Understanding Materials: Wood, Screws, Nails, and Glue
Before you build anything, you need to understand what you're building with. Different materials have different properties — strength, weight, workability, cost — and choosing the right material for the job is as important as the build itself.
Wood: The Beginner's Best Friend
Softwood
Pine, radiata, and similar. Light, easy to cut and work, affordable. Most construction timber in Australia is radiata pine. Great for beginner projects.
Hardwood
Eucalyptus, jarrah, blackbutt. Harder, heavier, more durable, more expensive. Harder to cut and work by hand. Used for outdoor structures, furniture, and flooring.
Plywood
Thin layers of wood glued together with alternating grain directions. Strong, stable, and available in sheets. Great for shelves, boxes, and larger flat surfaces.
MDF (Medium Density Fibreboard)
Compressed wood fibres. Smooth surface, easy to paint. Not water-resistant. Good for indoor shelves and simple furniture. Warning: MDF dust is harmful — always wear a dust mask when cutting or sanding.
Fasteners
Nails
Quick and easy. Good for rough construction and temporary fixing. Types: bullet head (general), panel pins (thin, for trim), clouts (wide head, for sheet materials).
Screws
Stronger than nails and removable. Self-tapping screws (sharp point) are best for wood. Pre-drill near edges to prevent splitting.
Wood Glue (PVA)
Surprisingly strong — a properly glued joint can be stronger than the wood itself. Apply to both surfaces, clamp for 30 minutes minimum. Full strength after 24 hours.
Bolts
For heavy-duty connections. Bolt through both pieces and tighten with a nut. Use washers to spread the load.
Buying Timber
Timber is sold by its nominal dimensions (e.g., "90 × 45mm"), but actual dimensions are slightly smaller after planing. Standard lengths are 1.2m, 1.8m, 2.4m, 3.0m, etc. Bunnings and timber yards will cut to length if you ask.
Check for: straightness (sight along the edge), knots (weak points), and moisture (warped or wet timber will move as it dries).
Tonight's Question
"Look at the furniture around us. Can you tell what each piece is made from — solid wood, plywood, MDF, or something else? How can you tell?"
Material Investigation
- Visit a hardware store (Bunnings, local timber yard) together.
- Handle different types of timber: pine, hardwood, plywood, MDF.
- Feel the difference in weight, hardness, and texture.
- Compare prices per metre for different materials.
- Look at screws, nails, and bolts. Understand the different types.
- Ask staff questions — they're usually happy to help beginners.
Go Further
- Research: Where does Australian timber come from? Is it sustainably sourced? Look for FSC certification.
- Experiment: Test the strength of nails vs screws vs glue by joining scrap wood each way and trying to pull them apart.
- Book: The Complete Manual of Woodworking by Albert Jackson & David Day (1989) — comprehensive reference.
- Question: Why is wood one of the most sustainable building materials available?
What We Simplified
- There are many more materials. Metal, plastic, composites, concrete — each has its place. We focused on wood as the most accessible for beginners.
- Timber grades and treatments matter. Treated pine is required for outdoor use (to prevent rot). Different grades suit different structural applications.
- Sustainability is complex. Plantation timber is generally sustainable. Old-growth logging is not. Understanding the difference matters.
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