Fixing and buying guide
4.2Mtr X 47 X 225mm C24 Treated Regularised KD Carcassing Timber
Selecting the right size
This product is supplied at 4.2 metres length with a cross-section of 47 × 225mm. Verify your project requirements against these dimensions before purchase. C24 timber is suitable for floor joists, roof battens, stud walls, and decking frames. Check your building plans or structural engineer's specifications to confirm the correct section size for your load-bearing application.
- Confirm length and cross-section match your project layout
- C24 grade provides superior load-bearing capacity compared to C16
- Regularised finish means consistent sizing across all pieces
Storage and handling
Treated timber should be stored in dry conditions to maintain its properties. Stack pieces horizontally with spacers between layers to allow air circulation and prevent moisture accumulation. Avoid prolonged exposure to standing water, though the pressure treatment provides protection against rot and decay.
- Store under cover in a well-ventilated area
- Use spacers between layers to allow drying
- Keep away from direct ground contact before installation
Fixing methods
C24 timber accepts standard fixings for structural applications. Use appropriate fasteners for your specific application—galvanised or stainless steel fixings are recommended to prevent corrosion when used with treated timber. For joists and structural work, follow building regulations and your structural engineer's specifications regarding spacing, support, and connection details.
- Use corrosion-resistant fasteners (galvanised or stainless steel)
- Follow BS EN standards and building regulations for spacing and support
- Consult structural plans for load-bearing applications
Quantity and ordering
Calculate your requirements based on the 4.2 metre length and 47 × 225mm section. Account for cutting waste and any additional pieces needed for bracing or support. Order slightly above your calculated requirement to allow for material loss during cutting and fitting.
- Measure your project span and calculate pieces required
- Allow for cutting waste and fitting tolerances
- Order in whole pieces—this product is supplied at 4.2 metres