This will also reduce the size of the timber as the edges are worn down to create a flat surface. Planing (sanding to a clean, flat surface) timber is not a necessity but will be needed in all visible timber, such as floorboards and window frames. Almost all timber used within buildings will have been dried first, with high moisture content causing a suite of issues. Kiln-drying will shrink the size of timber, as excess moisture is removed. Within the timber industry, the vast majority of timber will be dried and planed before being sold. Rough sawn green timber is not commonly used within buildings due to its high water content. When timber is freshly cut it is known as “green timber” and will be at the nominal sizes stated. When looking at timber sizes it’s important to understand the distinction between nominal and actual sizing. The lengths that timber beams come in can vary dramatically, but standard lengths tend to escalate in 60cm increments, with our range including 2.4m, 3m, 3.6m, 4.2m, and 4.8m lengths. ![]() For joists, a 50mm by 100mm batten will commonly be used. Our planed timber (PSE) starts at much smaller standard sizes, with 25mm x 25mm (1x1) beams available, which are suited for more decorative uses. When using C16 or C24 structural timber for carcassing work, a thicker beam will be essential for load-bearing supports. For instance, our range of CLS timber sizes starts at 50mm x 75mm (2x3), while our structural timber starts at 47mm x 100mm (2x4) and goes all the way up to 75mm x 225mm (3x9). Within this you’ll find smaller sizes that are perfect for use within fine or decorative projects, as well as thicker lengths that would be used within building framing, or as floorboards. Below are the approximate metric equivalents of the most popular timber sizes: Imperial Height and Width (Inches) Across the world, and informally in the UK, imperial sizes continue to be used. Within the UK all timber must be sold in metric sizes, with millimetres the common unit. ![]() We’ll also look at the crucial difference between nominal and actual sizes – an important thing to consider when ordering timber. In this guide from Building Materials Nationwide we’ll examine the common timber sizes within the UK, comparing these to the commonly used imperial measurements. Timber is sold in a wide array of sizes within the UK, for use in everything from building frames to the legs of a chest of drawers.
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