OSB Board Class 3

​All prices are subject to VAT

OSB Board Class 3 – 8x4 Sheets in Chelmsford & Across Essex

At J Gard & Sons Ltd, we supply high-quality OSB Board Class 3 (OSB 3) in standard 8ft x 4ft sheets, available in 11mm and 18mm thicknesses. Ideal for structural and general building applications, our OSB boards are trusted by trade professionals and DIY customers across Chelmsford and throughout Essex.

Manufactured from compressed wood strands bonded with high-performance resins, OSB 3 boards provide excellent strength, rigidity, and moisture resistance - making them a reliable and cost-effective alternative to plywood.

Whether you're working on flooring, roofing, wall sheathing, or interior partitions, our OSB sheets deliver dependable performance at competitive prices.

Available Sizes

• 8' x 4' OSB Board – 11mm

• 8' x 4' OSB Board – 18mm

Bulk discounts available on 20+ sheets.

What is OSB 3 Board?

OSB (Oriented Strand Board) is an engineered structural wood panel made from layers of oriented wood strands bonded with waterproof adhesives.

OSB 3 is specifically designed for load-bearing applications in humid conditions, making it suitable for roofing decks, flooring, and wall construction.

Suitable Applications

Our OSB Board Class 3 is commonly used for:

• Structural flooring and subfloors

• Roof decking and sheathing

• Wall sheathing

• Timber frame construction

• Garden rooms and outbuildings

• Interior partitions

• DIY projects and furniture builds

Is OSB Waterproof?

OSB 3 boards are moisture-resistant but not waterproof.

They can be used in exterior structural applications such as roofing or sheathing, provided:

• Edges are sealed

• Boards are protected from continuous water exposure

• Proper ventilation is maintained

For permanent outdoor exposure, alternative materials may be required.

OSB Board Suppliers in Essex

We supply OSB board across: Chelmsford, Braintree, Witham, Maldon, Brentwood, Colchester, Basildon, Southend and surrounding areas.

If you’re searching for “OSB board near me” in Essex, we offer competitive trade pricing with fast, reliable local delivery - or collection direct from our Chelmsford yard.

Cutting Service Available

We offer precision cutting on most sheet materials:

• £0.60 per cut

• Multiple cuts priced on request

• Contact us for complex cutting requirements

Why Choose Gards for OSB Board?

• High-quality OSB 3 sheets
• Competitive trade pricing
• Bulk discounts available
• Reliable Essex delivery service
• Collection from our Chelmsford yard
• Trusted local supplier

Whether you need a single sheet for a DIY project or bulk quantities for a building site, we keep regular stock to keep your project moving.