Fixing and buying guide
6.0Mtr X 75 X 225mm C24 Treated Regularised KD Carcassing Timber
Specification and grading
This timber is strength-graded to C24 standard, indicating superior load-bearing capacity and reliability compared to lower grades such as C16. The 75 × 225mm cross-section provides substantial structural capability for floor joists, roof battens, stud walls, and decking frames. Regularised finish means the timber has been planed to consistent dimensions, improving handling and fit during installation. Kiln-dried (KD) status confirms moisture content has been controlled to reduce movement and warping in service.
- C24 strength grade suitable for structural applications
- Regularised planed finish for ease of handling and installation
- Kiln-dried to control moisture content and minimise movement
- Pressure-treated with preservative for durability
- 6.0 metre length reduces need for joints in many applications
Pressure treatment and durability
The timber has been pressure-treated with preservative to provide long-term protection in both covered and exposed conditions. This treatment protects against wood-boring insects, fungal decay, and rot, extending the service life significantly. The treatment is applied throughout the depth of the timber, not merely as a surface coating. For outdoor applications or areas of high moisture exposure, this treatment is essential.
- Preservative treatment protects against rot and fungal decay
- Resistant to wood-boring insect attack
- Suitable for both indoor and outdoor use
- Treatment penetrates throughout the timber depth
Storage and handling
Store the timber in a dry, well-ventilated location to maintain its kiln-dried condition. Stack horizontally on level ground or on bearers, with spacers between each piece to allow air circulation. Protect from direct rainfall and ground contact. Although treated, the timber should not be left exposed to weather for extended periods before installation. Handle carefully to avoid damage to the planed surfaces.
- Store in dry, ventilated conditions
- Stack horizontally with spacers for air flow
- Protect from prolonged weather exposure
- Avoid ground contact during storage
Buying considerations
Verify that the 6.0 metre length and 75 × 225mm cross-section meet your project requirements before purchase. Check that the quantity needed accounts for any waste or cutting. Confirm that C24 grade is appropriate for your structural application; if in doubt, consult structural design guidance or a qualified engineer. The treated status makes this timber suitable for a wider range of applications than untreated carcassing timber, though cost will be higher.
- Confirm length and cross-section suit your project layout
- Account for cutting waste in quantity calculations
- Verify C24 grade is suitable for your structural loads
- Treated timber costs more but offers greater durability