CLS Studwork Timber – Planed Structural Softwood (Strength Graded)

CLS Studwork Timber is planed strength graded softwood commonly used for internal framing and stud wall construction. With its smooth planed finish and rounded edges, CLS is comfortable to handle, quick to install and ideal for consistent, straight studwork.

Our CLS timber is available in popular framing sizes including 38×63mm (3x2) and 38×89mm (4x2), in 2.4m and 4.8m lengths — ideal for partitions, garage framing, renovations and general construction work.

What Is CLS Timber?

CLS (Canadian Lumber Standard) timber is planed on all four sides with eased edges. It is produced to consistent finished sizing, making it a go-to choice for internal framing where straightness and repeatability matter — especially when fixing sheet materials or lining with plasterboard.

Common Uses

• Stud walls and partition walls
• Internal framing and timber carcassing
• Garage and outbuilding frameworks
• Loft conversions and room dividers
• Framework for lining boards and sheet materials

Why Choose CLS Studwork Timber?

• Planed finish with rounded edges for easier handling
• Strength graded softwood suitable for studwork applications
• Consistent sizing helps keep walls straighter and faster to build
• Popular sizes stocked: 38×63mm (3x2) and 38×89mm (4x2)
• Available in 2.4m and 4.8m lengths for reduced waste

3x2 vs 4x2 – Which Size Should I Choose?

• 38×63mm (3x2) is commonly used for basic partitions, lightweight framing and general studwork.
• 38×89mm (4x2) is ideal where you want a sturdier wall, extra depth for services/insulation, or a more rigid frame.

CLS vs Structural Treated Timber

CLS is typically used for internal framing. For external structural applications such as decking subframes or timber exposed to the weather, see our structural treated timber range.

Handling & Installation Notes

• Store timber flat, off the ground and covered prior to use
• Acclimatise indoors where possible before building internal studwork
• Use appropriate fixings and follow building guidance where required

Available for collection or delivery across South Wales including Swansea, Neath, Port Talbot, Bridgend, Cardiff and Newport.

Frequently Asked Questions

Is CLS timber structural?
CLS is strength graded timber commonly used for structural studwork and internal framing applications.

Can CLS timber be used outside?
CLS is typically used internally. For outdoor use, choose pressure treated structural timber designed for external exposure.

What’s the difference between 3x2 and 4x2 CLS?
3x2 CLS is ideal for standard partitions and lightweight framing. 4x2 CLS provides a stiffer frame and more depth for services or insulation.

What lengths are available?
This CLS timber is available in 2.4m and 4.8m lengths depending on the size selected.