47mm x 100mm Sawn Treated Timber C16/C24 (4" x 2") 4.2m

What Is 4x2 Timber 4.2m?

Sawn Treated Timber (4x2) 4.2m is a premium treated timber available in both C16/C24 grades.

This timber has been subjected to an advanced pressure treatment technique, which significantly enhances its resistance to decay and fungal growth, ensuring optimal performance in damp and humid conditions. It is critical to note, though, that despite the efficacy of the treatment in maintaining the timber's integrity in moist environments, it does not confer waterproof properties to the material.

Additionally, the preservative process fortifies 4x2 Timber 4.2m against the threat of invasive pests, safeguarding your construction's structural integrity from potential damage caused by insects and other wood-boring entities. This dual protection ensures that our 4x2 Timber 4.2m is a resilient and dependable choice for building applications where endurance and longevity are paramount.

Treated timber is often used to build partition studwork, in conjunction with plasterboard and insulation - such as Rockwool RWA45 100mm - to boost acoustic performance. We supply good quality 50x100 timber in various lengths: 2.4m, 3m, 3.6m, 4.2m, 4.8m and 6m, all of which are sold in a consistent thickness of 47mm.

Please Note: The finished size of our carcassing timber may vary slightly from the nominal dimensions. You can expect to receive timber that is finished with a thickness 2mm less and a width 5mm less than the nominal measurements stated. Colour and finish are representative only and may vary slightly as this is a natural product.

Where Is 4x2 4.2m C16/C24 Used? 

Despite their difference in quality, both C16 and C24 timber will deliver well in most construction projects; while C16 wood is somewhat less durable than C24, it is still sturdy and resilient, making it suitable for strength and load-bearing.

We recommend using the stronger, more dependable C24 timber grade for larger-scale projects (or in applications where strength is critical, such as balconies, terraces, and bridges).

Thanks to the protective treatment of the timber, 47x100 treated timber can be used in many different indoor and outdoor applications such as: 

• Flooring
• Roofing - rafters/joists in a loft floor
• Walling
• Decking joists
• Carcassing timber in floor joists
• Garden furniture and other outdoor projects 

Sawn Treated Timber C16/C24 (4" x 2") 4.2m Benefits

• Tanalised timber pressure treated with Tanalith 'E' to prevent rot
• Kiln dried to improve stability and straightness
• Strength graded to C16/C24 for known structural performance
• Width: 100mm
• More length options may be available on request

What Does C16/C24 Carcassing Timber Mean?

C24 grade is superior to C16, offering greater strength with more knots and fewer defects. This suits it to tasks which require durability and sturdiness, namely structural applications, such as floor joists or roof battens.

C24 timber is a premium choice that can support higher loads and wider spans. Only good quality timber imported from areas where the weather conditions demand a slower growth rate (and hence a tighter grain) achieves a C24 grade.

Provided it is pressure-treated, C16 timber can be used externally in an outer structure of a building, as well as in decking. C16 graded timber is sturdy enough for most tasks and will satisfy performance requirements at a lower cost than C24 timber.