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Essential Guide to Timber Merchant Terminology Explained

Imagine you're planning to renovate your garden and you're eager to take on a DIY project. You step into a timber merchant's yard, ready to purchase the materials you need, but quickly find yourself puzzled by the array of timber options and terminology. That's where our essential guide comes in handy, simplifying the jargon and helping you make informed decisions. Whether you're a novice or have some experience, understanding timber merchant terminology is crucial.

Understanding Timber Types

Softwood vs. Hardwood

25x125 Tanalised Treated Overlap Shadowboard

One of the first distinctions you'll encounter is between softwood and hardwood. Softwood types, such as pine and spruce, come from coniferous trees. They grow faster, making them more generally affordable and sustainable due to easier replenishment. Hardwoods, like oak and mahogany, are denser and come from deciduous trees, ideal for high-quality furniture and flooring. Their strength and durability often come at a higher price, but the end-product value can be worth it.

For those starting with a basic garden project, softwoods might be the preferred choice. The affordability and ease of workability make them ideal for things like fencing and garden structures.

Explore our Tanalised Treated Overlap Shadowboard here.

Tanalised Timber

2x2 (50x50) Tanalised Framing

You've probably heard the term "tanalised" when looking at decking or fencing. This process involves pressure-treating the wood with preservatives, protecting it against rot, decay, and insect infestation. It's a must for any timber exposed to outdoor conditions.

Consider our 2x2 Tanalised Framing for robust and long-lasting structures.

OSB and Plywood

Hardwood Faced Plywood - 8x4ft Sheets - 15mm

When constructing walls or roofing, choosing the right board material is essential. OSB (Oriented Strand Board) is comprised of compressed wood strands, leading to uniform strength suitable for load-bearing constructions. Plywood, on the other hand, consists of layers of wood veneer, offering flexibility and a higher-grade finish. Our Hardwood Faced Plywood provides an excellent aesthetic finish.

Check out our 8x4 OSB Sheets for cost-effective underlayment solutions.

Timber Measurements

Dimensions and Sizing

Timber is often sold in imperial measurements, such as 2x4, which can confuse those accustomed to metric. A 2x4, which reads two inches by four inches, is commonly used in framing due to its versatility. When purchasing timber, it's also crucial to be aware of shrinkage, as wood slightly shrinks once dried.

Coverage and Thickness

When selecting cladding or sheathing materials, the thickness and coverage are key considerations. Thicker boards can span larger spaces with less flex but are also heavier and more expensive. Coverage details will help you determine how much material you need, ensuring seamless installation and minimising waste.

Treatment and Grading

Timber Treatments

Untreated vs. Treated

Polyester Shed Roofing Felt - Charcoal Mineral - 10m x 1m

Untreated timber is more vulnerable to the elements and requires additional protective measures, while treated timber has undergone processes to enhance durability. Our Polyester Shed Roofing Felt in Charcoal Mineral finish ensures your outdoor structures remain dry and secure in adverse weather. Discover more here.

Timber Grading

Grading specifies the quality regarding knots, splits, and grains. Commonly, visual grading and machine grading are used, with higher grades (e.g., C24) indicating strong, high-quality timber fit for structural use. It's vital to select the right grade based on your project needs.

Delivery and Installation

When you've selected your materials, the next steps include the method of delivery and installation. Timber typically requires a flat, dry storage area upon delivery to prevent warping and moisture damage. Services may vary, so always verify if your supplier offers specific delivery options or requires extra charges.

Consider using our installation services to ensure flawless completion of your project.

Unique Selling Points of Timber Products

Investing in quality timber products can redefine your home improvement projects:

  • Sustainability: Timber stands out as a renewable resource, especially when it comes with a FSC certification, giving you peace of mind about the eco-return on your purchases.
  • Versatility: With numerous finishing options, timber allows unmatched personalisation.
  • Aesthetics: Natural beauty and warmth of wood can add both aesthetic and financial value to any home.

Ready to get started with your garden project? Visit TimberDIY for all your timber needs, from plywood and OSB options to tanalised timber framing.


Exploring the timber terminology equips you to confidently tackle DIY projects, ensuring you not only pick the right materials but also understand their treatment, measurements, and sustainable profits. Whether you're building a shed, planning a fence, or simply refurbishing, selecting the right timber can transform your vision into reality. Happy building!

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