Tanalised Treated Timber 47 x 100mm 2.4m – 4×2 Timber
Tanalised Treated Timber 47 x 100mm 2.4m is a popular and versatile timber section suitable for many building, landscaping and outdoor woodworking projects. Commonly referred to by builders and tradespeople as 4×2 timber, it combines a practical 47 x 100mm nominal section with a convenient 2.4-metre length.
The 4×2 size is widely used because it provides a useful balance between strength, weight and ease of handling. Its 2.4m length is particularly convenient for smaller projects, repairs and installations where longer pieces would create unnecessary waste or be difficult to transport.
The timber has been pressure treated, commonly described as tanalised, to improve its durability. This treatment helps protect it against fungal decay and attacks from wood-destroying insects, making it suitable for many exterior and moisture-prone applications.
Product Dimensions
The nominal dimensions of this product are:
- Thickness: 47mm
- Width: 100mm
- Length: 2.4m
- Common imperial name: 4×2
- Finish: Tanalised or pressure treated
The name 4×2 timber is the traditional imperial trade description for this section. The supplied metric dimensions are approximately 47 x 100mm after processing.
All timber measurements should be considered nominal. The finished dimensions may vary slightly because of machining, pressure treatment, moisture content and natural timber movement. Check each piece before beginning work where precise finished measurements are essential.
What Is Tanalised Timber?
Tanalised timber has been treated with wood preservative inside a controlled pressure vessel. During treatment, preservative is driven into the timber rather than simply being applied to the outer surface.
This process helps the wood resist fungal decay and attacks from wood-destroying insects. When installed correctly and used in an appropriate environment, pressure-treated timber may provide a longer service life than comparable untreated wood.
Pressure treatment does not make timber completely waterproof or maintenance-free. Correct installation is still important. Provide suitable drainage and ventilation, avoid trapping water against the timber and protect newly exposed surfaces after cutting or drilling.
Common Uses for 4×2 Treated Timber
The practical 47 x 100mm section makes this timber suitable for numerous professional and DIY projects. Common applications may include:
- Outdoor timber frameworks
- Garden structures and pergolas
- Shed frames and repairs
- Raised beds and planters
- Fencing components
- Decking subframes, where appropriately specified
- Landscaping features
- Timber bracing and supports
- Workshop and agricultural projects
- General construction and joinery
- Repair and replacement work
- Projects requiring a traditional 4×2 section
The 2.4m length is easy to handle, transport and store compared with longer sections. It is particularly useful for smaller garden structures, repairs and projects based on common sheet-material dimensions.
The timber can also be cut into shorter sections, helping to minimise waste where several matching components are needed. Careful planning before cutting will help customers obtain the greatest possible use from each length.
Suitability will depend on the project design, treatment specification, expected loads and installation method. If the timber is intended for structural or load-bearing work, confirm that it has an appropriate strength grade.
Pressure-treated timber is not automatically C16, C24 or another structural grade unless it is specifically marked and sold as such. Structural spans, loads, fixings and support requirements should be confirmed by a suitably competent person.
Benefits of Pressure-Treated Timber
Outdoor timber can be exposed to rain, moisture, temperature changes and insects. Pressure treatment improves the wood’s resistance to biological deterioration and makes it practical for many exterior projects.
The principal benefits include:
- Commonly known as 4×2 timber
- Convenient 2.4-metre length
- Versatile 47 x 100mm nominal section
- Improved resistance to fungal decay
- Protection against wood-destroying insects
- Suitable for numerous outdoor applications
- Longer potential service life than untreated timber
- Suitable for professional and DIY projects
- Easy to handle, measure and cut
- Useful for framing, landscaping and repairs
The required treatment classification will depend on the intended application. Timber designed for above-ground use may have a different level of treatment from timber intended for permanent ground contact.
If the timber will be placed directly against soil, installed in continuously wet conditions or used in a particularly demanding location, confirm that its treatment or use class is suitable before installation.
Natural Appearance and Variations
Timber is a natural product, so every length will have an individual appearance. Differences in colour, grain and surface texture are normal. Individual pieces may contain knots, resin pockets, minor splits, wane, treatment marks and other naturally occurring characteristics.
Freshly treated timber may have a green or pale brown tint, depending on the timber species and preservative used. This colour will usually soften and change as the timber is exposed to daylight and weather.
Changes in moisture content may cause wood to expand, shrink, twist or develop small surface checks. These characteristics are normal in natural timber and do not necessarily affect its suitability for the intended application.
Please note that colours, sizes and finishes can vary slightly due to manufacturing and pressure-treatment processes. Product images should therefore be considered representative, as the supplied timber may not look exactly the same as the piece shown.
Cutting and Installation
The 2.4m length can be cut using suitable woodworking tools. Measure carefully before cutting and support the timber correctly to improve accuracy and reduce movement.
Cutting, drilling or notching can expose internal areas that may not contain the same level of preservative as the original treated surfaces. Apply an appropriate cut-end or end-grain timber preservative to these newly exposed areas, following the manufacturer’s instructions.
Use fixings that are compatible with pressure-treated timber and suitable for the installation environment. Galvanised or stainless-steel screws, nails and bolts are commonly selected for outdoor projects because unsuitable metal fixings may corrode or cause staining.
Wear gloves, eye protection and a suitable dust mask when cutting or drilling. Work in a ventilated location, wash your hands after handling the timber and dispose of waste responsibly. Tanalised timber should never be burned.
Storage and Maintenance
Before installation, store the timber flat, evenly supported and raised clear of the ground. Protect it from prolonged exposure to heavy rain while allowing air to circulate around each piece.
Once installed, the timber can be allowed to weather naturally or finished using a compatible exterior wood stain, paint or oil. Freshly treated or damp timber should be allowed to dry sufficiently before applying a decorative coating.
Inspect outdoor timber structures periodically for loose fixings, trapped moisture, damaged coatings and exposed cut surfaces. Completing minor maintenance promptly can help protect the timber and extend the life of the finished project.
Tanalised Treated Timber 47 x 100mm 2.4m provides a convenient and versatile 4×2 section for numerous garden, landscaping and general construction projects. Its pressure-treated finish offers improved durability compared with untreated wood, while the manageable 2.4m length makes it easy to transport, store and install.
Always inspect the actual dimensions, condition, treatment specification and strength grade before installation. Seek professional advice for structural or load-bearing projects to ensure the timber and proposed design are suitable.
