Is Sarking Required Under Colorbond Roof

Sarking and the building code of australia.

Is sarking required under colorbond roof. Sagging of sarking to avoid the sarking contacting the underside of the roof sheet but not more than 40mm is recommended to avoid temperature transfer from the roof sheet. Roof sarking improves performance and comfort by providing the following benefits. Csr recommends that all tiled roofs with a pitch of less than 20 are sarked and the bca mandates this requirement for rafter lengths greater than 4 5 metres. While this isn t strictly compulsory in all cases sarking s generally considered to be very important for metal roofs to help prevent condensation.

Lighter coloured roofs irrespective of material reflect more heat than darker shades. Commonly referred to as sarking. What is roof sarking. Roof sarking is mandatory in all bal 12 5 to 40 rated areas to meet the bush fire ember attack requirements in accordance with australian standard 3959 where it provides a secondary form of ember protection for the roof space1.

Vapour permeable sarking controls the risk of condensation by allowing water vapour to be. It is mandatory under the building code of australia bca that all tiled residential roofs regardless of roof pitch with a rafter length greater than 6 metres must be sarked. You can prevent condensation dripping off the underside of metal roofing onto the ceiling by installing sarking under the metal roof or closing the vents at night to prevent night air from entering the roof space. Helps protect your home from unseen mould growth or even worse ceiling staining or permanent damage which can result from the entry of storm driven rain into the roof cavity.

A layer of sarking reflective foil laminate or rfl is then put in place. Sarking is pliable laminated membrane well that s how bradford describes anyway. Sagging of the sarking to facilitate drainage to the gutter is required but not more than 40mm.