BEARERS, BEAMS, RAFTERS, JOISTS AND FASCIASolid (not laminated) timber
P.N.G village harvest Rosewood
Native white Cypress
Bearers, beams, joists, rafters, facia, handrails-
SOLID Merbau- Stamped F27 k/d – 90x45 140x45 190x45 240x45 290x45- 90x35 140x35 190x35. Or f17 a/d (seasoning) dpr 115x65 150x75 200x75 250x75 300x75 -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 100x50 150x50 200x50 250x50 – 200x75- 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 200x50 to 200x75mm. Sizing should be increased in depth over thickness. 200x50 to 250x50
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.