Specifications for Glue Laminated Timber NZ
Design of structural timber shall be carried out by McIntosh Timber Laminates Ltd using a specialist registered engineer who can demonstrate competence in the design of timber structures in the relevant market place.
The Service Class defines the environmental conditions in which the laminated beams may be used.
The adhesive used in fabrication shall be Type II (such as melamine fortified urea) for Service Class 1 & 2 (interior use) and Type I (such as unmodified resorcinol) for Service Class 3 (exterior use). Adhesive components shall be stored, mixed, handled, spread and cured in accordance with the adhesive manufacturer's instructions.
Fabrication shall be in accordance with recognised sound practice, using adequate plant and equipment under the supervision of qualified personnel and shall comply with the recommendations of ASNZS 1328.
Laminations shall be planed within 48 hours prior to gluing. The variation in thickness over the entire lamination shall not exceed 0.5mm.
Laminations shall be pre-glued to the full length required. All end joints in laminations shall be structural finger joints complying with the requirements of AS5068. Concentrations of end joints shall be avoided. End joints shall, as a minimum, be dispersed so as to avoid stacking of joints. The average distance between finger joints in the same lamination shall be approximately 2.0m
It is especially important that machining of laminations be precise, glue spread adequate and uniform and clamping sequences and pressures correct.
Appearance of Finished Members
All connection hardware shall be prefitted where possible with end-cutting and slotting being carried out in the factory.
Protection of Finished Members
Quality Control Testing During Manufacture.
The manufacturer shall supply the results of routine tests done in compliance with requirements for checking glue quality and laminate end-joint strength
NOTE:Use webbing slings for lifting to avoid damaging Glulam members. Where chains or wire ropes are necessary adequate corner protection must be used. Glulam should be lifted on its edge wherever possible with a suitable spreader used on long members. Locate slings carefully to ensure balanced support and control the Glulam with guy lines when lifting.
The specialist Contractor shall supply an erection supervisor to oversee the installation of the laminated timber structures. A suitable erection method shall be proposed by the installer. Cranage, scaffolding and erection equipment shall be provided by the Main Contractor.
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