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Permo® sec / Permo® sec SK

Very strong and robust metal roof underlay

  • 5-layer fleece foil combination with reinforcement grid and PP monofilament mesh
  • Covers irregularities within roof deck that could de-form metal roof covering
  • Fully waterproof secondary barrier to moisture penetration
  • Fully vapour permeable
  • Acoustic value of 8db helps reduce the transmission of external structure borne sounds
  • Prevents condensation that occurs on the underside of the metal roof covering from re-entering the roof structure
  • Provides an air space below zinc coverings to allow protective oxidation to form
CE
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Product information

Permo® sec is a very strong and robust vapour permeable waterproofing barrier that is installed as a separating layer between copper, zinc, aluminium and stainless steel standing seam roof finishes and the supporting deck.

Technical data

MaterialOuter layer of polypropylene mesh bonded to a vapour permeable membrane. 5-layer fleece foil combination of polyolefin, hydrophobic treatment and PP monofilament mesh
Weight550g/m²
Thickness0.85cm
Water vapour transmission EN 12572 (sd value)0.03m
Reaction to fire EN 13501-1, EN 11925-2E
Water column, EN 20811> 3000mm
Resistance to water penetration EN 1928W1
Resistance to air penetration< 0.1m³/m² h 50 Pa
Tensile strength longitudinal / transverse EN 12311-1320N/50mm290N/50mm
Elongation longitudinal / transverse EN 12311-15%5%
Resistance to tearing (nail shank) longitudinal / transverse EN 12310-1280N340N
Melting point>200°C
Acoustic damping value8db
Resistance to temperature-30ºC to +80ºC
UV-resistance1)4 months
1) Natural weathering Central Europe

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