Deck Substrates & Framing
The performance and longevity of any composite or timber deck starts with what’s underneath it. Master Woodturning supplies a complete range of structural substrates and framing systems to suit every project type and ground condition. Our H3 treated pine joists provide reliable, cost-effective framing for standard above-ground deck builds. For ground-level and in-ground-contact applications, our LowDeck H4 treated substrate is engineered to GL8 structural grade and protected with Koppers Micro timber treatment technology, backed by a 50-year treatment warranty against fungal decay, termites, and insect attack. Where steel or aluminium framing is preferred, the Clickdeck aluminium substrate system offers a lightweight, corrosion-resistant alternative that delivers perfectly level, fast-install framing with no warping or twisting over time. For projects in designated bushfire areas, our FlameFixx BAL-40 rated substrate provides a compliant structural base.
FREQUENTLY ASKED QUESTIONS
Why does the substrate and framing matter so much?
The frame is the foundation of your deck, its strength, level, and longevity all depend on what's underneath. Even the best decking boards will fail early if the substructure warps, twists, or rots. Choosing the right framing system for your ground conditions and project type is the single most important step in building a deck that lasts.
Which framing system should I choose?
It depends on your build. H3 treated pine joists are a reliable, cost-effective choice for standard above-ground decks. For ground level or in ground contact builds, LowDeck H4 treated substrate is engineered for that exposure. If you want a perfectly level, long lasting frame with no timber movement, the Clickdeck aluminium system is ideal. And for bushfire prone sites, FlameFixx BAL-40 provides a compliant base. We're happy to help match a system to your project.
What's the difference between H3 and H4 treated timber?
The "H" rating indicates the level of protection against decay and insect attack. H3 is designed for outdoor use above ground, where timber is exposed to weather but not in constant contact with the ground, perfect for standard elevated deck framing. H4 is rated for ground contact and in ground applications, where moisture exposure is far greater, making it suitable for ground level and low set decks.
What makes LowDeck H4 substrate different?
LowDeck is engineered to GL8 structural grade and protected with Koppers Micro timber treatment technology. It's built specifically for ground level and in ground contact applications, and it's backed by a 50-year treatment warranty against fungal decay, termites, and insect attack, giving you long term confidence in the most demanding conditions.
Why choose the Clickdeck aluminium system over timber framing?
Aluminium framing is lightweight, corrosion resistant, and completely dimensionally stable, it won't warp, twist, cup, or rot the way timber can over time. The Clickdeck system delivers a perfectly level base and installs fast, making it an excellent low-maintenance choice for decks where a flawless, long lasting frame is a priority.
Can aluminium framing be used under both composite and timber decks?
Yes. The Clickdeck aluminium substrate provides a stable, level structural base suitable for a range of decking surfaces. Its resistance to movement makes it especially well suited to composite boards, which perform best on a true, consistent frame.
Do you supply framing for both ground-level and elevated decks?
Yes. We stock a complete range of substrates and framing systems to suit every project type and ground condition from H3 pine for standard above ground builds, to H4 LowDeck for ground and in ground contact, through to aluminium and bushfire rated options. Whatever the site, there's a suitable system available.