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Key Features
{{foundation}} Used in a variety of structural applications
{{water_drop}} Offers load-bearing performance in humid conditions
Technical Specification
Technical Specification
URN:
4003001
Application:
Roofs & walls
Thickness:
11mm
Width:
1220mm
Length:
2440mm
Weight:
18.33kg
Sales Unit:
Sheet
Sales Unit Coverage:
2.98m2
Grade:
OSB3
Wood Species:
Pine / Spruce
Edge:
Square
Bond Class:
BS EN300
Formaldehyde Level:
E1 (low)
Country of Origin:
Latvia
Product Overview
Structural OSB 3 Sterling board, measuring 2440mm x 1220mm (8' x 4') with an 11mm thickness.
Engineered from cross-laminated softwood strands and bonded with resin under heat and pressure, it delivers consistent strength and stability without knots or voids.
Certified to EN 300 OSB 3 for load-bearing performance in humid conditions, it serves as a practical and cost-effective alternative to plywood for many structural applications such as roofing decks, wall panels, and general sheathing.
Features & Benefits
Structural classification: OSB 3 certified to EN 300, for load-bearing use in humid conditions.
BBA approved: Permits use in a wide range of commercial and domestic projects.
Void-free construction: Consistent strength with no knots or core gaps.
Cross-strand stability: Resists warping, splitting, and expansion.
Workability: Easy to cut, drill, nail, and sand with standard tools.
Board size 2440mm x 1220mm: Compatible with UK framing centres for straightforward fixing on standard stud/joist spacing.
Thickness 11mm: Provides reliable strength for roofing, sheathing, and general panel work.
Applications
Roof decking: Acts as a stable, load-bearing base beneath membranes and primary roof coverings.
Sarking: Used under the primary roof covering (like slates or tiles) to provide a secondary barrier and add rigidity to the roof structure.
Timber frame wall sheathing: Structural EN 300 classification provides necessary lateral stability and stiffness when fixed to internal timber studwork at 600mm centres.
Flooring underlayment: Provides a solid, level surface suitable for light domestic flooring applications.
Site hoardings: Delivers a durable, cost-effective solution for temporary site enclosures and fencing.
Sheds and garden buildings: Ideal for robust construction of walls, roofs, and flooring.
Shopfitting and displays: Versatile enough for the fabrication of shelving units, structural stands, and internal panelling.
General DIY projects: Practical for wide-ranging construction tasks requiring a high-strength, stable panel.
Garden shed construction: High racking resistance and moisture-tolerant resin make 11mm boards ideal for cost-effective wall sheathing and roof decking in timber outbuildings.
Animal shelters and kennels: Moisture-resistant properties allow for use in sheltered exterior applications such as chicken coops and kennels when finished with appropriate timber treatments.
Installation Guidance
Allow for expansion: Leave a 3mm expansion gap between all board edges and a 10mm gap at rigid wall abutments to accommodate natural movement.
Stagger the joints: Lay panels in a "brick-bond" pattern across supports to ensure structural loads are distributed evenly across the frame.
Support all edges: Ensure every board edge is supported by a joist, stud, or noggin to prevent deflection and maintain a level surface.
Apply correct fixings: Secure boards using galvanised nails or screws at 150mm intervals along edges and 300mm intervals on intermediate supports.
Seal cut edges: Coat all field-cut edges with a high-quality water-resistant wood sealant immediately to prevent moisture ingress and edge swelling.
Orient boards correctly: Install the long axis of the board perpendicular to the supporting joists or studs for maximum structural spanning strength.
Protect from weather: Cover installed boards with a waterproof membrane as soon as possible if the structure is not yet fully weathered.
Fixing distance from edge: Ensure all fasteners are driven at least 10mm from the board edge to prevent breakout and maintain pull-through resistance.
Surface painting: Use a high-quality solvent-based primer or dedicated OSB sealer before applying topcoats to prevent strand swelling, as detailed in our comprehensive guide to painting OSB.
Compliance & Performance
Standard: EN 300 OSB 3 classification, verified for structural use in humid environments.
Certification: BBA approved for quality and compliance in construction.
Bonding: High-pressure, resin-bonded layers provide long-term durability and resistance to delamination.
Veneer quality: Free from internal knots and core voids, ensuring consistent structural integrity across the board.
Important note: Colour and finish are representative only and may vary slightly as this is a natural product. Always ensure proper ventilation if using in enclosed spaces, though this board is manufactured to E1 low-formaldehyde emission standards.
What Customers Are Saying
Customers rate this OSB3 board highly for its strength and versatility across DIY projects. One reviewer built an entire shed using it for walls, roof and floor, reporting excellent results after coating with wood protector. Others praise the fast delivery, accurate product descriptions, and competitive pricing. The board's structural integrity comes through strongly, with buyers confirming it performs well for flooring, wall sheathing, and general construction.
Summarised by AI from customer reviews.
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
Core Products
Core
ORDER VALUE
DELIVERY CHARGE
Under £300
ex. VAT
£30
ex. VAT
Over £300
ex. VAT
FREE
Core Delivery charges apply only when all products in an order that have equivalents are accepted as such. If even one product cannot be substituted with an equivalent, the entire order will not qualify for Core Delivery charges.
Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products
ORDER VALUE
DELIVERY CHARGE
Under
£300
£25
ex. VAT
Over
£300
ex. VAT
FREE
Express Delivery
Express Delivery - Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products
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.
Sturdy, well-made board at a fair price. Perfect for flooring projects.
Isla V on
Fast and efficient delivery! Boards were exactly as described, and the price was very reasonable.
Jim Pulley on
Fantastic quality OSB 3 board, quick delivery, and unbeatable price. Perfect for my project. Highly recommend!
Gene Hull on
I've been building myself a DIY shed from scratch and bought this to use as the walls, roof and floor. It's great stuff and really strong. I'm no expert on this stuff, but it's done a great job for me. I just coated it in wood protection paint, stuck rubber felt on the roof and put some lino on the floor so should last a good few years! Great price as well.
Rob Woods on
Excellent boards at an affordable price. Held up great during installation. Definitely buying again!
No, 11mm OSB3 is generally not strong enough for structural flooring or loft boarding. It is too thin to support the weight of people or furniture and will likely sag or snap between the joists.
18mm+ is a better option for flooring.
Can I waterproof OSB3?
You can make OSB3 highly water-resistant, you cannot make it truly "waterproof" for long-term submersion or permanent exposure to the elements.
Can 11mm OSB3 be used outside?
OSB3 is "moisture-resistant" rather than "waterproof," meaning it can handle humid conditions but will swell and rot if left exposed to direct rain or standing water for long periods.
If you want to use it outside it needs to have the edges sealed and covered with a waterproof layer, e.g. felt, shingles or cladding.
can you supply in 900 width by 2440 length?
Thank you for your enquiry. Unfortunately, these are only available in full sheet sizes.
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