At Mitcham Builders Merchants, we supply a range of OSB boards ideal for structural and general-purpose use. Our stock includes high-quality OSB 3 board and tongue and groove (T&G) options, all available in a sturdy 18mm thickness and a variety of sizes to suit your project.

OSB board sheets are engineered by compressing layers of wood strands with adhesive, aligning each layer in a specific direction before bonding under heat and pressure. The result is a strong, cost-effective alternative to plywood, ideal for construction work that demands strength and durability.

Our OSB 3 boards are specifically designed for load-bearing applications, making them suitable for roofing, wall sheathing, and flooring in environments where moisture resistance is essential. If you're working on flat roof decking or need a secure fit for floors, our T&G OSB sheets offer a precise tongue and groove edge that locks panels in place quickly and easily.

Whether you're a contractor or a DIYer, you can order everything online with same-day or next-day delivery available, or visit our Croydon branch to browse in person. Our knowledgeable team is always happy to help if you're unsure about the best option for your project.

As South London’s largest independent builders’ merchant, we’ve got all your OSB board needs covered, along with everything else to keep your job moving.