Timber decking is perfect for our Queensland climate, providing bridges between the indoors and outdoors and broadening our living and entertainment options at home.
It’s important to remember however, that outdoor decking is often at the mercy of the elements – and needs to be done right. Here are some guidelines and advice on how to construct and lay timber decking.
The first things to check when renovating a deck are the basic structural components such as the posts, bearers and joists on your verandah. If these need replacing, use a durable species such as ironbark or spotted gum. These species are generally supplied GOS (green off saw) because their shrinkage ratios are very low and it’s not really necessary to go to the added expense of kiln drying.
When ordering timber make sure to let the supplier know that it’s all for the one structure, so they can ensure the timber provided is all the same species. Different species acclimatise at varying rates which might lead to an uneven deck later.
Make the effort to prime the tops of the joists with an oil-based primer prior to laying the deck. This will protect the joists by reducing moisture uptake and lengthen the life of the verandah.
It stands to reason that work on the posts, bearers and joists is structural in nature, and it’s important to get it right. If in doubt, bring in an expert. Our business listings can help you find a builder. If the verandah is structurally sound, it’s time to start work on the decking itself.
If the deck will be exposed to the elements source a timber species such as ironbark, spotted gum or kwila. All of these species are extremely durable and will provide many years of service if well maintained. For less exposed areas treated pine or blackbutt can provide a more affordable decking solution.
Decking timbers have either two smooth faces or a grooved (or reeded) side and a smooth side. Grooved faces should be laid grooved side down to assist with ventilation under the deck and to reduce water uptake which will accelerate decay.
When laying the deck, it is important to space boards with an appropriate gap. Somewhere between 3mm and 5mm is recommended. Again, if the deck is exposed to the elements, increase the gap width slightly to speed up the drying process after rain. Decking tools are available which will ensure the gaps between boards are identical. Alternatively, place a suitably wide nail against the edge of the previously laid board before nailing down the next one.
The correct nail size is also very important - Finlayson’s recommend using a 50 x 2.8 galvanised or stainless steel bullet head (not zinc plated). Hand-nail the nails flush with the deck rather than using a nail punch. Nails should be kept 12mm from edges and ends of boards and boards should be pre-drilled (at 80% of the nail diameter) before nailing to avoid splitting.
Finally, stagger the nails for a smarter look. Staggered nails also reduce the likelihood of splitting the joists which can lead to water penetration.
Before getting started, why not join Finlayson’s Renovators Club? Members receive special deals on products and services and can attend helpful workshops and seminars.
