Installing a timber deck is one of the most rewarding ways to enhance outdoor living spaces. Getting it right requires good foundations, the right fasteners, ventilation, and ongoing maintenance to ensure the deck stands strong for years to come.
Start with the Framing
When building a deck, especially one close to the ground, choosing the right framing is critical. Woodhouse TerraFrame® is a standout option for subframes and decking foundations. Treated with Micronized Copper Azole (MCA), it’s resistant to rot, fungal decay, and termites - perfect for high-moisture environments. Unlike H3 treated pine, TerraFrame® is rated H4, meaning it can be used in direct ground contact - giving you more flexibility in design and placement.
Beyond durability, TerraFrame® is also sustainable. Made from FSC®-certified Radiata pine, it’s kiln-dried and coated with a proprietary water-based oil that helps prevent moisture uptake after installation. Graded to MGP10 and backed by a 50-year guarantee, it’s a timber you can trust for long-term performance.
Don’t forget, good ventilation and drainage are critical to ensure timber performs well and doesn’t cup or warp - timber boards should generally be minimum 300mm from the ground. If you are installing a timber deck lower than 300mmm, best practice is to utilise narrower decking boards (64-90mm in width), along with an 8mm gap between boards to assist with airflow.
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Screws Matter More Than You Think
Fasteners can often be underestimated, but they’re the backbone of any solid deck. Using the wrong screw can lead to loose boards, corrosion, or even structural failure. For timber decking, coarse-thread screws are ideal - they grip the wood better and reduce the risk of splitting. Stainless steel or galvanised screws are a must for outdoor projects, offering superior resistance to rust and weathering. Screw head types also play a role in both performance and aesthetics. Countersunk and flat heads are popular for decking because they sit flush with the timber, creating a nice, clean finish.
When selecting screws, always consider the gauge and length, and follow manufacturer guidelines. For compliance and safety, refer to the National Construction Code (NCC) and relevant Australian Standards like AS 1684.2:2010 for timber-framed construction.
Timber decking screws available at NHS (by application):
| Timber Decking to Steel Joists | Hardwood Decking to Hardwood Joists |
| Wide Decking Boards | Hardwood Decking to Treated Pine Joists |
Tips for a Long-Lasting Deck
Proper installation starts with planning. Ensure your subframe is level and well-supported, with good drainage and ventilation, especially for low-to-ground decks. Use correct screw spacing to avoid timber movement and ensure a secure hold. Self-drilling screws can save time, especially when working with metal brackets or joist hangers, while self-tapping screws are better suited for timber but require a pilot hole.
Once decks are installed, don’t forget about maintenance. Explaining maintenance to the homeowner is key to ensuring the longevity of a timber deck. Timber is a living material - it expands, contracts, and weathers over time, regular inspections are key, even on the underside of the deck. Check that the protective coating is still repelling water and that the finish hasn’t worn down. If it no longer repels water - you will need to clean the surface with a timber cleaner, then reapply a protective finish. NHS stocks both Intergrain and Cutek decking cleaners and oils including:
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Build with Confidence
Whether you're building a new deck or upgrading an old one, the right materials and techniques make all the difference. For expert advice around decking prep, care, and maintenance visit NHS at one of our three locations.