Sheathing Plywood Class 3 Exterior Grade 2440mm x 1220mm | 12mm or 18mm
Our Class 3 Exterior Grade Sheathing Plywood is a high-quality, structural panel suitable for external wall sheathing, roofing, flooring, and general construction. Manufactured to meet EN 636-3 standards, this plywood is designed for use in humid and external conditions, offering strength, durability, and reliable weather resistance when correctly installed and protected.
✅ Board Size: 2440mm x 1220mm (8ft x 4ft)
✅ Available thicknesses: 12mm and 18mm
✅ Class 3 rated — suitable for external structural use
✅ Manufactured from robust softwood or mixed hardwood veneers
✅ Ideal for roof decks, external walls, cladding backing boards, and site hoarding
This sheathing ply is intended for use behind weatherproof membranes or cladding systems and provides dependable structural performance under building standards.
🛠️ Typical Applications:
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Roof decking under felt, EPDM, or membrane systems
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External wall sheathing for timber frames
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Floor decking for temporary or permanent use
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Site hoardings and construction screens
✔️ Durable, versatile, and easy to cut and fix
✔️ Complies with EN 314-2 Class 3 glue bond
✔️ Suitable for projects requiring external-grade performance
✔️ Nationwide UK delivery available
🧠 Important Notes:
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Although Class 3 sheathing ply is rated for external environments, it must still be correctly installed with waterproof membranes or protective finishes to ensure maximum lifespan.
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Edges and cut surfaces should be sealed if exposed.