OSB 3 Board - TG4 2400mm x 600mm (Tongue & Groove)

Product Overview

Ideal for customers looking for dependable timber material, OSB 3 Board - TG4 2400mm x 600mm (Tongue & Groove) combines practical performance with straightforward use, while our wider timber wood selection covers a variety of complementary project needs. The OSB 3 Board – TG4 2400mm x 600mm (18mm) is a durable, high-strength, tongue and groove structural panel designed for use in flooring, roofing, and general construction. Engineered for reliability and ease of installation, this board features a TG4 (tongue and groove on all four sides) profile that ensures a tight, seamless fit between panels — reducing movement, eliminating gaps, and improving overall stability. Manufactured from compressed layers of wood strands bonded with waterproof resin, this 18mm thick OSB 3 board provides excellent load-bearing performance and resistance to moisture, making it ideal for use in humid environments.

Features and Benefits

Precision TG4 Profile – The tongue and groove edges allow for fast, secure installation and a smooth, level surface finish. Moisture-Resistant – Suitable for use in structural applications within humid or damp conditions, such as floors and roofs. High Strength and Stability – The engineered construction ensures consistent density, excellent load distribution, and long-lasting performance. Sustainable Material – Made from responsibly sourced timber, offering an environmentally conscious alternative to traditional plywood. Easy to Work With – Can be sawn, drilled, screwed, or nailed using standard woodworking tools.

Applications

The OSB 3 TG4 18mm board is widely used across both professional and DIY construction projects, including: Flooring and subflooring Loft and attic flooring Roofing decks and sheathing Timber frame construction General structural applications Its robust tongue and groove design ensures stability and strength, even under heavy foot traffic and structural loads.

FAQs

1. What does TG4 mean?

TG4 stands for **Tongue and Groove on all four edges**. This interlocking design helps each board connect securely to the next, creating a tight, stable fit and reducing movement once installed.

2. Can OSB 3 TG4 be used for flooring in humid areas?

Yes. OSB 3 TG4 is specifically engineered for **load-bearing use in humid or damp environments**, making it suitable for floors in kitchens, bathrooms, and loft spaces with proper ventilation.

3. Do I need to leave a gap between boards when fitting?

Because of the **TG4 interlocking design**, the boards naturally maintain the correct spacing when joined. However, it’s recommended to leave a small expansion gap around the perimeter of the room to allow for natural movement.

Check out our other products here.

Explore more from our range here.

At JJ Building Materials, we're committed to supplying quality building products at competitive prices, backed by the service and expertise you'd expect from an established independent merchant. Whether you're a trade professional managing large-scale projects or a homeowner taking on a DIY renovation, we're here to help you find the right products for the job.

As part of the JJ Roofing Supplies Group, we build on decades of experience supplying construction materials across the UK. We've expanded beyond roofing to offer a growing range of building materials, including timber, insulation, landscaping products, plumbing supplies, flooring, doors, bricks, fencing, garden buildings and much more – all available to order online with nationwide delivery.

We work with many of the industry's leading manufacturers to bring you trusted products that meet the highest standards of quality and performance. Our team is passionate about providing excellent customer service, competitive pricing and a straightforward shopping experience from start to finish.

When you shop with JJ Building Materials, you can expect:

• Competitive prices on leading brands and quality products.
• Nationwide delivery across the UK
  
• A constantly expanding range of building and landscaping materials.
  
• Friendly, knowledgeable customer support.
  
• A trusted business backed by the JJ Roofing Supplies Group.
  

Every order is personally reviewed by our experienced team to ensure everything is correct before dispatch. We offer delivery from as little as the next working day on selected products, so please refer to the dark blue Estimated Delivery box above for the expected delivery timeframe for this item.

We work with trusted manufacturers and specialist delivery partners to ensure your order arrives safely and on time. You'll receive tracking details once your order has been dispatched, and if we need to confirm any delivery details, one of our team will contact you directly to keep everything running smoothly.

Roof Tiles & Fittings:

We recommend ordering an additional 10% of roof tiles to allow for any breakages that may occur during delivery or handling. Roof tiles are naturally fragile, and having a few extra on site helps prevent delays and ensures your roofing project can be completed without interruption.

Multiple Products from the Same Supplier

If you're ordering multiple products from the same supplier, your order will be dispatched together once all items are ready. This means the longest lead time will apply.

If you need part of your order sooner, please call us on 01202 113233. We can arrange a split delivery, although an additional shipping charge will apply.