Cypress pine is included in Appendix E of AS 3959, along with several other softwoods of density 650 kg/m3 or greater, which makes them suitable for window joinery and door frames up to and including BAL-19. In these areas there are no requirements for fascias or bargeboards. Appendix H of AS 3959, titled Generic Roof Systems, refers to specific combinations of materials deemed to satisfy the requirements for BAL-FZ areas. There is no requirement for fascias to be any particular type of timber as the system does not depend on the fire resistance of the fascia. The fascia is backed up by a layer of fire-resistant plasterboard and a further layer of plywood, and can be any type of timber, not necessarily cypress pine.BAL-FZ design
Answered on 29-04-2021
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