Treated sawn Reg C24 Timber 75mm x 225mm

Treated sawn Reg C24 Timber 75mm x 225mmTreated sawn C24 timber 75mm x 225mm is a strength graded structural section suitable for demanding load bearing applications including floor joists, rafters, and ridge boards. Kiln dried to 20% moisture content or less, stress graded to BS 4978, and regularised for consistent sizing throughout. Specifications Property Detail Material Softwood (regularised sawn) Treatment Preservative treated Grade C24, stress graded to BS 4978 Finish Regularised

Treated sawn C24 timber 75mm x 225mm is a strength-graded structural section suitable for demanding load-bearing applications including floor joists, rafters, and ridge boards. Kiln dried to 20% moisture content or less, stress graded to BS 4978, and regularised for consistent sizing throughout.

Specifications

What it's used for

• Floor joists in new build and renovation projects requiring longer spans or heavier loads
• Roof rafters and ridge boards where C24 grade is specified by a structural engineer or building control
• Structural stud work and carcassing in timber frame construction
• Header beams and trimmer joists around openings in floors and roofs

Fitting and handling

Store timber flat on level bearers, off the ground, and keep it covered until installation to prevent moisture uptake. Although kiln dried to 20% or less, allow the timber to acclimatise on site for a minimum of 48 hours before fixing, particularly in heated buildings. Fasten using structural ring-shank nails or approved joist hanger fixings in accordance with your building specification, and ensure all cut ends are treated with an appropriate end-grain preservative before installation.

FAQ

What is the difference between C16 and C24 timber, and when do I need C24?

C24 has a higher bending strength and stiffness than C16, making it the right choice where spans are longer, loads are heavier, or a structural engineer or building regulations drawing specifies C24. For standard stud partitions and light-duty work, C16 is often sufficient, but for floor joists and rafters over longer spans, C24 is the safer specification.

Is this timber suitable for use in a roof or floor where building control approval is required?

Yes. This timber is stress graded to BS 4978 and regularised, which means it meets the requirements commonly called for by building control for structural applications. Always confirm the specific section size and span with your engineer or building control officer before ordering.

Browse the full range of C24 graded timber available from Nottage Timber Merchants, supplied direct from our yard in Bridgend, South Wales, with next-day delivery available across the South Wales area for orders placed before our daily cut-off.