C16 & C24 Timber

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Shop our selection of kiln dried and regularised timber joists, graded to C16 or C24. Harvested from sustainable, FSC or PEFC managed sources. Nationwide* Delivery in 3-5 Working Days. Need something specific? Call us

What Does C16 / C24 Stand For?

In the UK, regularised timber is most commonly classified into two grades: C16 or C24. The "C" signifies the wood type, specifically Conifer. The number (24/16) indicates the bend strength - which is based on factors such as imperfections and knots. While C24 is the stronger grade, C16 remains exceptionally strong and is used in numerous wall and roofing applications.

What sizes of C16 and C24 Timber Do You Offer?

We offer a variety of structural and graded timber - from small 3x2 sizes to larger 8x2 timber. We also offer CLS Timber that is typically graded to C16. Our C16 and C24 timber is available in a range of lengths from 2.4m - 4.8m, most commonly 2.4m, 3m, 3.6m, 4.2m and 4.8m.

What is Regularised Timber?

Our timber joists are often referred to as “regularised” - meaning the lengths of timber are machine-finished to achieve a smooth finish and a uniform dimensions along the length of the timber joist. This can impact the finished size of the product by a few millimetres. The most common types of regularised timber joists are C16 and C24.

What Does Kiln Dried Mean?

Timber that is kiln dried is  placed in kilns where a consistent heat removes excess moisture from freshly cut boards, reducing weight, enhances strength and straightness, and improves its workability. Rather than using an air-drying process that can take several months to a year, kiln drying is a faster and more reliable method.

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