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Masterplast Mastermax 3 Classic Breathable Membrane 1,5 m × 50 m = 75 m2/roll
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Masterplast Mastermax 3 Classic Breathable Membrane 1,5 m × 50 m = 75 m2/roll

code: MASTERMAXFELT
£62.00 inc. VAT (FREE UK Delivery*)
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Mastermax 3 Breathable Membranes for use in Warm Non-ventilated and Cold Ventilated Roofs are three-layer polypropylene laminate composites with the nominal characteristics given in

Mastermax Premium breathable membrane is a Type LR membrane for use in warm non-ventilated and Cold ventilated roofs. A vapour permeable and watertight functional membrane with a polypropylene protection layer on both sides. Used as a subsidiary protective layer against moisture (liquid water penetration, wind-blown snow) and wind in pitched roof structures.

  • NHBC Standards 2014 NHBC accepts the use of Mastermax 3 Breathable Membranes for use in Warm Non-ventilated and Cold Ventilated Roofs, provided they are installed, used and maintained in accordance with this Certificate, in relation to NHBC Standards, Chapter 7.2 Pitched roofs.
  • CE marking The Certificate holder has taken the responsibility of CE marking the products, in accordance with harmonised European Standard BS EN 13859-1 : 2014. An asterisk (*) appearing in this Certificate indicates that data shown are given in the manufacturer’s Declaration of Performance.
  • For warm and cold roof applications
  • Highly breathable
  • Robust and hardwearing
  • 1,5 m × 50 m = 75 m2/roll
  • Material: 3-layer beige permeable roof underlay (between 2 layers of PP nonwoven, moisture vapor permeable, water impervious membrane.
  • Application area: Mono (between the foil and the roof covering) ventilated steep roof constructions, suitable as a secondary protection against penetrating under cladding moisture and powder snow , underlayment that can be laid directly on the thermal insulation.
  • Unit weight: 135 g / m 2
  • Sd value: 0.02 m
  • Water resistance : W1 
  • Temperature resistance: (-) 30 ° C - (+) 70 ° C
  • Coverage time: maximum 2 weeks
  • Relevant product standard: EN 13859-1

Straightness: Mass per unit area: 135 g/m2 (±)20 g
Reaction to fire: E
Resistance to water penetration: W1
Water vapour transmission (Sd): 0,02 m
Tensile strength (MD/XD): 200 N/5 cm (±)20% / 110 N/5 cm (±)25%
Elongation at maximum tensile force (MD/XD): ~60% / ~60%
Resistance to tearing (MD/XD): 80 N (±)25% / 70 N (±)25%

Dimensional stability (MD/XD): <3% / <3%
Flexibility at low temperature: (-)24°C
Changing of properties after artificial ageing:
Resistance to water penetration: W1
Tensile strength (MD/XD): max. 30% / max. 30%
Elongation (MD/XD): max. 25% / max. 25%
Additional properties:
Temperature resistance: (+)70°C
Resistance to UV: max. 1 month

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