CLS

CLS (Canadian Lumber Standard) timber is a high-quality, versatile softwood that's become a go-to material for internal framing and structural work in both residential and commercial builds. With its smooth planed finish, rounded edges, and consistent sizing, CLS timber is ideal for stud walls, partitioning, and timber frame construction.

What Is CLS Timber?

CLS timber originates from kiln-dried softwood—usually spruce, pine, or fir—that has been planed on all four sides with slightly rounded edges for safety and ease of handling. Originally manufactured to Canadian standards, CLS timber is now widely used throughout the UK and Europe for light structural framing.

Its clean finish, dimensional stability, and ease of use make it perfect for internal building work, especially where accuracy and a smooth surface are important.

Key Benefits of CLS Timber

• Planed and Smooth Finish: Ideal for interior use, making it easy to handle and safer on-site.
• Rounded Edges: Reduces splinters and improves handling—especially important for fast-paced construction environments.
• Kiln-Dried for Stability: Less prone to warping, twisting, or shrinking compared to untreated or rough sawn timber.
• Versatile Sizing: Regularised sizes like 38x63mm and 38x89mm fit standard wall and partition builds.
• Perfect for Plasterboard Backing: Smooth, straight edges create an ideal base for wall finishes.

Common Uses of CLS Timber

• Stud Wall Framing: The most popular use—CLS timber provides a strong, lightweight structure for plasterboard walls.
• Partition Walls: Perfect for dividing internal spaces in residential or commercial buildings.
• Roof Battens and Joists: Lightweight yet durable, making it great for non-load-bearing roof structures.
• Door Linings and Window Frames: Easy to cut and finish, ensuring a snug, professional fit.
• Timber Frame Construction: A top choice for speed, consistency, and precision in timber-framed buildings.

Treated vs Untreated CLS

• Treated CLS Timber: Ideal for areas with higher moisture exposure or where additional durability is needed.
• Untreated CLS: Best for dry internal spaces such as wall interiors or room partitions.

CLS timber is a versatile and reliable material for both professional builders and DIY enthusiasts. Its smooth finish, durability, and affordability make it a staple in construction and woodworking. 

Plane & Simple’s merchant partners will deliver CLS timber directly to you, saving you the inconvenience of transporting and handling bulky products.  Screws & fixings are available to help with your project.