+ 1300 306 660 info@deckmax.com.au

What gap can I leave between the decking boards?

  • When determining the gap you require between the decking boards always think about the following:
    • What gap do I have under the deck for good air flow?
    • Is the timber Kiln Dried?
    • What is the moisture content of the decking?
    • What are the tolerances of the timber species you have chosen – how much will it move?
    • Am I in a fire rated zone that may have local council specifications for this setting?
    • How much will the Deck-Max™ biscuit take? – from a minimum of 3mm up to 7mm.
  • The traditional standard was approx. 4mm. To choose a 4mm gap simple insert a 4mm packer between the boards and set.
  • Let me give you an example – If I was to choose Merbau as a timber species and the moisture content of the decking was say 15% -  then my decision would be easy e.g. In Qld.. You can set Merbau at 3mm to 4mm as it will normally shrink over time But If I were to choose an Australian hardwood then the decision is based on Moisture content, was the timber kiln dried, Air flow under the deck – you would combine these questions and then determine the gap so any movement can be accommodated as some species will move more than others.
  • Remember timber will move throughout its life but you can control it withDeck-Max™ and the decisions you make when laying – It should be noted that most high quality hardwood / kiln dried boards will shrink in width and have minimal expansion. Always check with your local timber merchant for advise.
  • Firstly by choosing the Deck-Max™ Secret fixing you are so much better off because if the board does move then the decking will not crack or split.
  • Secondly be sure to have all the answers from your contractor before starting the project to be sure that your large investment will give you the long life and lifestyle of beautiful timber decking.
  • The batch of boards may vary in width due to the milling size of the boards (This causes what is referred to as feathering)  - you may need to vary this 3mm spacing a little, say every few boards so the deck is set evenly.
  • Your best option is to ask Deck-Max™ for recommended suppliers that will have the most accurate decking specifications.
  • When fitting to metal joists set spacing wider to accommodate the expansion and contraction of metal.