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Smartply Max 18mm OSB3 Board - 2400mm x 1200mm

Inc Vat £30.30
RRP £34.54
In Stock - 20+ Available
Estimated Delivery: 5 - 7 Working Days
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Product Description

SmartPly Max 18mm OSB3 is a strong, load-bearing sheet designed for structural jobs such as roofing, flooring, wall sheathing and timber-frame construction. Its OSB/3 rating means it can be used in humid conditions, making it a practical choice for areas where standard dry-use boards may not be suitable. The 18mm thickness provides a sturdy, stable panel for demanding applications, while its high racking strength helps add rigidity to framed structures. SmartPly Max is made from layers of carefully oriented softwood strands bonded together to create consistent strength and dimensional stability across the sheet. The timber is FSC® certified, and the board is manufactured using no added formaldehyde resin, giving you a responsibly sourced structural panel that's suitable for a wide range of building and renovation work.

Why Choose the Smartply Max 18mm OSB3 Board

  • Its OSB/3 classification makes it suitable for load-bearing applications in humid conditions.
  • The versatile 18mm sheet can be used for roofing, flooring, wall sheathing and timber-frame projects.
  • Its high racking strength helps provide rigidity and support within framed walls and structures.
  • Layers of oriented wood strands give the board reliable strength and dimensional stability.
  • Its moisture-resistant construction makes it suitable for internal and protected external applications where humidity may be present.
  • The board is manufactured using FSC® certified timber from responsibly managed sources.
  • It is made using no added formaldehyde resin, making it a practical option for indoor building projects.
  • Its engineered construction provides consistent panel quality without the knots and natural voids commonly found in solid timber.
  • SmartPly Max is UKCA and CE marked and manufactured to recognised structural panel performance standards.

Have a Question About the Smartply Max OSB3 Board?

If you’d like a second opinion before you buy, call our UK-based team on 01295 565 565. Or ask Lee, our AI assistant in the lower right, for quick answers to common questions and product details.



Product Specifications

View as Feet & Inch
More Information
SKU10268987
Thickness18 mm
Overall Length2400 mm
Overall Width1200 mm

Install Guides

Delivery Information

We understand that ordering products online can be daunting, especially when ordering roofing materials. It is for this reason that we make our delivery processes as simple as possible for you. However, there are a few things to know about our delivery processes. These include:

  • When placing an order, you’ll see a breakdown of your delivery charge in your shopping cart. These charges are for the UK mainland only, and additional charges may apply for Northern Ireland, the Scottish Highlands and other regions.

  • Deliveries only take place on working days (Mon - Fri) and do not take place on Bank Holidays. 

  • You’ll find an estimated delivery on the majority of product pages below the 'Add to Basket' button. Whilst we aim to deliver your items within the estimated delivery, it is only an estimate. 

  • You're able to select a preferred delivery date in your shopping basket. Whilst we aim to deliver your items on this date, it is not guaranteed.
  • Orders placed after 12pm, during the weekend, and on a bank holiday will not be processed until the next working day. Please consider this when placing your order as it may impact your delivery date.

  • After you’ve placed your order, you’ll receive an order confirmation by email outlining the details of your order. Please check your order confirmation email and inform us of any mistakes or errors immediately.

  • Shortly after receiving your order confirmation you’ll receive a separate email confirming the planned delivery date.

  • We can only provide a delivery date and are not able to confirm the time delivery will be attempted. Therefore, we ask that somebody is able to accept and sign for your items throughout the started delivery date.

  • If you are unable to accept and sign for an order, it can be left in a safe location in most circumstances. Please email [email protected] if you would like an item to be left without a signature. 

  • Whilst we aim to hold the majority of our products in stock, due to the vast number of products we offer this is not always possible. Because of this we are required to send your items directly from the manufacturer on a small number of occasions, at which point a different delivery charge may apply as standard.  

  • On occasions the items ordered may be shipped from different depots, which could result in seperate deliveries taking place.

If you have more questions about our products or delivery, please contact our team online or by telephone.

Refund Information

We understand mistakes can be made and we therefore keep our cancellation and returns policy as simple as possible. However, there are a few things to know about cancelling an order or returning an item. These include:

Items Not Required

Should you no longer require an item, you have the right to cancel within 14 days of delivery unless the items are custom made. You needn’t give us reason for cancelling your order but will be required to notify us by email. Once notified we will provide an address for the items to be returned to and arrange the necessary refund.

Faulty or Damaged Items

On the rare occasion that an item is delivered faulty or damaged, we will exchange it or provide a refund. We must be notified by email as soon as possible and may require images. To avoid such an issue, we ask that customers do not sign for damaged goods.

Custom Made Items

A handful of items are ‘Custom Made’. This means they are typically manufactured to the specifications provided by you and are therefore non-refundable. This is unless they are deemed to be faulty or damaged at the time of delivery, at which point you should notify us by email as soon as possible.

Further Information

For further information on cancellations, returns and refunds please read our full policy by clicking here. This confirms any other requirements to consider (i.e. packaging), fees that may be charged (i.e. admin charges) and our policy for businesses.