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I am looking for precise section sizes of your 163 x 30 LOSP double rebated door jamb


We are looking to use a timber portal frame for a building we are currently designing. The building is quite simple, rectangular with metal sheet cladding. The portals are required to offer a clear span of 25m. Can you please advise what a rough lead time may be for such a product, and additionally could you provide some advice or reference to the fire resistance properties of these sort of portal frame products?

Woodsolutions Answer +

You will have to contact a company that produces timber portal frames to discuss lead times, for example Timberbuilt Solutions could advise you. They have a website here: www.timberbuilt.com.au. Regarding fire resistance, this can be calculated by reference to Australian Standard 1720, ‘Timber Structures’, Part 4: Fire resistance for structural adequacy of timber members. Possibly Timberbuilt can also advise on this point.


I am building a pergola that has no roof on it so the timber beams are open to the elements. The design also has beams that over hang so are not constrained. Because of the cost of recycled spotted gum, I am looking at Vic ash Glulam. My concern is whether glulam will bow or not in these type of application.

Woodsolutions Answer +

Glulam is a very stable product and is unlikely to bow even in an external application. However, we would be concerned about the durability of untreated Vic ash glulam in the long term. It’s not a highly durable timber under full weather exposure. Preservative treated Vic ash is now available, known as ‘IronAsh’, so if the glulam you are considering is made from preservative-treated material it should give satisfactory performance. Otherwise it would be a good idea to consider a more durable species.

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