Fixing and buying guide
6.0Mtr 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 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. For longer spans or heavier loads, you may need to increase the section size or reduce spacing between supports.
- 47 × 100mm is a common section for residential joists and stud work
- 6.0 metre length suits standard building layouts
- Check your structural design or building regulations for required section sizes based on span and load
Understanding C24 grading
C24 is a strength grade that indicates this timber has been stress-graded to meet specific load-bearing standards. It offers enhanced stability, fewer knots, and improved strength compared to lower grades such as C16. This makes it suitable for structural applications where reliability and performance are essential.
- C24 timber meets BS EN standards for structural use
- Superior load-bearing capacity compared to C16
- Fewer defects and better overall quality
Pressure treatment and durability
This timber is pressure-treated with preservative to protect against rot, fungal decay, and insect infestation. The treatment penetrates the wood to provide long-term protection, making it suitable for both indoor and outdoor use. Treated timber is particularly valuable in damp environments or where moisture exposure is likely.
- Pressure-treated for rot and decay resistance
- Protects against insect attack
- Suitable for outdoor and exposed locations
- Extends service life significantly
Moisture content and handling
This timber is supplied kiln-dried (KD), meaning it has been dried to a controlled moisture content. Regularised timber has been planed to consistent dimensions, making it easier to handle and install. Store the timber in dry conditions and allow it to acclimatise to the building environment before installation to minimise movement and warping.
- Kiln-dried reduces moisture-related movement
- Regularised finish provides consistent sizing
- Store under cover in dry conditions
- Allow acclimatisation time before fixing
Fixing and installation
Use appropriate fixings for your application—typically galvanised or stainless steel nails, screws, or bolts to prevent corrosion and ensure compatibility with treated timber. Follow building regulations and structural design specifications for spacing, support centres, and connection details. Ensure adequate ventilation around the timber to prevent moisture accumulation.
- Use corrosion-resistant fixings
- Follow structural design specifications for spacing and support
- Maintain adequate ventilation
- Protect cut ends with preservative if required by your design