Tanalised Treated Timber 47 x 175mm 6.0m – 7×2 Timber
Tanalised Treated Timber 47 x 175mm 6.0m is a substantial length of pressure-treated softwood for building, landscaping and outdoor construction projects. Commonly referred to as 7×2 timber, it combines a deep 175mm section with an extended 6.0-metre length.
This longer format may help reduce the number of joints needed across suitable frameworks and outdoor structures. It also provides the flexibility to cut multiple shorter sections from a single length when planned carefully.
The timber has undergone a controlled pressure-treatment process that helps protect it against fungal decay and wood-destroying insects. This improved durability makes it more suitable than untreated softwood for many external and exposed applications.
Product dimensions
The nominal product dimensions are:
- Metric section: 47mm x 175mm
- Common imperial name: 7×2 timber
- Length: 6.0m
- Material: Treated softwood
- Treatment: Pressure treated or tanalised
- Suitable for: Building, landscaping and outdoor projects
The term 7×2 is a traditional trade name based on the timber’s approximate imperial dimensions. The stated metric size should always be used when planning and measuring a project.
What is tanalised treated timber?
Tanalised timber is softwood that has been treated with preservative inside a controlled pressure vessel. The process encourages the preservative to penetrate deeper into the material than a simple brush-applied surface treatment.
This helps protect the timber against fungal decay and attacks from wood-destroying insects. It can extend the service life of the timber when the product is correctly selected, installed and maintained.
Tanalising does not make timber waterproof or completely maintenance-free. Outdoor exposure may still result in weathering, colour changes, surface checking and natural movement as the wood absorbs and releases moisture.
Any cut ends, notches or drilled holes created during installation should be treated with a suitable end-grain wood preservative. This helps protect the internal timber exposed when the original treated surface is broken.
Common uses for 7×2 treated timber
The combination of a 47 x 175mm section and a 6.0m length makes this timber useful for various substantial outdoor and general building projects.
Depending on its strength grade and the project specification, possible applications include:
- Outdoor timber frameworks
- Garden buildings and structures
- Landscaping projects
- Timber supports and bearers
- Agricultural and equestrian construction
- Raised garden structures
- External carpentry and joinery
- General building work
- Bespoke garden features
- Repairs to existing outdoor structures
- Load-bearing members where correctly graded
- Long timber runs requiring fewer joints
Where structural performance is required, confirm that the timber carries the correct strength classification for the application. Treated 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, support spacing, connections and fixings should be established by a suitably competent person.
Benefits of the 6.0m length
The extended 6.0-metre length offers additional flexibility for larger projects. Where the design permits, it may reduce the number of joints required and create a more continuous timber run.
A longer length can also be divided into several shorter components. Planning cuts before starting work can help minimise waste and make better use of the available timber.
Site access and handling should be considered before ordering. A 6.0m length requires sufficient room for delivery, storage, turning and installation.
The timber’s length and moisture content may make it heavy and awkward to handle. Use suitable lifting assistance and safe manual-handling procedures when moving or positioning the product.
Natural characteristics of softwood
Timber is a natural material, so variations in grain, colour, knots and texture are normal. No two lengths will be identical.
Knots, resin pockets, minor splits and surface checking may be visible. These characteristics are not necessarily defects, although their suitability will depend on the intended application and any applicable grading requirements.
Pressure treatment increases the timber’s moisture content. As the material dries, some shrinkage, twisting, bowing or cupping may occur. Longer pieces can show more noticeable movement and should be stored with adequate support.
Newly treated wood may have a green or brown shade depending on the preservative system used. This colour generally fades and weathers gradually following external installation.
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 7×2 is an approximate imperial description rather than a guarantee of exact finished dimensions. If precise measurements are essential, check the timber before installation or contact us to confirm the current stock specification.
Allowing the wood to acclimatise appropriately can be helpful where the project involves precise joints or close fitting tolerances.
Cutting and installation
Use suitable woodworking equipment fitted with sharp blades when cutting or drilling this timber. Wear gloves, eye protection and appropriate respiratory protection when handling, sawing or sanding treated wood.
Avoid breathing timber dust and work in a well-ventilated location. Collect sawdust and offcuts for responsible disposal. Pressure-treated timber should never be burned on a domestic fire, in a wood-burning appliance or on a garden bonfire.
Apply a compatible end-grain preservative to all cuts, drilled holes and notches. Use corrosion-resistant fixings suitable for treated timber, particularly in external or moisture-prone environments.
Where the timber forms part of a load-bearing structure, its supports, fixings and connections should follow the approved drawings and specification.
Storage and maintenance
Store the timber flat, raised above the ground and supported at regular intervals. Correct support is particularly important for 6.0m lengths, as poor storage may increase bowing or twisting.
For visible outdoor projects, a compatible wood stain, oil or protective coating may be applied once the timber has dried sufficiently. Follow the coating manufacturer’s preparation and moisture-content instructions.
Regular inspection and maintenance can help preserve the timber, particularly around joints, cut ends, fixing points and horizontal surfaces where water could collect.
Key benefits
- Substantial 47 x 175mm section
- Commonly known as 7×2 timber
- Extended 6.0m length
- May reduce joints across longer structures
- Pressure treated against decay and insects
- Suitable for outdoor frameworks and landscaping
- Useful for garden and agricultural structures
- Can be cut for different project requirements
- More durable than untreated softwood
- Suitable for trade and DIY construction
Tanalised Treated Timber 47 x 175mm 6.0m – 7×2 Timber provides a substantial section and extended length for larger outdoor, landscaping and general building projects. Always confirm its dimensions, treatment level and strength grade against the requirements of the intended application before installation.
