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Question

The Australian Standard (and NCC) specifiy a cypress pine fascia in Appendix H. Is Cypress pine more fire resistant than softwoods more commonly used for fascias?

Woodsolutions Answer +

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
Please note that our answer is based on the best advice available at the time. If the National Construction Code, Australian Standards or local requirements have been subsequently amended, our answer may no longer be correct in all details. For more information, please read our disclaimer.

Question

The EFH fire properties for Tasmanian Oak aren't listed on the website like other species - ie Ignitibility, Spread of flame, Smoke Development Index - could you please advise or update website with them asap?

Woodsolutions Answer +

Tasmanian 'oak' is actually a mixture of the similar species alpine ash, mountain ash and messmate, as explained on our website. Alpine ash and mountain ash are also traded as 'Victorian ash' and you will find Early Fire Hazard properties listed under that name, ie. Ignitability 14, Spread of Flame 8, and Smoke Development 3.

Early Fire Hazard

Answered on 29-04-2021
Please note that our answer is based on the best advice available at the time. If the National Construction Code, Australian Standards or local requirements have been subsequently amended, our answer may no longer be correct in all details. For more information, please read our disclaimer.

Question

We have a junction detail - where a new timber framed [fire rated] wall sits inside the line of an existing double skin brick party wall. Where our new wall rises past the existing brick parapet - we have a weak point in the fire rating.

Woodsolutions Answer +

It should be possible to clad the part of the wall that projects above the parapet with a fire-resisting material to achieve the required fire rating. Our Technical Design Guide #01 shows a similar situation - a copy can be downloaded via this link https://www.woodsolutions.com.au/publications. Refer to Figure 36 where roof lines meet at different levels.

Fire rating

Answered on 28-04-2021
Please note that our answer is based on the best advice available at the time. If the National Construction Code, Australian Standards or local requirements have been subsequently amended, our answer may no longer be correct in all details. For more information, please read our disclaimer.

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