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DIY Building Supplies  |  SKU: JS-FBJR4775-2.4

3x2 Timber C16 Kiln Dried Regularised Joist 47x75mm

Length

£3.53 Ex VAT
£4.24 Inc VAT
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Our 3x2 Timber Joists are made from responsibly sourced timber, from FSC certified forests and are kiln dried for straightness and strength. Our 3x2 timber joists are 47x75mm in size (finished size approx 45x70mm) and available in lengths of 2.4m, 3m, 3.6m, 4.2m and 4.8m.

  • Kiln Dried for additional strength and durability
  • FSC Certified Timber
  • For use in interior projects
  • Regularised for uniform size, with eased corners
  • Graded to C16 strength grade
  • Conforms to BS 4978 and EN 14081:2006

What is 3x2 Timber in mm?

"3x2" represents the joist size in inches, equivalent to 47 x 75mm in metric measurements. However, due to regularisation in timber processing - ensuring uniformity along the joist's length - the "finished" size might be slightly smaller than the standard 47x75mm, often closer to 45mm x 70mm.

This slight size variance is minimal and typically inconsequential for the majority of projects. It's a standard characteristic of 47x75mm (3x2) timber joists.

What are 3x2 C16 Timber Joists Used For?

Commonly utilised in stud walling and partitioning, C16 timber has impressive strength, making it perfect for interior construction projects such as stud walling and partitioning, however it is not recommended for supporting a building's framework due to its size and strength grading. 

What is Regularised Timber?

Across our website, many of our timber joists are described as "regularised," indicating that the timber's length has been machine-finished to ensure a consistent smoothness, length, and width along the joist. This process might slightly alter the final size of the product by a few millimetres. The most common grades of regularised timber joists are C16 and C24.

What Does Kiln Dried Mean?

The process of kiln drying involves placing cut timber boards in kilns, subjecting them to continuous, even heat to remove excess moisture from the fresh timber. This rapid process reduces weight, increases strength and straightness, making the timber easier to work with. In contrast, air-drying timber joists can take several months to a year, making it a significantly slower method.

What Lengths Do 3x2 C24 Timber Joists Come in?

We stock treated and untreated 3x2 regularised timber joists in a range of sizes: 2.4m, 3m, 3.6m and 4.8m. While we aim to have all sizes in stock for delivery, there might be occasions where a longer length is substituted, such as if there's a delay or unavailability in your area.

What Does C16 Stand For?

In the UK, regularised timber is typically categorised into two grades: C16 or C24. The "C" designates the type of wood used (Conifer). The number indicates the strength grading - based on factors like imperfections, knots, etc., with C24 representing the stronger grade.

Usually, C16 timber joists find use in various wall and roofing applications, whereas C24 is reserved for high-strength needs such as roofing and flooring joists.

Do I Need Treated 3x2 Timber?

3x2 Timber C24 Regularised Sawn Joists are most commonly used for interior projects - if you project is likely to be exposed to moisture or insects, it is advised opt for 3x2 Treated Timber Joists

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    • Size
      3x2
    • Finished Size
      approx 45mm x 70mm
    • Thickness
      47mm
    • Length
      2.4m, 3m, 3.6m, 4.8m
    • Width
      75mm
    • Material
      Untreated Timber
    • Finish
      Untreated
    • Strength Grading
      C16
    • Chain of Custody Scheme
      FSC

    Large Order or Specific Requirement?

    CALL OUR TEAM

    0115 6976 800

    What is 3x2 Timber Used For?

    3x2 timber is most commonly used for framing, particularly in residential construction for wall studs and roof rafters where its relatively smaller size is suitable. It's also commonly employed in DIY projects such as garden structures due to its manageable dimensions and structural strength.

    What Types of 3x2 Timber Do You Offer?

    We offer a range of 3x2 timber - all suitable for structural applications, both treated and untreated.  As well as standard 3x2 timber, we also offer 3x2CLS timber, which although they are named similarly, has slightly smaller dimensions and is ideal for stud walls and partitioning. 

    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 Does CLS Stand For?

    CLS stands for “Canadian Lumber Standard” as it was originally sourced in Canada. Nowadays it is grown and sourced from various countries including grown here in the UK, but CLS is still used as a common name to identify the product. CLS is typically used for structural projects such as stud walls and partitioning, and is regularised on all sides, giving it a smaller profile than standard 3x2 timber by a few millimetres.

    3x2 Timber Dimensions

    Timber sizing can be confusing if you are not already familiar with it, but once you understand it is quite simple. “3x2” refers to the traditional way of measuring timber - in inches. In millimetres, this roughly translates to 47x75mm. However, as our structural timber is regularised - a process where each side of a length of timber is planed to achieve a uniform finish - in reality the dimensions are typically a few mm smaller than that - more like 45mm x 70mm. The exception is CLS timber, which is planed on all sides, making it’s dimensions a further few mm smaller - approx 38mmx63mm.

    Do I Need Treated 3x2 Timber?

    Our Treated 3x2 Timber is treated to UC2 and can be used in outdoor construction, though timber in direct contact with moisture may need further treatment. Our CLS and untreated 3x2 timber is more typically used indoors in the construction of timber frame structures, although treated timber can also be used, as it simply gives it additional resistance to moisture and pests.