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SKU: OSB18-2440x1220

18mm OSB3 Structural Board 2440mm x 1220mm (8x4)

(18)
9mm
11mm
18mm
£19.85 Ex VAT
£23.82 Inc VAT
£6.67 / m2
£8.00 / m2
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Specifications

Thickness: 18mm

Length: 2440mm

Width: 1220mm

Material: OSB

Lumber/Wood type: Oriented Strand Board

Description

18mm x 2440mm x 1220mm strand type OSB 3 board. A super versatile and cost effect particleboard which is often used as an alternative to softwood plywood.

  • Thickness: 18mm
  • Sheet Size: 2400mm x 1200mm
  • Performs reliably in dry, humid, and wet environments and it is suitable for house building, flat and pitched roofing, making it ideal for house building and construction.
  • Suitable sealers can be applied for additional moisture protection if required
  • Produced by cross-orienting and bonding strands of wood in layered sheets, utilising the whole log for optimum yield
  • Responsibly sourced from sustainably managed forestry resources

Please Note: Cut sheet sizes may vary slightly due to blade width loss during cutting. Due to variance in stock and manufacturers, final board dimensions may measure between 2400mm x 1200mm and 2440mm x 1220mm.

Looking for something specific?

You can always call us at 01156976800 or contact us via email at  sales@diybuildingsupplies.co.uk and our team will do their best to help.

Frequently asked questions
What is OSB3 and how does it differ from regular OSB or plywood?

OSB3 is a high-performance structural Oriented Strand Board designed for use in humid conditions. Unlike standard OSB (often OSB2), OSB3 is suitable for load-bearing applications in both dry and humid environments, such as roofing, flooring, and wall sheathing. It is a cost-effective alternative to softwood plywood, offering excellent strength and rigidity while being more affordable and sustainably produced.

What are the main uses for OSB3 boards?

9mm OSB3 is commonly used for:

  • Roof decking (flat and pitched roofs)
  • Wall sheathing
  • Flooring (especially as a subfloor)
  • General construction and renovation projects
    It performs reliably in a wide range of conditions and can be used in house building and structural applications.
Is this OSB board suitable for outdoor use?

Yes, OSB3 is suitable for humid conditions and temporary outdoor exposure. While it is not fully waterproof like exterior-grade plywood, it performs well in wet environments when properly sealed. For additional protection, we recommend applying a suitable sealer or covering the boards to prevent prolonged direct exposure to rain.

Large Order or Specific Requirement?

CALL OUR TEAM

0115 6976 800

Everything good
Everything good. Best price I could find and everything arrived on time.
Campbell, GB
Excellent
Based on 50 reviews
Everything good
Everything good. Best price I could find and everything arrived on time.
Campbell, GB
Excellent service
Excellent service, best prices by far. Would definitely use again.
Billy, GB
Amazing customer service Arrived within…
Amazing customer service Arrived within the timeframe given and friendly staff when dropped off
Bethany King, GB
Great all round
Great communication, products, excellent delivery
Bernhard PALMER, GB
Great supplier! Happy customer!
Absolutely amazing. I needed a few timbers cut to different sizes, and these guys sorted it all out for me. Very friendly, very helpful. Will definitely buy from again.
Ben Williams, GB
Professional, quality service
Great prices. I received a follow up phone call to clarify certain items. Delivery was on the day agreed and despite access difficulties, it all went very smoothly.
Ben McG, GB
Great service
Great service, easy to use and fast and friendly delivery.
Ben Coulson, GB
Great experience with DIY Building…
Great experience with DIY Building Supplies - website nice and easy to use, really good prices and the delivery was quick and accurate using a local supplier. Would definitely use again.
Ben, GB
Great service and product
Great customer service throughout ordering and delivery. Product was perfect. Would definitely use again and highly recommend.
Becky, GB
Quick delivery and very helpfull drivers.
Quick delivery and very helpfull drivers for these heavy sheets. Great service. Thank you.
Barry Hensall, GB
9mm
11mm
18mm