Weatherboard Cladding

Installation Procedure

Australian cypress (Callitris Glauca) timber is a "natural" material and is subject to dimensional movement with change in seasonal conditions. Whilst Weatherboard Cladding is kiln dried (approx. 18%), the following points should be observed to assist installation.


Ensure suitable on-site storage location is available before delivery. All cladding should be protected from the elements during loading, transportation and unloading. Store under cover protected from the elements, direct sun and where the atmospheric moisture content is similar to the level expected on your building. Timber packs should be stored at least 50mm off the ground/concrete, with even supports to maintain straight boards and to allow good ventilation to all pack faces. Keep packs strapped until ready for use.
Weatherboards come wrapped in plastic for transport and minimal on-site storage and should not be exposed to direct sun as this limits air circulation and may cause sweating. Do not store on fresh concrete floor as timber will absorb this moisture.



  • Where cladding is to be finished with a surface coating, each board must be fully coated (front, back and sides including docked ends). Additional coats should be applied after installation to paint manufacturers recommendations.
  • A SARKING or VAPOUR BARRIER must be used behind timber cladding to direct water, (that may have penetrated the cladding) back to the outside. Sarking must be weather proof but also vapour permeable (ie: not perforated or absorbent type). Install to manufacturers recommendations. Adequate flashings must be provided at corners, around openings and also wall plates to assist in moisture management.
  • It is "good practice" and is recommended that the barrier separating the exterior cladding should form a minimum 20mm vented cavity. This allows for the drainage of any moisture that has penetrated the exterior cladding or condensation that may form on the rear face of the cladding. Refer to Fig. 1 or 2.
  • Splayed and Rusticated Weatherboards are supplied kiln dried to approximately 18% and are available as sawn or dressed face.
  • If using a dressed product, the presence of mill glaze needs to be considered. Refer to: Finishes on our website.
  • All ends and joints in boards should be pre-drilled prior to nailing and should be located behind a framing member.
  • Splayed and Rusticated Weatherboards are designed to be face nailed or screwed at support centres ranging from 400mm to 600mm, depending on wind zone. Refer to Fig. 1 or 2.
  • Sawn face weatherboards can be left untreated to weather naturally to a "silver-grey", however, to assist in prolonging the service life, a quality coating or pre-treatment can be applied.
  • Dressed faced weatherboards, used externally should be finished with a quality coating and maintained. Failure to do so will result in surface checking and reduced service life. For more information refer to: Finishes on our website.




Screw fixing is recommended as experience has shown that over time, nails can 'work out' of the face of the cladding.

Fixings should be chosen for their corrosion resistance to suit the environment in which they are to be used.

Fixing types


Hot-dipped galvanized or stainless steel nails arerecommended. Generally, nails should have a length of no less than three times the board thickness being fixed. As Cypress is extremely dense and tight grained care is needed when nailing as some splitting can occur. Where possible use blunt or shear point nails or alternatively remove the points of gun nails to approximately half of the point length by grinding, prior to installation. This will reduce the likelihood of splitting the board. For hand nailing, a better result is achieved when the nail points are blunted slightly with a hammer prior to nailing. Alternatively, holes can be pre-drilled. Pre-drill boards slightly smaller in diameter (80%) than the nail when nailing less than 50mm from board ends.

Weatherboard - 15 to 20mm sawn and dressed face.

Framing - Cypress or Hardwood
Gun nailing - 50 x 2.8mm helical shank, flat/domed head
Hand nailing - 50 x 2.8mm plain shank

Framing - Softwood
Gun nailing - 50 x 2.8mm ring shank, flat/domed head
Hand nailing - 65 x 2.8mm plain shank

Use a min 7 gauge x 50mm type 17, square drive screw in pre-drilled holes.




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