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Is it possible to use unseasoned red stringy bark beams to support a structure on which an earth roof can be constructed?

Woodsolutions Answer +

It is possible to use unseasoned red stringybark beams but engineering design will be needed, taking into account the load imposed by the earth roof, the stress grade of the timber and the span of the beams. Note that unseasoned red stringybark can shrink by up to 9.8% of its dimension in drying from green to seasoned, and not every piece will shrink by the same amount. Your timber can be visually stress graded to Australian Standard 2082, Timber - Hardwood - Visually stress-graded for structural purposes, and will produce the grades F8, F11, F14 and F17 depending on quality.

Red stringybark

Do you have any installation advice on costing for large glulam members?

Woodsolutions Answer +

The cost of installing large glulam members would be very much specific to the particular job, depending (for example) whether a large crane is needed, whether specially fabricated steel brackets are required to connect secondary members, etc. It's possible that the Glued Laminated Timber Association of Australia (GLTAA) could advise you but we doubt that a generalised figure would be meaningful. The GLTAA has a website here:

Glulam installation

Do F17 LVLs compress under weight?

Woodsolutions Answer +

Wood may compress under an applied load, depending on the load and the type of wood. Resistance to compression is a function of the compression strength of the particular species of timber. It varies according to whether the load is applied perpendicular or parallel to the grain of the member, ie. whether the member is a beam or a column. This value is sometimes termed "bearing strength". 

Compression strength
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