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Structural OSB 3 Sterling Board 2440mm x 1220mm (8' x 4')

Structural OSB 3 Sterling Board 2440mm x 1220mm (8' x 4')

Free delivery over £300 on all timber sheets and boards.

£15.68 GBP
£15.68 GBP
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Upgrade your build with our premium OSB3 Structural Boards, engineered for strength, stability, and moisture resistance. Designed to meet EN 300 standards, these 8x4 sheets (actual size: 2440mm x 1220mm) are ideal for roofing, flooring, wall sheathing, sheds, and more.

Manufactured from cross-layered wood strands and bonded with water-resistant resin, OSB3 delivers consistent quality, excellent screw-holding, and a smooth finish for easier handling and faster installation.

Choose from 3 thicknesses to match your project requirements:

9mm OSB3 Structural Board – Lightweight & Versatile
Perfect for internal linings, shed walls, hoardings, van interiors, and general sheathing. The 9mm board is light and easy to cut, ideal for jobs that don’t require heavy load-bearing.

11mm OSB3 Structural Board – Balanced Strength
A popular mid-range option used in roofing, timber frame sheathing, garden buildings, and shelving. Offers excellent rigidity while staying easy to work with.

18mm OSB3 Structural Board – Heavy-Duty Performance
Built for strength. Ideal for subfloors, lofts, racking, worktops, and load-bearing construction. Provides a solid feel underfoot with minimal flex.

Specification 9mm OSB3 Board 11mm OSB3 Board 18mm OSB3 Board
Board Size 2440mm x 1220mm (8ft x 4ft) 2440mm x 1220mm (8ft x 4ft) 2440mm x 1220mm (8ft x 4ft)
Thickness 9mm 11mm 18mm
Material Engineered wood strands with resin binders Engineered wood strands with resin binders Engineered wood strands with resin binders
Grade OSB3 (Structural, EN 300) OSB3 (Structural, EN 300) OSB3 (Structural, EN 300)
Edge Type Square edge Square edge Square edge
Face Finish Smooth unsanded Smooth unsanded Smooth unsanded
Application Type Internal/External (non-decorative) Internal/External (non-decorative) Internal/External (non-decorative)
Moisture Resistance Yes – Suitable for humid conditions Yes – Suitable for humid conditions Yes – Suitable for humid conditions
Load Bearing Light-duty Medium-duty Heavy-duty
Typical Uses Hoarding, linings, signs, shed walls Roofing, sheathing, general construction Flooring, lofts, racking, worktops
Workability Easy to cut, screw, and nail Easy to cut, screw, and nail Easy to cut, screw, and nail
Certifications FSC® / PEFC certified (subject to supply) FSC® / PEFC certified (subject to supply) FSC® / PEFC certified (subject to supply)
Approx. Weight 16kg 20kg 30kg
Fixing Recommendations Screws, nails, or panel adhesive Screws, nails, or panel adhesive Screws, nails, or panel adhesive
Storage Advice Store flat & dry, away from moisture Store flat & dry, away from moisture Store flat & dry, away from moisture

 

Delivery Info:

Free Nationwide UK kerbside delivery available on OSB orders over £300.00. All boards are shipped safely via pallet or large-item courier. All prices include VAT. 

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How to purchase your OSB boards

  • Step 1 - Order Now

    Click the 'Add to cart now' button and securely checkout using one of our payment providers.

  • Step 2 - Receive Quickly

    We will deliver your product conveniently and insured within 5-10 working days.

  • Step 3 - Be Happy

    Enjoy your OSB Boards!

FREQUENTLY ASKED QUESTIONS

What is OSB3 and how is it different from regular OSB?

OSB3 (Oriented Strand Board Type 3) is a structural-grade board manufactured to EN 300 standards. Unlike standard OSB, OSB3 is specifically engineered for load-bearing use in humid conditions, making it suitable for roofing, flooring, and external sheathing where moisture resistance is essential.

Can these boards be used outside?

Yes, OSB3 boards are moisture-resistant and can be used in external applications such as sheds, hoardings, and roofing. However, if exposed directly to the elements (like rain), the boards should be sealed or painted and protected with appropriate waterproofing or cladding.

What’s the difference between 9mm, 11mm, and 18mm boards?


– Lightweight, ideal for linings, signs, van walls, and temporary hoardings.


– A good general-purpose board for roofing, shed walls, and sheathing.


– Heavy-duty strength for subfloors, lofts, racking, and permanent structures.

Check the comparison table above to see which thickness best suits your project.

Can I cut and drill OSB3 boards easily?

Yes. OSB3 is easy to work with using standard woodworking tools. It cuts cleanly, holds screws well, and can also be nailed or bonded with panel adhesive.

Are these OSB boards suitable for flooring?

18mm OSB3 is the most suitable thickness for flooring applications, including loft floors, subfloors, and decking. It offers the necessary rigidity and load-bearing capacity to prevent flexing or squeaking.

Do the boards come treated or unfinished?

The boards are untreated with a smooth, unsanded finish. If you're using them in an exposed area or for decorative purposes, we recommend priming, painting, or sealing the surface.

Is OSB3 eco-friendly?

Yes. Most OSB3 boards are FSC® or PEFC certified, meaning they are produced from responsibly sourced timber. Additionally, OSB production makes efficient use of wood strands and offcuts, making it more sustainable than some traditional plywoods.

How should I store the boards before installation?

Store OSB boards flat and dry, ideally indoors or under cover. Avoid contact with water and ensure adequate ventilation to prevent moisture absorption or warping.

Do you offer delivery and how are the boards packaged?

Yes. We offer nationwide kerbside delivery across mainland UK. Boards are securely packaged, typically palletised or wrapped, to ensure they arrive in top condition and ready for use on-site.

MONEY BACK GUARANTEE

Here at Rackerman, we take customer satisfaction very seriously. If you are unsatisfied with the quality of your product, please email us info@rackerman.co.uk or give us a call: 01665 497513 and we will make it right.

SHIPPING

It should take no longer than 1-2 business day to process your order, then 5-10 working days to then receive your order from us after dispatch.

If you haven't received your items in this time frame, please contact us.

RETURNS

If you are unsatisfied with your purchase, that's completely fine! We offer a 30 day money back guarantee to all customers, no questions asked! Please contact us to arrange a return.

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