BEARERS, BEAMS, RAFTERS, JOISTS AND FASCIAAvailable in solid and laminated timber
P.N.G village harvest Rosewood
Spotted gum F27
Select Spotted Gum
Kwila ‘merbau’ and P.N.G rosewood . In solid seasoned or k/d timber- 40x19- up to 290x45 DpR to 6.3m- in some sizes.
Blackbutt and spotted gum in kiln dried F27 structural grade, k/d standard and better grade or select grade. Generally available in sections from 42x30 to 290x45 and up to 6.0m long in some sizes.
Vic ash GL18 (internal use) and GL10 native cypress (internal uses). Australian made and tested engineered laminated timber- in sizes up to 460x130 to a maximum transportable length, available custom and curved straight or cambered.
Unless timber is stamped with a structural rating from the mill, or the mill has supplied a ‘certificate of compliance’ for the order , or has been graded by a ‘certified timber grader’ with a written report, it is ungraded timber. When using ungraded timber the onus falls on the installer/ purchaser, for any resulting litigation in the case of product failure and related injury and property damage.
Unseasoned hardwood and Native Cypress- Design factors to consider are-
Timber sag-When spanning using unseasoned beams, they will likely sag under load, even under their own weight. Increasing section size in thickness will not help e.g going from 200x50 to 200x75mm. hardwoods should be increased in depth , not thickness. Cypress is a relatively small tree so you may not be able to increased the depth as it may not be available e.g 250x50mm is rare in long lengths.
Span tables– It is better to over- engineer when using unseasoned structurally graded timber due to potential sag– see above. Look at the sapwood section below for other considerations.
Unseasoned and k/d hardwood fixing–All screws and nails need to be pre-drilled, and bolt holes drilled oversize to allow for opposite expansion/ contraction of timber to steel and reverse seasonally. Cypress is a dense softwood, so has to be treated like a hardwood when fixing.
Sapwood– Native white cypress can be supplied graded to f7. This grade includes the sapwood.The sapwood is not durable.There is no maximum amount of sapwood allowed. Boards lose their volume when the sapwood degrades, and therefore can lose the f7 grade- over a short span of years. For in-ground applications it is recommended that all sapwood be removed below ground level, and that the docked ends be coated with Bituminous paint or a preservative treatment.
Acclimatizing unseasoned hardwoods – All cut ends should be sealed with Caltex log end sealer to reduce cracking and board/post faces, ideally, deep treated. Unseasoned timber should be installed between late Autumn and early spring.Cypress seasoned relatively quickly and is a relatively stable species. This species can be installed in the warmer months with a lot of care. The result just will not be as good.
Joinery- Cypress is not suitable for joinery unless it has been correctly seasoned to 10-12% moisture content.Allow for at least 50% waste for selection after seasoning, due to the cracking, bowing and loose knots. Seasoned supply is generally not available. Cypress Lead time- Some post sections are often in stock at the mill and available within 3-5 working days. Lead times are extending out to 6-8 weeks or longer as mills cannot keep up with demand. This year most cypress mills will stop taking orders mid- September. Orders placed after this time may start being processed late January.