At Austim, we proudly distribute merbau timber Magna Glulam timber posts and timber beams in Western Australia. Magna Merbau Overview Brochure


Magna Glulam is manufactured by a licensed plant in accordance with Australian Standards AS1328 which requires manufacturers to maintain third party audited quality assurance systems monitored by the Glue Laminated Timber Association of Australia. This involves periodic factory visits and regular structural testing in-house and also by the GLTAA.


Magna Glulam is suitable for use in fully exposed weather conditions known as Service Class 3. This is because it is made from a naturally durable timber using Phenol-Resorcinol Formaldehyde (PRF)—a highly durable A bond adhesive. Merbau timber Magna Beams are also resistant to termite attack.

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Service Class 1: Environmental conditions not to exceed an EMC of 12% in service
Service Class 2: Environmental conditions with EMC up to 20% in service
Service Class 3: EMC will exceed 20% in fully exposed structures bridges, pergolas

span tables

Australian based business the HR Design Group have created the below Span Tables for Magna Glulam products based on the relevant Australian Standards.

Magna Product Information and Complete Span Tables (file approx 5 MB)

Individual Span Tables below

Verandah Beams - Sheet/Tile N3

Verandah Beams - Sheet/Tile C2

Verandah Beams - Light Sheet Roof N2

Verandah Beams - Light Sheet Roof C2

Verandah Posts - Sheet N3/C2

Verandah Posts - Tile N3/C2

Deck Bearers

Deck Joists

Floor Bearers

Floor Joists

Rafters - Sheet/Tile N3

Rafters - Sheet/Tile C2

Rafters - Light Sheet Roof N2/C2

Roof Beams - Sheet N3

Roof Beams - Tile N3

Lintels - Sheet/Tile N3

Lower Lintels - Sheet N3

Lower Lintels - Tile N3

Upper Lintels - Sheet/Tile N3




The high strength of Magna Glulam has been established by initial qualification testing and is checked by daily production testing at the plant. All timber beam sizes were determined to be GL17 and the timber posts are classified GL13. The timber is a hard timber rated 2 in a six-class scale, meaning it withstands knocks and daily wear and tear far more successfully than timbers such as Radiate Pine.

View the GLTAA strength-rating table


Merbau timber has very low shrinkage rates (1.5% radial & 2.5% tangential), which means that Magna Glulam stays straight in changing weather conditions. It also means that Magna Glulam is much less prone to surface cracking than other timber.


Merbau decking and timber (kwila) is listed as a bushfire resisting timber and PRF adhesive does not affect the fire performance of glulam. As a result, Magna Glulam is suitable for construction in bushfire-prone areas. 


Only legal and sustainable timber is used to make Magna Glulam. ETH’s factory was one of the first in Indonesia to embark on the Smartwood program of the Rainforest Alliance (which commits suppliers to achieving FSC status in a defined time-frame). The second stage, Verified Legal Compliance, was achieved in 2014. 


One thing to be aware of with merbau timber is that it is prone to tannin-bleed when in contact with water and should be kept dry at all times prior to coating with a deck oil or paint. Once coated, bleeding is significantly reduced. However, care should still be taken when installing merbau timber above or near lighter coloured paving.

Austim are the structural timber suppliers Perth trusts because we have all the answers.
Got questions about merbau structural timber beams and post? Ask Austim!