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18mm Structural OSB 3 Sterling Board 2440mm x 1220mm (8' x 4')

URN: 4003002
Core
£17.50ex. VAT £5.87 per m2 Get it for £16.71 ex. VAT with CORE+
£17.50ex. VAT
£5.87 per m2
Coverage required
m
m
Based on your total area of m2 (inc. 10% wastage) - of these are required (actual coverage of m2)

We recommend purchasing at least 10% extra product to allow for errors, damages or obstacles

Structural OSB 3 board for load-bearing use in humid conditions. Suitable for roofing, flooring, and wall sheathing. 18mm thickness delivers durability for heavy floors, robust roofs, and demanding applications.

Express Delivery

Tue 16 Sep

Standard Delivery

Wed 17 Sep

Order by Monday at 2pm
  • 2days
  • 4hrs
  • 45mins
  • 25secs

Delivery & Returns Info

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Product Overview

Structural OSB 3 board for load-bearing use in humid conditions. Suitable for roofing, flooring, and wall sheathing. 18mm thickness delivers durability for heavy floors, robust roofs, and demanding applications.

URN: 4003002
£17.50ex. VAT

Delivery & Returns Information

How Our Delivery Works

We work with a nationwide network of trusted suppliers. As a result, items in your basket may be supplied by different suppliers and delivered separately. Where this applies, you'll see multiple delivery charges at checkout. We always aim to group products from the same supplier to keep delivery costs as low as possible.

Delivery Areas & Charges

Delivery charges listed on our website apply to mainland UK, excluding the following postcode areas: AB, CF, DD, DG, FK, KW, IV, LA, LD, LL, NP, PA, PH, SA, SY
If your delivery address falls within one of these postcode areas, we’ll be in touch before processing your order to confirm any additional delivery costs.
Please note: We do not currently offer delivery outside the UK mainland.

Standard (Nationwide) Delivery

Core Products
Core
ORDER VALUE DELIVERY CHARGE
Under £300 ex. VAT £20 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 £100 £15 ex. VAT
Between £100 - £300 ex. VAT £10 ex. VAT
Over £300 ex. VAT FREE
Insulation, Plasterboard and Drylining Products
ORDER VALUE DELIVERY CHARGE
Under £350 £35 ex. VAT
Over £350 ex. VAT FREE
Screws & Fixings and Adhesives & Sealants
ORDER VALUE DELIVERY CHARGE
Under £50 £5 ex. VAT
Over £50 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
Express Delivery - Insulation and Plasterboard & Drylining
ORDER VALUE DELIVERY CHARGE
Under £400 £50 ex. VAT
Over £400 ex. VAT £35 ex. VAT

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Returns

We offer a 30 day returns policy on any faulty products.

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Key Features

  • {{foundation}} Used in a variety of structural applications
  • {{water_drop}} Offers load-bearing performance in humid conditions
  • {{workspace_premium}} Manufactured to EN 300 performance standards
  • {{verified_user}} BBA approved

Technical Specification

Technical Specification
Bond Class:BS EN300
Thickness:18mm
Width:1220mm
Length:2440mm
Sales Unit:Sheet
Sales Unit Coverage:2.98m2
Weight:28kg
Application:Roofs & walls
Edge:Square
Country of Origin:Latvia
Grade:OSB3
Wood Species:Pine / Spruce
Formaldehyde Level:E1 (low)

Product Overview

Structural OSB 3 Sterling board, measuring 2440mm x 1220mm (8' x 4') with an 18mm 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 heavy flooring, robust roofing, and demanding joinery or construction work.

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.
  • Moisture performance: Reliable in humid environments, unlike OSB 2 (dry-use only).
  • 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 18mm: Heavy-duty board for flooring, roofing, and high-load applications.


Please Note: Colour and finish are representative only and may vary slightly as this is a natural product.

Applications

  • Heavy flooring: Provides strength for domestic and commercial floors.
  • Roof decking: Robust panels for long-term roof performance.
  • Wall sheathing: Adds rigidity and resistance to timber frames.
  • Site hoardings: Strong and moisture-resistant for secure barriers.
  • High-load structures: Suitable for platforms, staging, and demanding builds.
  • DIY and carpentry: Ideal for benches, shelving, and heavy joinery projects.

Installation Guidance

  • Seal cut edges when exposed: Prevents moisture ingress.
  • Use correct fixings: Galvanised or stainless fasteners recommended.
  • Install on 600mm or 400mm centres: Ensures secure fixing and structural support.
  • Add exterior protection if required: Apply paint or sealant for permanent outdoor use.

Compliance & Performance

  • Standard: EN 300 OSB 3, for structural use in humid conditions.
  • Certification: BBA approved.
  • Bonding: Resin-bonded, hot-pressed layers for durability.
  • Veneer quality: Free from knots and voids.



Customer Reviews

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4
3
2
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5/5 based on 15 reviews

I used these in a shed build. The boards were level and delivered to me on time.

Mark Evans on

Really pleased with the quality of these boards

Ken Heelings on

The service from Ciara was amazing from start to finish

Dave K on

All boards arrived in good condition, and the price was cheap.

Harry Jones on

Arrived on time and I would recommend them to anyone

Jemma Granger on

I'd recommend Materials Market. I had a positive experience, bought at good prices and the boards were a good spec.

Kate Ryman on

Managed to order these on short notice and I was really impressed with the quality of the boards. I'll be ordering from them again

Kieron Pratt on

I ordered these for my carpenter, the service was great - a big thank you to Ciara for arranging my order.

Sally Hall on

Great service and good quality boards that arrived, really happy all round

Ty Vine on

The boards arrived in a good condition. I used them in a shop for a big flooring project I had.

Jay L on

great for sub-floors

Kyle Rittenhouse on

good

Isaac Crandley on

Great price, and my dog loves the new bed I made using it.

Martin Chivers on

great

Lee O'Mann on

excellent

Ian Duncan on

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