Insulated Panel Flashings

Flashings detailing is similar to that used with single-skin roof and wall cladding. The main exception is that internal joints should be designed and sealed so that water vapour cannot impregnate the system.

The panels at the ridge and other edges of the roof should be sealed and the lining closed with a metal trim mounted on the ridge purlins as detailed by the manufacturer. Any gap between the ends of the composite panels should be insulated to eliminate cold spots or cold bridging. They can be sealed using in-situ injected foam or mineral fibre. In high-humidity applications, the liner trim should be sealed to the panels. At end-laps or gaps, foam should be injected to provide a vapour-tight seal.

Where required by the manufacturer, eaves panels should have the ends turned down to prevent capillary action on the underside of the sheet. A metal flashing may also be installed to cover the exposed end of the insulation and metal liner when panel ends are visually exposed.