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Decking Design and Cross-ventilation


The weekend has arrived and you’re all set to build your new deck.  However, a tradie friend did mention to you about “cross-ventilation” and you’re wondering if it’s really that important?  In one word, “YES!”  Your deck needs room to breathe.  Adequate air flow between deck boards assists in minimising moisture build up, mould and decay.  In fact, all decks require ventilation and this must be taken into account in the initial design of your deck.

All decking materials expand and contract over time.  For instance, when it’s hot and dry, timber contracts and when it’s humid and/or raining, timber expands.  When building your deck, ensure that air can flow freely through the deck and under the joists.  Cross-ventilation is produced when you allow for air flow through the gaps between the boards AND vents that have been placed in the horizontal area between the top of your boards and ground-level.  Proper ventilation enables moisture to evaporate evenly and consistently.

These days, a very common deck design is laying treated pine battens over a concrete slab.  It is so important to include vents in that one end horizontal board for the means of creating cross-ventilation for air flow.  Whether it’s this particular deck design or another featuring merbau, spotted gum or mahogany, don’t forget to add “cross-ventilation” to the very top of your To-Do-List.  For any further questions on cross-ventilation, please do not hesitate to contact No Nail Decking on 1300 733 559.

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