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.

Is sarking required under colorbond roof.

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. In many installations both are installed. Roof sarking is a membrane that is fitted during tile or metal roof construction.

A layer of sarking reflective foil laminate or rfl is then put in place. While this isn t strictly compulsory in all cases sarking s generally considered to be very important for metal roofs to help prevent condensation. 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. In bushfire prone areas flying embers cannot enter this space through the roof due to sarking protection.

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. 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. Vapour permeable sarking controls the risk of condensation by allowing water vapour to be. 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 is not mandatory however it helps to protect your roof frames from acquiring moulds stains and other decaying issues. Not only does it help your roof thrive in climate changes but it also improves the overall thermal comfort indoors. 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.