Building regulations for insulating a roof heat rises and therefore the building regulations requirements for heat loss through roofs are more stringent than those for walls.
Roof sarking regulations.
Unfasten all clips that take hold of the roof tiles.
The junction between roof and wall must be sealed.
Roof sarking should be installed under battens with a maximum sag of 40mm to manage thermal performance and be angled at 2ยบ to facilitate drainage.
If the homeowner s roofing condition falls into any of those criteria they will be obliged to follow the required regulations such as.
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.
Recommended for use in colder climates.
Vapour permeable sarking controls the risk of condensation by allowing water vapour to be.
Sarking boards with a gap of 2 3 mm between each one.
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.
When rolling horizontally the top layer should overlap the bottom layer by 150mm.
Recommended for use in warmer climates.
Enviroseal proctorwrap roof sarking is vapour permeable allowing water vapour to pass through it whilst preventing the entry of liquid water and dust from outside.
Insulation sitting either between and under or between and over the rafters.
The need to install a roof sarking will depend on several criteria bushfire attack level length of the rafter roof pitch and tile profile.
As a general guide it is considered good building practice to sark all tiled roofs as it helps to address the requirement within the bca to protect the.
Roof tiles or other covering.
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.
The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m.
If some are damaged replace them with new ones after putting the tiles back.
Identify the roof dimension to know the correct measurement and number of sarking sheets to buy.
Roofs must be fully sarked.
Roof cladding materials must be non combustible.
When the product is installed under battens it must be rolled out horizontally.
Roof cladding materials must be non combustible.
Gutters and other openings must be fitted with non combustible ember guards.
A typical roof build up that contains sarking is as follows from the bottom.
What is the right roof sarking type to choose.
