For roof sarking to be effective below metal roofing, the selection of the appropriate type of sarking material must be made with due consideration to condensation risk which can be influenced by the following
Environmental
The risk of condensation formation under metal roofs increases in colder climates (refer to the climate map on the Bradford website) where the temperature of the metal roof sheet, purlins/rafters and battens can fall below dew point (particularly metal battens). In these regions, the use of vapour permeable sarking or Anticon roofing blanket directly under the roof sheet is recommended to reduce the risk of condensation.
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Very humid and very cold climates
The locations require specific design solutions to control condensation and CSR Bradford should be consulted during project design.
Please review sarking for your climate zone and recommended metal roof sarking solutions to ensure you get the most effective sarking solution for your home.
