Fixing and buying guide
4.2Mtr X 47 X 100mm C24 Treated Regularised KD Carcassing Timber
Selecting the right size
This 47 × 100mm section is a standard carcassing size suitable for floor joists, roof battens, stud walls, and decking frames. The 4.2 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. For longer spans or heavier loads, you may require deeper or wider sections.
- 47 × 100mm is a common section for residential joists and stud work
- 4.2 metre length suits standard room widths and bay spacings
- C24 grade provides superior strength compared to C16 timber
- Check your building design calculations to confirm section adequacy
Understanding the treatment
This timber is pressure-treated with preservative to protect against rot, fungal decay, and insect infestation. The treatment is integral to the timber's durability, particularly where moisture exposure is likely. Treated timber is suitable for both internal and external use, though external applications will benefit from additional surface protection such as paint or stain.
- Pressure-treated for long-term protection against decay and insect attack
- Suitable for damp environments and external applications
- Treatment is throughout the timber, not just surface-applied
- Consider additional surface finishes for exposed external work
Handling and storage
Treated timber should be stored in dry conditions to prevent moisture uptake and warping. Stack timber horizontally with spacers between layers to allow air circulation. Avoid prolonged exposure to direct sunlight, which can cause surface checking. Handle with care to prevent damage to the planed finish.
- Store in a dry, well-ventilated location
- Use spacers between layers to allow air movement
- Protect from prolonged direct sunlight
- Handle carefully to preserve the smooth planed finish
Installation and fixing
Fix using appropriate fasteners for your application. For joists, use joist hangers or traditional bearing methods in accordance with building regulations. For stud walls, fix to plates using nails or screws at recommended centres. Ensure all fixings are corrosion-resistant, particularly in treated timber applications. Follow your structural design and local building control requirements.
- Use corrosion-resistant fasteners throughout
- Follow building regulations and structural design specifications
- Space fixings according to load requirements and building standards
- Ensure adequate bearing and support at all connection points