Fixing and buying guide
3.6Mtr X 75 X 150mm C24 Treated Regularised KD Carcassing Timber
Selecting the right size
This product is supplied at 75 × 150mm cross-section, a standard dimension for floor joists, roof battens, stud walls, and decking frames. Verify your structural design calculations or building control requirements to confirm this section is appropriate for your intended load and span. The 3.6 metre length suits most standard residential applications; longer or shorter lengths may be available separately.
- Check your structural engineer's specification or building plans for required timber dimensions
- Confirm the 75 × 150mm section meets your load-bearing requirements
- Measure your installation space to ensure the 3.6 metre length is suitable
Understanding C24 grading
C24 is a strength grade assigned under BS EN 338 standards. It indicates superior load-bearing capacity and stability compared to lower grades such as C16. C24 timber typically exhibits fewer knots and better overall quality, making it the preferred choice for structural applications where reliability and performance are essential.
- C24 offers higher bending strength and stiffness than C16
- Suitable for applications requiring enhanced structural performance
- Meets current UK building standards for carcassing work
Pressure treatment and durability
This timber is pressure-treated with preservative to protect against rot, fungal decay, and insect infestation. The treatment extends the service life of the timber, particularly in damp or exposed conditions. Treated timber is suitable for both internal and external use, though you should still follow good building practice regarding ventilation and moisture management.
- Pressure-treated for long-term protection against decay and insect attack
- Suitable for use in areas of high moisture or exposure
- Retains structural properties throughout its service life
Fixing methods
C24 Treated Carcassing Timber can be fixed using standard fastening methods appropriate to your application. Common approaches include nailing, screwing, or bolting, depending on the structural requirements and connection details specified in your design. Ensure all fixings are corrosion-resistant, particularly in treated timber applications. Pre-drilling may be necessary to prevent splitting, especially near timber edges.
- Use corrosion-resistant fixings (stainless steel or galvanised) to avoid reaction with treatment
- Pre-drill where necessary to prevent splitting
- Follow your structural design for fixing spacing and specification
Storage and handling
The timber is supplied kiln-dried and regularised (planed smooth). Store it in a dry location, protected from weather and ground contact. Handle carefully to avoid damage to the planed finish. Allow the timber to acclimatise to site conditions before installation if it has been stored in significantly different humidity environments.
- Keep timber dry and protected from rain and ground moisture
- Store on level, well-ventilated supports
- Handle with care to preserve the planed finish