47mm x 75mm (3 x 2) - Sawn Kiln Dried & Pressure Treated (Tanalised) C24 Graded Timber

47mm x 75mm (3 x 2) Sawn Kiln Dried & Pressure Treated (Tanalised) C24 Graded Timber is a strong, versatile structural softwood section combining C24 strength grading, kiln drying, and pressure treatment for enhanced durability and reliable performance.

C24 carcassing timber is kiln dried and strength graded to C24 standards, providing known structural performance for demanding construction and framing applications. Stress grading is carried out either in the country of origin to BS 4978 or visually graded at the sawmill by qualified stress graders.

Kiln drying to 20% moisture content or less improves stability, straightness, and reduces movement once installed, helping meet current building regulation requirements.

This timber is regularised (planed all round) for consistent sizing, typically finishing approximately 2mm off nominal thickness and 5mm off nominal width. For example, a 47mm × 75mm section will finish at around 45mm × 70mm, with eased edges for safer handling and easier fixing.

Pressure treated under licence using Celcure AC-500, this timber offers improved resistance to rot and insect attack. The treatment specification corresponds to Use Class 2 (UC2), making it suitable for internal structural use or protected external applications where occasional moisture exposure may occur. In practice, many customers also choose treated C24 timber for external projects where good detailing, drainage, and airflow are provided.

For best long-term performance, all cut ends should be sealed with a suitable preservative after cutting. While treated, this timber is not intended for direct ground contact.

Typical uses include studwork, framing, joists, bracing, pergolas, garden structures, decking sub-frame details, and general construction, where a strong but manageable section is required.

About timber sizes:
Although all timber is sold in metric sizes, imperial measurements remain widely used across the trade. We list both metric and imperial equivalents to help you find the correct product easily. Always use the metric measurement when measuring timber.

Why choose C24 over C16?
Most CLS timber in the UK is graded to C16, however:

• C24 is graded to a higher strength standard

• Achieved from slower-grown timber with tighter grain

• Approximately 50% stronger than C16

• Better suited to longer spans and heavier loads

Nominal size: 47mm × 75mm (3 × 2)
Finished size: approx. 45mm × 70mm
Grade: C24 strength graded
Treatment: Pressure treated (Tanalised – Celcure AC-500)
Use Class: UC2
Moisture content: Kiln dried to ≤20%