Permo Sec Metal 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. The waterproof barrier prevents condensation that occurs on the underside of the metal roof covering from re-entering the roof structure. Any build-up of moisture between the outer metal roof covering and the Permo Sec Metal will be channelled safely to the eaves due to the nature of the 8mm mesh outer layer. Additionally, it has an acoustic value of 8db, to help reduce the transmission of external structure sounds, such as heavy rain.
Suitable for metal roofs with a minimumpitch of 3°.
Can be laid over rigid insulation or timber boarding.
Permo sec metal should be laid in accordance with our full installation instructions.
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.