Installation
Get it right the first time
UltraDeck installs with standard decking tools. Follow these fundamentals and your deck will stay flat, quiet and true for decades.
1. Frame and joist spacing
Space joists at a maximum of 450mm centres for residential decks, or 350mm for commercial and diagonal layouts. The frame must be flat, level and well ventilated.
2. Allow for ventilation
Leave a minimum 25mm air gap beneath the boards and keep both ends of the sub-floor open so air can move. Poor ventilation is the most common cause of movement.
3. Expansion gaps
Composite expands and contracts with temperature. Leave 5–8mm end gaps between boards, and 10mm where boards meet a fixed structure such as a wall or post.
4. Hidden fixing system
Use the UltraDeck hidden fixing kit for a clean, screw-free surface. Clips set consistent side gaps automatically. Face-fixing with composite screws is also supported.
5. Finishing and care
Trim board ends square and finish edges with a fascia board. No oil, stain or sealer — just wash with warm soapy water and a soft brush as needed.