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Permo® air-open and vapour-permeable underlays
Permo sec is a 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.
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Material
Outer layer of polypropylene mesh bonded to a vapour permeable membrane. 5 layer fleece foil combination
of polyolefin, hydrophobic treatment and PP monofilament mesh.
Installation
The product is laid between the timber deck/insulation and the outer metal roof covering and can either be laid horizontally or vertically and is fixed using non-ferrous staples or flat head clout nails on the overlap. Permo sec should be laid in accordance with our full installation instructions.
| Technical data | |
| Thickness | 8.5 mm |
| Weight, EN 1849-2 | 550 g/m2 |
| Water vapour transmission sd-Value, EN 12572 | 0,03 m |
| Water column, EN 20811 | >3000 mm |
| Resistance to water penetration, EN 1928 | W1 |
| Resistance to air penetration | <0,1 m3/m2 h 50 Pa |
| Reaction to fire, EN 13501-1, EN 11925-2 | Ε |
| Resistance to temperature | - 30 °C έως + 100 °C |
| Melting point | 200 ° C |
| UV exposure EN 13859-1 | 4 months |
| Acoustic damping value | 8db |
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