Tanalised Treated Timber 75 x 200mm 4.8m – 8×3 Timber
Tanalised Treated Timber 75 x 200mm 4.8m is a substantial length of pressure-treated softwood suitable for demanding building, landscaping and outdoor construction projects. This timber size is commonly referred to as 8×3 timber, based on its traditional approximate imperial dimensions of 8 inches by 3 inches.
Supplied in a practical 4.8-metre length, this treated timber provides a strong, versatile section for projects requiring greater depth and substance than standard framing timber. It may be used for suitable garden structures, landscape features, agricultural projects, outdoor frameworks and general construction work.
The timber has been pressure treated with wood preservative, commonly described as tanalised treatment. This process helps protect the material against fungal decay and wood-destroying insects, improving its durability when used in appropriate external applications.
Product dimensions
The nominal dimensions are:
- Metric section: 75mm x 200mm
- Common imperial name: 8×3 timber
- Length: 4.8m
- Material: Treated softwood
- Treatment: Pressure treated or tanalised
- Finish: Sawn timber
- Suitable for: Building, landscaping and outdoor projects
Although commonly called 8×3, the metric dimensions should always be used when planning and measuring a project. The imperial name is a familiar trade description and should not be treated as an exact finished measurement.
What does tanalised timber mean?
Tanalised timber is softwood that has been placed inside a treatment vessel and subjected to a controlled pressure-treatment process. This forces preservative deeper into the wood than a basic surface-applied coating.
The treatment helps protect the timber against biological threats such as fungal decay and wood-destroying insects. This makes treated timber a practical choice for many outdoor and exposed building applications.
Pressure treatment improves the durability of the timber, but it does not make the wood completely waterproof or maintenance-free. Exposure to rain, sunlight and changing temperatures can still cause natural movement, surface checking, weathering and colour changes.
Any cut ends, drilled holes or notches made during installation should be treated with a suitable end-grain wood preservative. This helps restore protection to areas where the original treatment envelope has been broken.
Common uses for 8×3 treated timber
The substantial 75 x 200mm section makes this timber suitable for a variety of demanding projects, subject to the correct design and specification.
Possible applications include:
- Heavy-duty garden structures
- Landscaping frameworks
- Raised garden features
- Outdoor retaining structures where suitably specified
- Agricultural and equestrian projects
- Timber edging and landscape construction
- Substantial outdoor supports
- General building projects
- Bespoke garden structures
- External carpentry and joinery
The suitability of the timber will depend on the required load, span, support arrangement and exposure conditions. Where the timber will perform a structural role, its required strength class and suitability should be confirmed before use.
Do not assume that treated timber is structurally graded unless the product is specifically marked and sold with a recognised strength grade such as C16 or C24.
Natural characteristics of timber
Timber is a natural material, so every length will differ slightly in colour, grain pattern and overall appearance. Knots, resin pockets, minor splits and variations in texture are common characteristics of softwood and are not necessarily product defects.
Pressure-treated timber may initially appear green or brown depending on the treatment used. The colour will normally fade and weather when exposed outdoors. Treatment marks and variations in shade can also be visible between different lengths or batches.
Moisture introduced during pressure treatment may cause temporary swelling. As the timber dries, its dimensions may reduce slightly, and some movement, twisting, bowing or surface checking may occur.
Important sizing information
Please note: Timber dimensions are nominal and may vary slightly due to the manufacturing process, pressure treatment, moisture content and natural movement of the wood.
The traditional name 8×3 is an approximate imperial description. Customers requiring precise finished dimensions should measure the timber before installation or contact us to confirm the current stock specification.
Allow timber to acclimatise appropriately before fitting, particularly where accurate joints or close tolerances are required.
Cutting and installation
Use suitable woodworking tools with sharp blades when cutting this 75 x 200mm treated timber. Wear appropriate gloves, eye protection and respiratory protection when sawing, drilling or sanding.
Avoid breathing timber dust and work in a well-ventilated area. Collect and dispose of waste responsibly. Treated timber should not be burned on domestic fires, garden bonfires or in wood-burning appliances.
All freshly exposed cut ends, notches and drilled areas should be coated with an appropriate end-grain preservative. Use corrosion-resistant fixings suitable for treated timber, particularly in external or moisture-prone environments.
For load-bearing applications, follow the project drawings and ensure the timber has the correct strength grade. Connections, supports and fixings should be designed for the intended loads.
Storage and maintenance
Store the timber flat, supported off the ground and protected from excessive moisture before installation. Provide support at suitable intervals to reduce the risk of bowing and twisting.
For visible outdoor applications, a compatible wood stain, oil or protective coating may be applied once the timber has dried sufficiently. Always follow the coating manufacturer’s preparation and moisture-content requirements.
Regular inspection and maintenance can help preserve the appearance and service life of external timber, particularly around cut ends, joints and areas where water may collect.
Key benefits
- Substantial 75 x 200mm timber section
- Commonly known as 8×3 timber
- Supplied in a long 4.8m length
- Pressure treated against fungal decay and insects
- Suitable for many outdoor and landscaping projects
- Useful for heavy-duty building applications
- Can be cut and worked using suitable timber tools
- Suitable for trade and DIY construction projects
- More durable than untreated softwood in appropriate conditions
- Versatile section for bespoke outdoor structures
Tanalised Treated Timber 75 x 200mm 4.8m – 8×3 Timber provides a substantial and versatile building material for landscaping, outdoor construction and general building projects. Always check the dimensions, strength grade and treatment suitability against the requirements of your project before installation.
