ampacoll BK 535 butyl rubber tape.

• Porous or dusty substrates must be pre-treated with a suitable primer (Ampacoll Primax or Airmax).

Recommendation for additional insulation:

To reliably prevent condensation, the additional insulation should be installed immediately after laying. As a rule of thumb, the additional insulation should account for approximately one-third of the total insulation thickness. Please also observe national thermal insulation standards and the specifications provided by the insulation materials manufacturers.