CLS

Frequently asked questions

What strength classes are available for construction timber?
Structural timber is graded into different strength classes such as C14, C24, and C30. C24 is the most common and is used for the majority of construction projects.
When is C24 used compared to C14?
C24 is used for load-bearing structures such as beams and joists in floor systems. It is stronger and more durable, making it suitable for constructions that need to withstand higher loads. C14 is typically used for wall studs in load-bearing interior and exterior walls where the requirements for deformation are not as high.
What are treated an untreated carcassing?
Untreated carcassing is natural and used indoors or in protected environments. Treated carcassing is treated to resist moisture and rot, making it suitable for outdoor use.
How do I store timber correctly to prevent damage?
Protect from Moisture: Store the timber in a dry place, protected from rain and ground moisture. Use pallets or similar supports to keep the wood off the ground. Ventilation: Ensure that air can circulate around the timber. This helps prevent mould and rot. Protect from Sunlight: Avoid direct sunlight, as it can cause cracking and warping. Covering: Use a tarpaulin or other protective covering, but make sure there is space for the air to circulate. Regular Inspection: Check the wood regularly to ensure it hasn’t been damaged or exposed to moisture.
How do I choose the right size timber?
The size you need depends on what you’re building. Common dimensions are 45 x 95 mm and 45 x 145 mm. For load-bearing structures such as roof trusses, C30 may be necessary. Contact customer service for assistance.
Where can I buy Södra’s products?
Södra’s products are available at many building supply stores and retailers. To find the right stockist, we recommend that you: Visit your local building supplier – they often carry our products in stock or can order them for you. Contact our customer service – they’ll be happy to help find a store near you.

reliability and versatility

Options

Our CLS and joisting products are available in a variety of sections and lengths ideally suited to the requirements of modern methods of construction. CLS products can also be manufactured at the sawmill precision end trimmed to length (PET) for customers who use consistent volumes on a regular basis.

We have high-pressure and low-pressure preservative treatment facilities at both New Holland and Sheerness along with low-pressure facilities at Dundee and Wicklow enabling us to treat to your requirements upon request.