Is Sarking Required Under Colorbond Roof

A layer of sarking reflective foil laminate or rfl is then put in place.

Is sarking required under colorbond roof. 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. 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. In many installations both are installed. 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.

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. Ventilated roof spaces in high humid climates like queensland that are under metal roofs can result in excessive condensation within the roof space at night. In bushfire prone areas flying embers cannot enter this space through the roof due to sarking protection. Sagging of the sarking to facilitate drainage to the gutter is required but not more than 40mm.

The other type is called underlayments aka sarking. 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. Sarking and the building code of australia. Sarking is not mandatory however it helps to protect your roof frames from acquiring moulds stains and other decaying issues.

Roof sarking improves performance and comfort by providing the following benefits. Vapour permeable sarking controls the risk of condensation by allowing water vapour to be. The flexible membrane is usually installed under the battens to provide thermal insulation and to prevent water and dust penetration in the roof space.