Choosing timber for simple indoor projects

Overview of Timber Types

When tackling simple indoor DIY projects—like building a small shelf, a planter box, or a basic desk—the choice of timber can make or break the result. Timber generally falls into three main categories for DIYers:

1. Softwood (e.g., Pine, Spruce, Fir): Softwoods are widely available, affordable, and easy to cut and screw into. They are ideal for hidden structural frames (like stud work) and rustic indoor furniture. However, they dent easily and can sometimes contain knots that complicate cutting or finishing.

2. Hardwood (e.g., Oak, Ash, Walnut): Hardwoods are significantly more durable and feature beautiful, tight grain patterns. They are best suited for high-quality, visible furniture where aesthetics and longevity are paramount. They are more expensive and harder to work with, often requiring sharp tools and pre-drilled pilot holes to avoid splitting.

3. Manufactured Boards (Plywood, MDF):

   • Plywood: Made of thin layers of wood veneer glued together, plywood is exceptionally strong and resists warping. It’s great for shelving, cabinet carcasses, and workbench tops.
   • MDF (Medium Density Fibreboard): Smooth and uniform, MDF has no grain, which means it won’t split. It is perfect for painted indoor projects like modern shelving or architraves. However, it creates fine, hazardous dust when cut and swells easily if exposed to moisture.

Matching the Material to the Job

• Painting the final piece? MDF or a clear-grade pine are excellent choices because they take paint well without grain textures showing through.
• Want a natural wood look? Oak or a high-quality birch plywood (with exposed edges) can provide a beautiful finish when oiled or varnished.
• Need strength over long spans? For shelves carrying heavy books, solid timber or thick plywood is required. MDF will sag over time if not adequately supported.

What to Check Before Buying

• Moisture Content: Timber bought from a cold, damp lumber yard will shrink and warp as it dries in a warm house. Ideally, buy the wood a week early and let it acclimatise in the room where it will be used.
• Straightness: Always sight down the edge of a board before buying it. Look for bowing (curving flatwise), twisting, or cupping.
• Knots: Avoid boards with loose or dead knots, especially on the edges where you plan to make cuts or drive screws.

Safety and Practical Tips

• Always wear a dust mask and eye protection when cutting or sanding timber. MDF dust is particularly fine and irritating.
• Work in a well-ventilated area, especially if applying finishes like varnish or oil.
• When screwing near the end of a board, always drill a pilot hole first to prevent the wood grain from splitting.