Tanalised Treated Timber 47 x 125mm 3.0m – 5×2 Timber
Tanalised Treated Timber 47 x 125mm 3.0m is a versatile pressure-treated softwood section suitable for outdoor construction, landscaping and general building projects. It is commonly referred to as 5×2 timber, based on its traditional approximate imperial dimensions of 5 inches by 2 inches.
The 125mm depth provides a useful intermediate size between common 4×2 and 6×2 timber. This makes it a practical option for projects requiring a more substantial profile than 4×2 without the additional depth and weight of larger timber sections.
Its convenient 3.0-metre length is easy to transport, store and manoeuvre while providing sufficient material for many garden, landscaping and building applications. It can be installed as supplied or cut into smaller components to meet the requirements of the project.
The timber has undergone a controlled pressure-treatment process to provide additional protection against fungal decay and wood-destroying insects. This improves its durability compared with untreated softwood when the timber is correctly specified, installed and maintained in suitable external conditions.
Product dimensions
The nominal product dimensions are:
- Metric section: 47mm x 125mm
- Common imperial name: 5×2 timber
- Length: 3.0m
- Material: Treated softwood
- Treatment: Pressure treated or tanalised
- Suitable for: Building, landscaping and outdoor projects
The term 5×2 is a traditional trade description rather than an exact imperial conversion. Use the stated metric dimensions when planning, measuring and cutting the timber.
What is tanalised treated timber?
Tanalised timber is softwood treated with wood preservative through a controlled vacuum and pressure process. This encourages the preservative to penetrate further into the timber than a simple brush-applied surface coating.
The treatment helps protect the wood against fungal decay and attacks from wood-destroying insects. It can help extend the product’s service life when the timber is correctly installed and used in a suitable outdoor environment.
Pressure treatment does not make timber completely waterproof or maintenance-free. The wood can still absorb and release moisture, resulting in natural movement, shrinkage, weathering, surface checking and gradual colour changes.
Cutting, drilling or notching can expose internal wood that may not have received the same level of treatment. Apply a suitable end-grain wood preservative to all freshly exposed areas during installation.
Common uses for 5×2 treated timber
The 47 x 125mm section is suitable for a broad variety of garden, landscaping and general construction projects.
Depending on its strength grade and the project specification, possible applications include:
- Outdoor timber frameworks
- Garden sheds and buildings
- Landscaping projects
- Timber supports and bearers
- Garden screens and dividers
- Agricultural and equestrian structures
- Raised garden features
- External carpentry and joinery
- General repair and maintenance work
- Bespoke outdoor structures
- Repairs to existing timber frameworks
- Load-bearing members where correctly graded
Where structural performance is required, confirm that the timber has the appropriate strength classification. Tanalised timber should not automatically be assumed to be C16 or C24 unless the product is specifically marked and sold with that grade.
The required span, loading, support spacing, connections and fixing arrangement should be determined by a suitably competent person for structural applications.
Benefits of the 3.0m length
The 3.0-metre length is a practical choice for many everyday building, landscaping and garden projects. It is easier to transport, store and move around a typical site than longer timber lengths.
The timber may be installed as a complete length or divided into several smaller components. Preparing a cutting plan before beginning work can help minimise waste and make efficient use of the available material.
Its relatively manageable length makes it suitable for professional tradespeople and experienced DIY users. The weight of each piece may vary depending on moisture content, so appropriate handling procedures should still be followed.
Benefits of pressure-treated softwood
Using pressure-treated timber provides several advantages for suitable outdoor applications:
- Additional protection against fungal decay
- Protection against wood-destroying insects
- Improved durability compared with untreated softwood
- Suitable for many external projects
- Useful for landscaping and garden construction
- Can be cut and worked using suitable tools
- Practical for repair and maintenance work
- Suitable for professional and DIY use
The correct treatment or use class must still be chosen for the intended environment. Timber installed in direct ground contact or exposed to persistent moisture may require a particular treatment specification.
Natural characteristics of timber
Timber is a natural product, so each length will vary in grain pattern, shade, knots and surface texture. These differences are normal and form part of the material’s natural appearance.
Knots, resin pockets, minor splits and surface checking may be present. These characteristics do not automatically indicate a defect, although their suitability will depend on the intended application and any relevant grading requirements.
Pressure treatment introduces moisture into the timber. As the wood dries, some natural shrinkage, twisting, bowing or cupping may occur. Appropriate storage, acclimatisation and installation can help manage this movement.
Newly treated timber may initially have a green or brown appearance depending on the preservative system used. Its colour will generally fade and weather gradually following outdoor exposure.
Important sizing information
Please note: Timber dimensions are nominal and may vary slightly due to machining, pressure treatment, moisture content and the natural movement of the wood.
The common name 5×2 is an approximate imperial description rather than a guarantee of exact finished measurements. Customers requiring precise dimensions should check the timber before installation or contact us to confirm the current stock specification.
Allow the timber to acclimatise where appropriate before completing work involving precise joints or close-fitting sections.
Cutting and installation
Use suitable woodworking tools fitted with sharp blades when cutting or drilling this timber. Wear protective gloves, eye protection and appropriate respiratory protection while handling, sawing or sanding treated wood.
Carry out cutting in a well-ventilated area and avoid breathing timber dust. Collect sawdust and offcuts for responsible disposal. Pressure-treated wood must not be burned on domestic fires, in wood-burning appliances or on garden bonfires.
Apply a compatible end-grain preservative to all cut ends, drilled holes and notches. Use corrosion-resistant fixings suitable for treated timber, particularly in external or regularly damp environments.
Where the timber forms part of a load-bearing structure, supports, connections and fixings must follow the approved design and be appropriate for the anticipated loads.
Storage and maintenance
Store the timber flat, raised above the ground and supported at suitable intervals. Protect it from prolonged saturation while allowing sufficient airflow around the lengths.
For visible outdoor projects, a compatible wood stain, oil or protective coating may be applied after the timber has dried sufficiently. Follow the coating manufacturer’s instructions regarding surface preparation and moisture content.
Inspect external timber periodically, paying particular attention to cut ends, joints, fixing points and areas where water might collect.
Key benefits
- Versatile 47 x 125mm timber section
- Commonly known as 5×2 timber
- Convenient 3.0m length
- Pressure treated against decay and insects
- Suitable for outdoor frameworks and landscaping
- Useful for garden structures and repairs
- Practical intermediate size between 4×2 and 6×2
- Easier to handle than longer timber lengths
- More durable than untreated softwood
- Suitable for trade and DIY construction
Tanalised Treated Timber 47 x 125mm 3.0m – 5×2 Timber provides a practical section and manageable length for outdoor frameworks, garden structures, landscaping and general building projects. Always confirm its exact dimensions, treatment level and strength grade against the requirements of the intended application before installation.
