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Breather Membrane UV

ME011 is a breather membrane that can be directly laid onto sheathing board or thermal insulation behind rain screen façades or curtain walling with up to 30 mm wide open joints.


This breather membrane can be directly laid on sheathing board or thermal insulation behind partially open rain screen façades or curtain walling with up to 30 mm wide open joints. The open joints should represent a maximum of 40% of the overall façade area (i.e. for a 30 mm gap width, the panels/slats should be a minimum width of 45 mm each). The membrane is made of a special, monolithic functional membrane covered with two layers of non-woven water-repellent polyester.

  • UV resistant – 6 months UV stable
  • Can be used within partially open facades
  • Non-branded, plain black finish - suitable for visible applications
  • Wide range of in-service temperature resistance
  • Highly vapour open
  • Air-tight and weather-tight
  • Available with self-adhesive strip

Usage Guidelines

  • Apply the membrane horizontally, starting from the bottom to ensure natural water run-off, fixing each sheet with staples or SP525 adhesive to the sheathing board or other substrate.
  • When applying the membrane from the roll, to achieve maximum UV stability, and to ensure a good bond (if applicable) the outer (fleece) face of the membrane must be orientated towards the structure, and the inner (smooth) face must be left exposed to the UV light.
  • For fixing (mechanical or bonding), a supporting area of minimum 40 mm is required.
  • For correct joint formation, a minimum overlap of 100 mm is required. If not using self-adhesive, seal the overlap with SP525, OT301, ME315 or ME316 tape for a wind tight connection.
  • Mechanical damage, penetrations or connections should be sealed with SP525, SP925, OT301, ME315 or ME316 depending on the application. If unsure, please contact tremco illbruck for advice.
  • When likely to be exposed to weather for an extended period, it is recommended that the membrane is adhered around the full perimeter. This prevents damage due to ingress of wind behind the membrane. It is also beneficial to apply dabs of adhesive at approximately 500 mm centres across the surface area to aid membrane stability.
  • In combination with an interior vapour barrier with sd value >2 m (e.g. illbruck ME003), a condensation risk analysis will not be necessary.

Technical data

PropertyTest MethodResult
Grammage Approx. 120 g/m² 
Thickness EN 1849-2Approx. 0.4 mm
Dimensional AccuracyEN 1107-2 < 1% 
Reaction to FireEN 13501-1 Class E
Resistance to Water Penetration EN1928W1
After AgeingEN 1297/1296W1
Maximum Tensile Strength - Lengthwise/CrosswiseDIN 12311-1Approx. 400/230 N ± 15%
     After AgeingEN 1297/1296>75 % of value as new
Elongation of Break - Lengthwise/CrosswiseEN 12311-1

Approx. 35/25%

     After Ageing EN 1297/1296>75 % of value as new
Tear Growth Resistance / Nail ShankEN 12310-1Approx. 120/130 N ± 25%
Vapour Diusion - Equivalent Air Layer Thickness EN ISO 12572 SSd-value: Approx. 0.15 m
Air PermeabilityEN 12114 Approx. 0.1 m³/m².h.50 Pa
Service TemperatureEN 13859-1 -40°C to +120°C
Flexural Behaviour in Cold ConditionsEN 1109 < -20°C 
UV Resistance 6 months
Storage Store in shaded, dry conditions and avoid stacking pallets
Shelf Life 1 year when stored as recommended in original unopened packaging

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