Installation Guidelines.

National Composites specializes in composite decking to suit all types of  residential and commercial properties. We offer quality decking and fencing solutions delivered to  any post code in Australia.

Our decking boards and materials are durable and have a natural resistance to rot, decay and splintering making it a great asset for your outdoor area. Available in wide choice of colours and finishes, our composite decking boards are manufactured using  the best materials available. 
Hidden Fixing
  • The National Composites boards are designed to be used with our ABS Plastic or  stainless steel hidden clipping systems. The clips will guarantee a consistent gap between the edges of the boards. Each floor joist requires 1 clip per board.​
Starter Board
  • The first board laid on your new deck is referred to as a starter board. National Composites "C" clips are used for starter boards. The "C" clip allows you to accommodate the required 5mm distance from the wall/structure.
Fascia
  • Using the National Composites fascia is an ideal way of finishing the edges of your new deck. Pre drilling of the fascia is required prior to fastening.
  • National Composites Fascia is available with a brushed finish in all decking colours. 
Double Joists
  • When joining boards using a Butt join, a double side by side joist MUST be installed. Fitting a clip on each joist.
Breaker Board
  • The breaker board method of joining is recommended on long spans instead of butt joining. Using a breaker board will allow for additional board movement. 

Installation on concrete
National Composites Decking can be installed with joists directly onto concrete. 
​Joining Clips supplied with either Timbertek or Metaltek screws. Please advise when ordering.
Gapping Requirements;

Between Boards - Side by Side. - 5mm
Board End to Solid Structure. - 10mm 
Against Wall - Parallel. - 10mm 
End to End Butt Join - Cold Day. - 7mm 
End to End Butt Join - Hot Day. - 5mm 
Butt Join to Breaker Board. - 5mm 


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Maximum Joist Distance 
Centre to Centre Must Not Exceed;

Hollow WPC  boards 
- 350mm.

Hollow CO-EXTRUDED boards 
- 400mm .

Solid ALL  boards  
- 450mm.
                                      
Please include  5% wastage for all orders
Storage
  • National Composites decking must be stored flat, off the ground on supports and under cover prior to installation.
  •  Decking can be installed using standard wood working tools. Guidelines must be followed to adhere to warranty requirements.
Only solid profile boards are suitable for commercial applications.
Please allow a fall on your deck to help prevent pooling and/or water staining.
Recommended  300mm clearance from ground level (soil) to prevent distortion and cupping.
Decking can be laid on concrete less than 300mm clearance if drainage is adequate.
Picture
Builders plastic can be installed under deck when clearance is less than 300mm. Please ensure area is free draining and well ventilated.