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Northpine produces a range of machine stress graded structural products for civil, residential and commercial construction as well as a complementary range of outdoor products including decking and square posts. The structural products are available in SG8 but can be manufactured to SG10 and even SG12 by forward order. Packets of timber are available in various lengths (up to 7.2m) and treated to different hazard classes (up to H6) depending on intended use.
Northpine operates its own timber treatment plant on site - H1.2, H3.2, H4, H5 and H6 hazard classes. Other treatments can be arranged through external providers.
All products are manufactured from sustainably grown Radiata pine sourced from the north of New Zealand.
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A 1991 study conducted by the Forest Research Institute (FRI) demonstrated, in essence, that the further north in New Zealand the timber comes from, the denser and stronger it is. A further study by FRI in 1997 then showed conclusively that visual grading (ie using the NZ grading rules No1 Framing), gave different performance characteristics depending on which region the timber came from.
The result showed that out of the six regions tested, only two met the actual requirements that the visual grading was designed to achieve. One of these regions is Northland.
Density is closely related to timber stiffness and strength. Northland wood is in the highest density zone.
Source: Cowan, McConchie and Young (1991), FRI Bulletin 50.
The result showed that out of the six regions tested, only two met the actual requirements that the visual grading was designed to achieve. One of these regions is Northland.
Source: Cowan, McConchie and Young (1991), FRI Bulletin 50.
(mean density at 1.3m above ground). Northland wood is included in the
Auckland area, and is significantly higher than other areas.
Source: Cowan, McConchie and Young (1991), FRI Bulletin 50.
One study undertaken by the Forest Research Institute in 1997 took correctly graded No1 Framing timber from six mills around NZ (see map under Radiata Pine Growth Patterns) and, in conjunction with the bending strength and stiffness data, determined the characteristic bending strength and stiffness values.
The image below shows characteristic bending strength for this sample of 150x50 timber. Mill C (located in Northland) is consistently the highest rated producer.
In terms of bending stiffness there was a 4GPa difference across the country with 5 of the 6 mills achieving the No1 Framing grade value of 8GPa. In terms of bending strength only two mills achieved the No1 Framing grade target value of 17.7GPa. Mill C (in Northland) is the highest rated producer.
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