Browse the full range of C24 graded timber at Nottage Timber Merchants. We supply trade and retail customers across Bridgend and South Wales, with next-day delivery available to local areas. Contact us directly for volume pricing or cut-to-length enquiries.
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The Story
C24 sawn regularised structural timber in 47mm x 175mm (finished approximately 45mm x 170mm) is a heavy-section softwood graded to BS EN 338 for use in load-bearing applications including floor joists, roof rafters and purlins. Kiln dried to 20% moisture content or below for improved dimensional stability on site.
Specifications
| Property | Detail |
|---|---|
| Material | Softwood (kiln dried) |
| Grade | C24 structural grade (BS EN 338) |
| Finish | Sawn regularised, eased edges |
| Nominal Size | 47mm x 175mm |
| Finished Size | Approximately 45mm x 170mm |
| Lengths Available | 3.6m (12ft), 4.8m (16ft) |
| Moisture Content | Kiln dried to 20% or below |
What it's used for
- Floor joists in new build and renovation projects where longer spans require a deeper section
- Roof rafters and purlins in pitched roof construction
- Load-bearing wall frames and structural lintels
- Structural subframes for decking and commercial timber framing
Fitting and handling
Allow the timber to acclimatise on site for at least 24 to 48 hours before fixing, keeping it stacked flat on bearers in a covered, ventilated area to prevent warping. For joist and rafter applications, fix with joist hangers, structural screws or ring-shank nails rated for the load requirement, following the relevant sections of the Building Regulations Approved Document A. Store off the ground and under cover if not immediately installed, particularly during wet Welsh weather.
FAQ
What is the difference between C16 and C24 structural timber?
C24 has a higher bending strength and stiffness rating than C16 under BS EN 338, making it the correct choice where longer spans, heavier loads or Building Control specifications call for a stronger section. C16 is suitable for lighter-duty framing and stud work.
Is this timber suitable for floor joists?
Yes. The 47mm x 175mm C24 section is widely used for floor joists across standard domestic and commercial spans. Always check your structural engineer's specification or span tables to confirm the correct centres and section size for your project.
What does regularised mean for sawn timber?
Regularised means the timber has been processed after sawing to a consistent depth, typically reducing the 175mm nominal height to approximately 170mm with eased (slightly rounded) edges. This ensures boards sit level when fixed side by side, which is particularly important for floor joist installations.
Browse the full range of C24 graded timber at Nottage Timber Merchants. We supply trade and retail customers across Bridgend and South Wales, with next-day delivery available to local areas. Contact us directly for volume pricing or cut-to-length enquiries.
Description
C24 sawn regularised structural timber in 47mm x 175mm (finished approximately 45mm x 170mm) is a heavy-section softwood graded to BS EN 338 for use in load-bearing applications including floor joists, roof rafters and purlins. Kiln dried to 20% moisture content or below for improved dimensional stability on site.
Specifications
| Property | Detail |
|---|---|
| Material | Softwood (kiln dried) |
| Grade | C24 structural grade (BS EN 338) |
| Finish | Sawn regularised, eased edges |
| Nominal Size | 47mm x 175mm |
| Finished Size | Approximately 45mm x 170mm |
| Lengths Available | 3.6m (12ft), 4.8m (16ft) |
| Moisture Content | Kiln dried to 20% or below |
What it's used for
- Floor joists in new build and renovation projects where longer spans require a deeper section
- Roof rafters and purlins in pitched roof construction
- Load-bearing wall frames and structural lintels
- Structural subframes for decking and commercial timber framing
Fitting and handling
Allow the timber to acclimatise on site for at least 24 to 48 hours before fixing, keeping it stacked flat on bearers in a covered, ventilated area to prevent warping. For joist and rafter applications, fix with joist hangers, structural screws or ring-shank nails rated for the load requirement, following the relevant sections of the Building Regulations Approved Document A. Store off the ground and under cover if not immediately installed, particularly during wet Welsh weather.
FAQ
What is the difference between C16 and C24 structural timber?
C24 has a higher bending strength and stiffness rating than C16 under BS EN 338, making it the correct choice where longer spans, heavier loads or Building Control specifications call for a stronger section. C16 is suitable for lighter-duty framing and stud work.
Is this timber suitable for floor joists?
Yes. The 47mm x 175mm C24 section is widely used for floor joists across standard domestic and commercial spans. Always check your structural engineer's specification or span tables to confirm the correct centres and section size for your project.
What does regularised mean for sawn timber?
Regularised means the timber has been processed after sawing to a consistent depth, typically reducing the 175mm nominal height to approximately 170mm with eased (slightly rounded) edges. This ensures boards sit level when fixed side by side, which is particularly important for floor joist installations.
Browse the full range of C24 graded timber at Nottage Timber Merchants. We supply trade and retail customers across Bridgend and South Wales, with next-day delivery available to local areas. Contact us directly for volume pricing or cut-to-length enquiries.
