OSB Board

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OSB (Oriented Strand Board) is a type of engineered wood formed by adding adhesives and then compressing layers of wood strands in specific orientations. Available in a variety of sizes, OSB3 is a strong, versatile board suitable for structural use in humid conditions (service Class 1 and 2). Ideal for roofing, flooring, hoarding and wall sheathing.

Collection & Delivery

Collect your order from our yard here in Bristol or have it delivered with our own ULEZ-compliant fleet. We cover a wide range of postcodes and aim to deliver within 7–10 working days.

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Trade Accounts

Apply for a Fountain Timber Pay-As-You-Go Trade Account to unlock trade pricing and faster ordering. Open to verified trade customers — simply submit proof of trading to get started.

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OSB Board FAQs

Is OSB plywood?

No, OSB (Oriented Strand Board) is not plywood. OSB is made from compressed wood strands bonded together with adhesives, whereas plywood is made from thin layers of wood veneer glued together. Both are types of engineered wood but have different manufacturing processes and properties.

Is OSB waterproof?

OSB is water-resistant but not completely waterproof. Higher grades like OSB/3 and OSB/4 are designed to handle moisture better and are suitable for humid conditions. However, for outdoor use, additional sealing or a waterproof topcoat is recommended to protect against prolonged exposure to water.

What holds screws better, OSB or plywood?

Plywood generally holds screws better than OSB. This is due to its cross-layered veneer construction, which provides superior screw-holding strength compared to the compressed wood strands in OSB.

How long does OSB last?

OSB panels can have a long lifespan, ranging from 30 to 60 years, depending on the quality and how well they are maintained. Proper installation and protection from excessive moisture can significantly extend the lifespan of OSB.

Can OSB boards be used outside?

Yes, OSB can be used outside, particularly grades OSB/3 and OSB/4, which are designed to withstand moisture and humidity. However, it is important to seal and protect OSB from direct water exposure to prevent swelling and degradation over time.

What are the advantages of using OSB?

OSB is strong, cost-effective, and available in large sizes. It is also more water-resistant than plywood and can be eco-friendly, using wood from fast-growing trees and minimising waste. OSB is versatile, used in applications such as flooring, roofing, wall sheathing, and more.