What is OSB Board? Uses, Types & Why It’s So Popular

OSB — short for Oriented Strand Board — is one of the most popular and cost-effective sheet materials in the building trade. Durable, versatile and easy to work with, OSB is used in everything from structural roofing and wall sheathing to garden builds and DIY projects.

At Wood Green Timber, we stock high-quality OSB3 boards including tongue & groove options, available in multiple thicknesses and lengths. We also offer a cut-to-size service, so you get exactly what you need with minimal waste.

What is OSB?

OSB is an engineered sheet made from wood strands compressed with resin into layers, with each layer oriented in a different direction (hence the name). This cross-directional structure gives OSB strength and stability across the sheet, making it a great alternative to plywood — especially for structural applications.

It’s manufactured to tight tolerances, meaning you get consistent sizing, no internal voids, and good edge strength. It’s ideal for tradespeople, self-builders, and DIYers looking for a reliable, budget-friendly board.

What is OSB Used For?

OSB is used in all sorts of building and construction work. Here are some of the most common uses:

• Roof decking

• Wall sheathing and timber frame panels

• Flooring and subfloors

• Site hoarding and temporary fencing

• Sheds and garden structures

• Workbenches and garage lining

• General DIY and home projects

Its strength and stability make it suitable for load-bearing use (when using OSB3 grade), and it performs well in both domestic and light commercial settings.

OSB vs Plywood – What’s the Difference?

While OSB and plywood are often interchangeable, there are a few key differences:

• Price: OSB is usually more cost-effective than plywood

• Finish: OSB has a rougher surface, while plywood offers a cleaner grain

• Consistency: OSB has no voids or knots, and cuts evenly across the board

• Moisture Resistance: OSB3 is moisture-resistant, but plywood (esp. marine ply) offers better resistance in exposed environments

For structural use indoors or in covered areas, OSB3 is often the go-to. For more decorative or high-end work, plywood may be the better choice. Not sure? Just ask — we’ll help you choose what’s right for your job.

OSB Boards We Stock at Wood Green Timber

We supply:

OSB3 Standard Sheets

Strong, moisture-resistant and suitable for structural roofing, flooring, and general construction.

OSB3 Tongue & Groove

Perfect for flat roofs (including GRP systems), subfloors and shed bases — the interlocking edge gives a cleaner, stronger joint.

• Cut-to-size service available (sheet only)

• Trade and DIY customers welcome

• In stock and ready for same or next-day delivery

Why Choose OSB?

• Durable and cost-effective

• Easy to cut, fix and handle

• Moisture-resistant (OSB3 grade)

• Great for both trade and DIY use

• In stock now at Wood Green Timber

Need OSB Sheets for Your Project?

Whether you’re building a roof, lining a shed, or creating a new workspace, we’ve got the right OSB board for the job. Visit us in Wood Green or Potters Bar, or give us a call to check stock, place an order, or request a cut-to-size quote.

Same-day or next-day delivery available across North London and Hertfordshire.