47mm x 125mm (5 x 2) - Sawn Kiln Dried & Regularised C24 Graded Timber

47mm x 125mm (5 x 2) Sawn Kiln Dried & Regularised C24 Graded Timber is a high-strength structural carcassing timber designed for construction projects where increased load capacity and longer spans are required. Strength graded to C24, this timber offers superior structural performance compared to standard C16 and CLS timber.

C24 carcassing timber is kiln dried to 20% moisture content or less, helping improve straightness, dimensional stability, and overall performance in line with UK building regulations. Stress grading is carried out either at source to BS 4978 or visually by qualified stress graders, ensuring reliable and consistent structural strength.

This timber is regularised, meaning it has been planed all round for consistent sizing and easier installation. Regularised timber typically finishes 2mm off nominal thickness and 5mm off nominal width, with eased (rounded) corners for safer handling and improved fixing accuracy. A nominal 47mm x 125mm section finishes at approximately 45mm x 120mm.

Typical uses for 47mm x 125mm (5 x 2) C24 timber include:

• Floor joists for medium spans (subject to structural design)

• Roof rafters and ceiling joists

• Decking joists and raised deck subframes

• Load-bearing stud walls and partitions

• General structural framing where higher strength than 4×2 is required

This size is commonly chosen where additional stiffness and span capability are needed without moving up to heavier 6×2 sections.

Although timber sizes are listed in metric to comply with UK retail standards, imperial equivalents are shown for ease of identification. Always use metric measurements when setting out and installing.

How does 5 x 2 C24 compare to C16 or CLS timber?

• Most CLS timber in the UK is graded at C16

• C16 and C24 are the most common strength-graded timbers

• C24 is graded to a higher standard than C16

• C24 timber comes from slower-grown timber with a tighter grain

• C24 is approximately 50% stronger than C16

• Better suited to longer spans and heavier loads than CLS or C16

Nominal size: 47mm x 125mm (5 x 2)
Finished size: approximately 45mm x 120mm
Grade: C24 strength graded
Condition: Kiln dried & regularised
Use: Structural carcassing timber