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

URN: 4003002
Core
£16.89ex. VAT £5.67 per m2 Get it for £16.13 ex. VAT with CORE+
£16.89ex. VAT
£5.67 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

18mm Structural OSB 3 Sterling Board is a moisture-resistant, structural panel purposed for use in a variety of internal and external applications including roofs, floors and walls.

Express Delivery

Tue 8 Jul

Standard Delivery

Wed 9 Jul

Order by Monday at 2pm
  • 1days
  • 20hrs
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Product Overview

18mm Structural OSB 3 Sterling Board is a moisture-resistant, structural panel purposed for use in a variety of internal and external applications including roofs, floors and walls.

URN: 4003002
£16.89ex. VAT

Delivery & Returns Information

All delivery charges are shown in your basket and are dependent on the total value of items in your basket based on product category.

This charge is based on delivery to mainland UK excluding the following postcodes: AB, CF, DD, DG, KW, IV, LD, LL, NP, PH, SA and SY. If your delivery address is in any of these postcode areas a member of our customer service team will contact you prior to processing your order should an additional delivery charge apply. We do not offer deliveries outside the UK mainland.

Standard (Nationwide) Delivery

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Core
ORDER VALUE DELIVERY CHARGE
Under £300 ex. VAT £25 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
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Under £100 £20 ex. VAT
Between £100 - £250 ex. VAT £15 ex. VAT
Over £250 ex. VAT FREE
Insulation, Plasterboard and Drylining Products
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Under £150 £50 ex. VAT
Between £150 - £400 ex. VAT £35 ex. VAT
Over £400 ex. VAT FREE
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Each item £10 ex. VAT
Over £350 ex. VAT of 1 brand FREE
Screws & Fixings and Adhesives & Sealants
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Over £100 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}} Use in a variety of structural applications
  • {{water_drop}} Versatile and moisture resistant
  • {{construction}} Used extensively in renovation work and new projects
  • {{keyboard_arrow_right}} Stronger than chipboard products and non-structural plywoods
  • {{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)


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

What Is 18mm OSB?

18mm OSB 3 is a precision-engineered board manufactured by bonding multiple layers of cross-oriented wood strands with a moisture-resistant resin under high heat and pressure. This process creates a structurally robust panel with exceptional dimensional stability and load-bearing capacity. 

Its 'OSB 3' designation, defined by the BS EN 300 standard, confirms its suitability for load-bearing use in humid conditions. This makes it an ideal material for structural sub-flooring, where its strength supports heavy loads, and as roof decking, where its rigidity spans rafters while resisting ambient moisture. 

Its cross-oriented build provides the racking strength required for wall sheathing in timber-frame construction, preventing twisting under wind load. The board's durability also makes it a reliable choice for secure site hoarding, capable of withstanding prolonged exposure to the elements.


Applications

18mm OSB 3 is a versatile panel for demanding projects. Its load-bearing capacity and moisture-resistant properties make it the ideal choice for a wide range of interior and exterior structural applications.


Recommended Applications:

  • Structural Work: The industry standard for roofing, flooring, and wall sheathing, where rigidity and strength are essential.
  • Garden Buildings: Creates robust and weather-resistant floors, walls, and roofs for sheds, workshops, and summer houses.
  • Commercial & Retail Fit-Outs: Suitable for building heavy-duty shelving, racking, and exhibition stands designed to support significant weight.
  • Site Hoarding: A durable and secure solution for long-term projects, capable of withstanding prolonged exposure to the elements.


Benefits

  • Easy to drill, nail, file and sand 
  • Suitable for interior and exterior applications
  • BBA classification permits use in a wide range of commercial and domestic situations
  • Used extensively in renovation work and new projects
  • Stronger than chipboard products and non-structural plywoods
  • Manufactured to EN 300 performance standards
  • BBA approved
  • Standard boards have consistent dimensions of 2440 x 1220 (or 8ft x 4ft)


Moisture Resistance

18mm OSB 3 is engineered to offer superior performance in humid environments, setting it apart from interior-grade panels like MDF or the dry-condition-only OSB 2. 

However, it is important to distinguish that "moisture-resistant" does not mean waterproof. For permanent outdoor installations where the board will be exposed to the elements, applying additional protection is essential. 

To waterproof the board effectively, coat it with a quality exterior paint followed by a wood waterproofing sealant. Allow 12-24 hours for the first coat to dry completely before installing the board or applying a second coat if needed.

OSB Meaning

'OSB' stands for Oriented Strand Board, a name that directly reflects its composition. The 18mm OSB panel is engineered by compressing layers of oriented wood strands together with a high-performance adhesive resin.

Customer Reviews

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4
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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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