Fixing and buying guide
6.0Mtr X 47 X 125mm C24 Treated Regularised KD Carcassing Timber
Selecting the right size
This 47 × 125mm section is a standard carcassing size suitable for floor joists, roof battens, stud walls, and decking frames. The 6.0 metre length offers flexibility for most residential and light commercial applications. Consider your span requirements and load conditions when determining whether this section meets your structural needs.
- Check your building design calculations to confirm section adequacy for your application
- Account for any notching or drilling that may reduce effective depth
- Verify that 6.0 metres suits your layout to minimise waste and joints
Understanding C24 grading
C24 is a strength grade that indicates this timber has been visually or machine-graded to meet specific strength and stiffness requirements. It offers enhanced load-bearing capacity, fewer knots, and improved stability compared to lower grades such as C16, making it the preferred choice for structural applications where reliability is essential.
- C24 timber meets BS EN 338 standards for structural use
- Superior strength allows for longer spans or heavier loads than lower grades
- Fewer defects result in more consistent performance across batches
Pressure treatment and durability
This timber is pressure-treated with preservative to protect against rot, fungal decay, and insect attack. The treatment penetrates the wood fibres, providing long-term protection in both sheltered and exposed conditions. Treated timber is suitable for use in contact with the ground or in damp environments where untreated timber would deteriorate.
- Treatment extends service life significantly in outdoor and high-moisture applications
- Suitable for use in ground contact and exposed locations
- Retains protective properties throughout the timber's lifespan
Handling and storage
Regularised and kiln-dried (KD) timber has been planed to consistent dimensions and dried to reduce movement. Store timber flat and level on bearers in a dry location, protecting it from direct weather exposure. Allow air circulation around stacks to prevent moisture accumulation, which can cause warping or mould growth.
- Keep timber dry and well-ventilated during storage
- Stack horizontally with spacers between layers to allow air flow
- Protect from prolonged direct sunlight and rain exposure
- Handle carefully to avoid damage to edges and faces
Fixing and installation
Use appropriate fixings for your application—typically galvanised or stainless steel nails, screws, or bolts to prevent corrosion and staining. Ensure fixings are driven cleanly without splitting the timber. For structural connections, follow building regulations and your design engineer's specifications regarding spacing, size, and type of fixings.
- Use corrosion-resistant fixings to prevent rust staining and degradation
- Pre-drill where necessary to avoid splitting, particularly near edges
- Follow building control requirements for spacing and sizing of fixings
- Ensure adequate bearing and support at all connection points