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BEARERS, BEAMS, RAFTERS, JOISTS AND FASCIA

Solid (not laminated) timber

P.N.G village harvest Rosewood

Merbau

Native white Cypress

Spotted gum

Kwila (merbau)

Bearers, beams, joists, rafters, facia, handrails-

SOLID Merbau- Stamped F27 k/d – 90×45 140×45 190×45 240×45 290×45- 90×35 140×35 190×35. Or f17 a/d (seasoning) dpr 115×65 150×75 200×75 250×75 300×75 -Lengths up to 6.3m may be available on order. Other sections are available.

Blackbutt and spotted gum in kiln dried F27 structural grade- to order

Native Cypress- unseasoned, sawn f7 100×50 150×50 200×50 250×50 – 200×75- other sections on order. Machined finish DAR to order

Unseasoned hardwood – to order -to specification supplied.

Posts to match- see Posts page.

– Unseasoned timber -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 may not help e.g going from 200×50 to 200x75mm. Sizing should be increased in depth over thickness. 200×50 to 250×50

Span tables– It is better to over- engineer when using unseasoned, structurally graded timber  due to potential sag– see above. Sapwood percentage may be a factor.

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. 

Acclimatizing unseasoned hardwoods – All cut ends should be sealed with  log- end sealer to reduce cracking and board/post faces, ideally, deep treated with an oil based penetrant . Unseasoned timber should be installed between late Autumn and early spring.