Yes, treated 4x2 timber can be used outside above ground. If you cut the timber, you must apply an end-grain preservative to the cut end, or the protection will be compromised and the wood will rot from the inside out.












47mm x 100mm Sawn Treated Timber C16/C24 (4" x 2") 2.4m
Project length
Key Features
- {{rounded_corner}} Regularised with an eased edge
- {{dry}} Kiln dried to improve stability and straightness
Technical Specification
| URN: | 4001150 |
|---|---|
| Product: | 4" x 2" |
| Application: | Floor joists, Stud walls, Roof rafters |
| Material Type: | Softwood |
| Nominal Thickness: | 47mm |
| Finished Thickness: | 45mm |
| Nominal Width: | 100mm |
| Finished Width: | 95mm |
| Length: | 2.4m |
| Weight: | 5.64kg |
| Sales Unit: | Length |
| Sales Unit Coverage: | 2.4m |
| Product Standard: | BS EN 14081 |
| Grade: | C16 / C24 Kiln Dried |
| Wood Species: | Softwood |
| Treatment Type: | Tanalith E |
| Edge: | Eased Edge |
| Colour: | Natural (varies by treatment batch) |
| Finish: | Sawn |
Product Overview
Sawn Treated Timber C24 featuring a 47mm x 100mm profile and a 2.4m length. This high-grade structural wood is pressure-treated to resist rot and fungal decay, providing robust load-bearing performance for demanding building environments.
Perfect for vertical wall studs because it matches standard UK plasterboard heights of 2400mm, meaning zero vertical wastage and easy indoor maneuverability.
Applications
- Internal stud walls: Forms the vertical framework for non-load-bearing and load-bearing partitions.
- Floor joists: Provides structural support for localised flooring spans and reinforcements.
- Roof construction: Suitable for rafters, structural bracing, and ceiling joist assemblies.
- Noggins and blocking: Ideal for horizontal bracing between vertical studs over short distances.
Compliance & Performance
- Finished sizing: Precisely finished to a 45mm x 95mm profile, ensuring consistent dimensions across the entire length for accurate framing and structural alignment.
- Natural variation: Colour and surface appearance vary naturally and by treatment batch.
- Moisture disclaimer: Treated Timber is often stored outside and if it has recently been raining then the timber may arrive wet; this does not affect the integrity of the timber.
Delivery & Returns Information
Delivery charges vary by product category and order value. Items may ship from different suppliers and arrive separately, so delivery charges can be shown per part of your order at checkout.
Standard (Nationwide) Delivery
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Core Products Core
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|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £200 ex. VAT | £15 ex. VAT |
| Over £200 ex. VAT | FREE |
Core Delivery is our most competitive delivery fee. To qualify for Core Delivery, all the products in your basket need to be from our Core range. Core products have the Core icon next to their picture.
| Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 | £30 ex. VAT |
| Over £300 ex. VAT | FREE |
Express Delivery
| Express Delivery - Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 | £50 ex. VAT |
| Over £300 ex. VAT | £35 ex. VAT |
How delivery works
We work with a nationwide network of trusted suppliers. Items in your basket may be supplied by different suppliers and delivered separately. Where this applies, you will see delivery charges shown at checkout for each part of your order. We always aim to group products from the same supplier to keep delivery costs as low as possible.
Delivery areas
Delivery charges apply to mainland UK, excluding: AB, CA, CF, DD, DG, EH, EX, FK, KA, KW, KY, IV, LA, LD, LL, ML, NP, PA, PH, PL, SA, SY, TR, TQ and TD.
If your address is in one of these areas, we will contact you before processing your order to confirm any additional costs. We do not currently offer delivery outside the UK mainland.
What to expect on delivery day
- Deliveries are typically kerbside.
- Please ensure someone is on-site to accept delivery. For heavier items, help with offloading may be required.
- Many building materials arrive on large vehicles. If access is restricted, a specialist vehicle such as a HIAB may be required and could incur an additional charge.
Why delivery can cost more than typical parcel delivery
Building materials often travel on larger vehicles and usually carry fewer drops per run than parcel networks. That is why delivery charges can be higher than standard e-commerce shipping.
Returns
Returns depend on what you have bought and whether there is anything wrong with it. For full details on eligibility, timeframes, and exclusions, please see our full policy.
Questions and Answers
Can treated 4x2 timber be used outside?
What length 4x2 do I need for a stud wall?
You should choose a length that allows for a single, continuous piece from the floor to the ceiling to ensure structural integrity. Always buy timber slightly longer than your floor to ceiling measurement to allow for precise trimming to fit.
How do I ensure I am ordering C24? I dont want C16 grade.
The best way to do this, would be to add a note in the "Note for Delivery Driver" section of the order stating that C24 is required. Our team will pick this up and make sure that the order is allocated accordingly.