Installation Procedure for

DESIGNADECK_LOGO.GIF

Australian cypress (Callitris Glauca) like all timbers is a "natural" material and is subject to dimensional movement with change in seasonal conditions. Whilst designAdeck is kiln dried (approx. 14%) to minimize movement, the following points should be observed to assist installation.

 
TRANSPORT AND ON-SITE STORAGE

Ensure suitable on-site storage location is available before delivery. All designAdeck 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. designAdeck comes 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.

 
IF UNSURE PLEASE CONTACT US

www.frencham.com.au

Ph. 03 5245 8004

 
PRODUCT INFORMATION

Our standard designAdeck boards are:
 

  • 90mm wide x 20mm thick
     
  • 90mm wide x 26mm thick
     

All of our designAdeck range is available as either a dressed or sawn upper face. A dressed face reveals cypress rich colour and distinctive dark knots, whilst a sawn face gives a more uniformcolouring with the knots tending to fade into the background.

All designAdeck boards are kiln dried, with a pencil round to all 4corners, to reduce splintering and enhance the performance ofcoating.

We do not reed our decking, as this allows for the 'best' face to be chosen and is regularly used in fence/screening applications.

Cypress designAdeck boards may contain limited amounts of sapwood. Sapwood boards should be installed downwards and towards an eaves or roof projections.

(Sapwood is the lighter, creamy coloured part of some cypress decking boards). Experience has shown that cypress decking boards with a sawn upper face provides a greater long term weathering ability, a better surface 'key' for coatings, and is less prone to surface checking than dressed face boards.

 
INSTALLATION

  • designAdeck is supplied kiln dried to approximately 14%. Seasoned decking boards should be spaced with a 4mm to 6mm gap. (This may vary for 'wide' board widths).
     
  • Cypress is naturally durable due to its high oil/resin content, however there is no leaching of tannins, hence no staining of concrete, brickwork, etc.
     
  • For face fixing and to reduce splitting, all designAdeck should be pre-drilled prior to fixing, with particular attention paid to ends and joins. Fixings should be kept a minimum of 12mm from edges and ends. refer to Fig 1.
     
  • All joints should be located over a framing member. Butt joints in boards should be staggered and undercut for tight fit. refer to Fig 1.
     
  • Where fixing occurs other than at the ends of the board, screws/nails should be staggered across the joint to reduce shrinkage cracks accruing in the framing. refer to Fig 2.
     
  • Each board should be fixed at each joist with two screws/nails which should be finished flush with the top of the boards (rather than punched) to prevent moisture being trapped. refer to Fig 3.
     
  • It is recommended that tops of joists/ bearers be flashed with a proprietary deck capping or a strip of malthoid, to assist in prolonging the service life of the decking and framing. refer to Fig 1 & 3.
     
  • designAdeck boards are designed to be fixed at support centres ranging from 450mm to 650mm, depending on board width and thickness.
     
  • Joints should be designed to minimize moisture entrapment, using self-draining joints and flashings. Pre-coating and end sealing should be used to minimize checking and moisture up-take in joints.
     
  • Australian Cypress can be left untreated to weather naturally to a "silver-grey", however to give a more "even greying" and assist in prolonging the service life of the designAdeck, a quality pre-treatment should be applied. refer to: Finishes on our website. 
     
  • Where decking boards are to be finished with a surface coating, it is recommended that each board be fully coated, including docked ends. For more information, refer to: Finishes on our website.
     
  • Where designAdeck is not to have a surface coating, it is recommended that the cut ends be sealed (eg. "Logshield clear" or clear penetrating coating) to reduce end checking. 
     
  • Dressed designAdeck, 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.
     
  • If using dressed designAdeck, the presence of mill glaze needs to be considered. refer to: Finishes on our website.

 DESIGNADECK_FIGURE1.PNGDESIGNADECK_FIGURE2-3.PNG

 
FIXING RECOMMENDATIONS

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

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

designAdeck - 20mm
Screws

Use a min 7 gauge x 50mm type 17, square drive screw in pre-drilled holes.
Nails
Framing - Cypress or Hardwood  
Gun nailing - 50 x 2.8mm helical shank, flat/domed head
Hand nailing - 60 x 2.8mm plain shank
Framing - Softwood
Gun nailing - 50 x 2.8mm ring shank, flat/domed head
Hand nailing - 60 x 2.8mm plain shank

designAdeck - 26mm
Screws

Use a min 7 gauge x 65mm type 17, square drive screw in pre-drilled holes.
Nails
Framing - Cypress or Hardwood  
Gun nailing - 65 x 2.8mm helical shank, flat/domed head
Hand nailing - 65 x 2.8mm plain shank
Framing - Softwood
Gun nailing - 65 x 2.8mm ring shank, flat/domed head
Hand nailing - 65 x 2.8mm plain shank

 
HINTS ON FIXING

Whilst a conifer species (softwood), Cypress properties relate more closely to those of a hardwood. It has an extremely dense and tight grain, hence care needs to be taken when fixing, as some splitting can occur.

  • When nailing, blunt shear or chisel point nails should be used wherever possible. This type of nail is generally available for 'Finish' and 'Framing' nail guns.
     
  • Where a nail gun is to be used and blunt, shear or chisel point nails are not available, removing the points of the nail to approximately half of the point length with a grinder or belt sander prior to installation, will reduce the likelihood of splitting.
     
  • For hand nailing, better results are achieved when the nail points are blunted slightly, with a hammer prior to nailing. For best results, nail holes should be pre-drilled to 80% of the diameter of the nail, particularly when nailing close to ends.
     
  • All screw fixings should be pre-drilled to the root diameter of the screws to be used. For larger diameter screws the application of a small amount of water-proof grease can greatly assist in the installation and durability of the fixing.

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