Carcassing & Joists
Our Carcassing & Joists range provides strong, versatile, and reliable structural timber for a wide variety of building applications. Supplied in popular sizes and lengths, these timbers are strength-graded to meet UK construction standards, making them suitable for load-bearing frameworks and general building work.
Carcassing timber is typically used for roofing, flooring, stud walls, and general structural joinery. Each piece is kiln-dried to improve stability and reduce the risk of warping, then pressure-treated to help protect against rot and insect attack. This makes it a dependable choice for projects where durability and performance are essential.
Our structural joists are available in C16 and C24 grades. C16 carcassing provides excellent strength for everyday building requirements, while C24 offers superior performance for demanding applications or where longer spans are required. Both are widely used by builders, joiners, and DIYers across the UK.
Carcassing & Joists are easy to work with using standard tools and can be cut, drilled, or notched on-site to suit your project. They also accept fixings, nails, and screws securely, ensuring strong and stable construction.
At TimberOnline (Nottage Timber Merchants), we supply high-quality structural timbers backed by decades of expertise, with stock ready for fast local delivery.
Tip: Always check spans and load requirements before selecting your joist grade to ensure compliance with building regulations.
Timber Joist Span Calculator (Indicative)
Assumptions: domestic floor, joists at selected centres, imposed load ≈ 1.5 kN/m², dead load ≈ 0.5 kN/m², service class 1–2, joist breadth ≈ 47 mm, minimum bearing ≈ 40 mm. Spans shown are clear spans (support-to-support).
Span Table
| Section Size (mm) | C16 – Max Clear Span (m) | C24 – Max Clear Span (m) |
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Usage notes: If supporting a lightweight partition perpendicular to joists, reduce spans by ~10%. For partitions running parallel, double up joists beneath the partition line. Notching/holes reduce capacity—follow current guidance.
Disclaimer: This tool is for guidance only and may not reflect the latest building regulations, standards, or your specific loading. Always verify with current codes and a competent designer. For approvals, please contact your local authority / Building Control.