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Processing Factory for Kanuka Engineered Wood Products Ltd.

The design is a modern twist on a huge 60m clear span bow string truss in glue laminated timber with nail plate connections. The solution required extensive collaboration between designer, builder and manufacturer, and is impressive for its size made from relatively small pieces.

The processing factory for Hastings firm Kanuka Engineered Wood Products is the result of collaboration between manufacturer Peter Roil and engineer Garry Newton of Structural Concepts Limited.  At 60 metres wide with no internal supports, and made primarily from laminated timber, the building is a feat of innovative engineering designed to showcase the same product manufactured within.

Integral to the design are the large roof trusses which make up the majority of the 300 cubic metres of Pinus Radiata laminated wood used in the building.  For added strength, the bottom chords of the trusses have been laminated with Douglas Fir.  One of the many benefits of trusses is the ability to cover the required building width using smaller pieces of timber.  In line with this need, the purlin span in the roof framing has been divided using an intermediate beam.  The gravity load of the trusses has allowed for smaller columns, at a width of just 575 millimetres.  Metal components in the shed have been kept to a minimum, with timber used for the framing and the majority of the building.

The success of this building is a credit to engineer Garry Newton who has risen to the challenge of designing such a structure.  Among his innovations are the use of nails and cleats for every connection, bar the brace bays.  The exclusion of bolts in favour of nails means less slippage and reduced costs.

The use of timber has enabled every part of the process to remain within Hawkes Bay, making it both cost effective and more sustainable.  As well as being a renewable product, laminated timber has a greater fire resistance than steel, which tends to buckle in high temperatures, compared to the beams which simply char.  Manufacturer Peter Roil hopes others in the construction industry will look to this design as a model for future buildings.