The Story
C24 graded structural timber in a 47mm x 75mm sawn regularised section is a reliable choice for joisting, stud work, and general framing across domestic and commercial builds. Kiln dried to 20% moisture content or below, it offers consistent sizing and compliance with UK building regulations.
Specifications
| Property | Detail |
|---|---|
| Material | Softwood (regularised structural carcassing timber) |
| Grade | C24, stress graded to BS 4978 |
| Finish | Sawn regularised, eased corners |
| Nominal Size | 47mm x 75mm (3 x 2 inch) |
| Finished Size | Approximately 45mm x 70mm |
| Treatment | Kiln dried to 20% moisture content or below |
| Lengths Available | 2.4m (8ft), 3.6m (12ft), 4.8m (16ft) |
| Profile | Regularised all round with eased corners |
What it's used for
- Floor joisting and flat roof joisting in domestic and light commercial construction
- Stud work and internal timber framing for partition walls
- Rafter and ceiling joist work where a lighter section is sufficient without dropping to C16
- General structural carcassing and noggin work in new builds and extensions
Fitting and handling
Store timber off the ground on level bearers, under cover, with adequate air circulation to prevent moisture uptake before installation. When cutting and fixing, use appropriate structural joist hangers or approved metal connectors rated for C24 grade loads, and follow your structural engineer's or building inspector's specification. Eased corners make handling safer on site, but always wear appropriate PPE when cutting regularised structural sections.
FAQ
What is the difference between C16 and C24 structural timber?
C24 is a higher stress grade than C16, meaning it can carry greater loads in equivalent cross-sections. It is graded to BS 4978 and is typically specified by structural engineers where C16 would require a larger section to achieve the same performance. For most domestic joist and rafter work, your building inspector or engineer will confirm which grade is required.
Is 47mm x 75mm C24 timber suitable for floor joists?
It can be used for floor joisting over shorter spans, but suitability depends on joist spacing, span length, and load requirements. Always check against the span tables in the current edition of the TRADA Span Tables for Solid Timber Members or confirm with your structural engineer or building control officer before installation.
What does regularised mean on structural timber?
Regularised timber has been processed to a consistent cross-sectional size after sawing, so all pieces in a batch finish to the same depth. This is particularly important for joisting, as it ensures a flat, even ceiling or floor line without the variation you would get from sawn-only timber.
Browse the full range of C24 graded timber at Nottage Timber Merchants. We supply trade and self-build customers across Bridgend and South Wales, with competitive pricing and reliable stock available for collection or local delivery.
Description
C24 graded structural timber in a 47mm x 75mm sawn regularised section is a reliable choice for joisting, stud work, and general framing across domestic and commercial builds. Kiln dried to 20% moisture content or below, it offers consistent sizing and compliance with UK building regulations.
Specifications
| Property | Detail |
|---|---|
| Material | Softwood (regularised structural carcassing timber) |
| Grade | C24, stress graded to BS 4978 |
| Finish | Sawn regularised, eased corners |
| Nominal Size | 47mm x 75mm (3 x 2 inch) |
| Finished Size | Approximately 45mm x 70mm |
| Treatment | Kiln dried to 20% moisture content or below |
| Lengths Available | 2.4m (8ft), 3.6m (12ft), 4.8m (16ft) |
| Profile | Regularised all round with eased corners |
What it's used for
- Floor joisting and flat roof joisting in domestic and light commercial construction
- Stud work and internal timber framing for partition walls
- Rafter and ceiling joist work where a lighter section is sufficient without dropping to C16
- General structural carcassing and noggin work in new builds and extensions
Fitting and handling
Store timber off the ground on level bearers, under cover, with adequate air circulation to prevent moisture uptake before installation. When cutting and fixing, use appropriate structural joist hangers or approved metal connectors rated for C24 grade loads, and follow your structural engineer's or building inspector's specification. Eased corners make handling safer on site, but always wear appropriate PPE when cutting regularised structural sections.
FAQ
What is the difference between C16 and C24 structural timber?
C24 is a higher stress grade than C16, meaning it can carry greater loads in equivalent cross-sections. It is graded to BS 4978 and is typically specified by structural engineers where C16 would require a larger section to achieve the same performance. For most domestic joist and rafter work, your building inspector or engineer will confirm which grade is required.
Is 47mm x 75mm C24 timber suitable for floor joists?
It can be used for floor joisting over shorter spans, but suitability depends on joist spacing, span length, and load requirements. Always check against the span tables in the current edition of the TRADA Span Tables for Solid Timber Members or confirm with your structural engineer or building control officer before installation.
What does regularised mean on structural timber?
Regularised timber has been processed to a consistent cross-sectional size after sawing, so all pieces in a batch finish to the same depth. This is particularly important for joisting, as it ensures a flat, even ceiling or floor line without the variation you would get from sawn-only timber.
Browse the full range of C24 graded timber at Nottage Timber Merchants. We supply trade and self-build customers across Bridgend and South Wales, with competitive pricing and reliable stock available for collection or local delivery.
