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Sheathing Plywood Class 3 Exterior Grade 2440mm x 1220mm | 12mm or 18mm

Sheathing Plywood Class 3 Exterior Grade 2440mm x 1220mm | 12mm or 18mm

£0
£26.04 - £35.34
£26.04
£26.04 - £35.34
£26.04

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:

  • Roof decking under felt, EPDM, or membrane systems

  • External wall sheathing for timber frames

  • Floor decking for temporary or permanent use

  • 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:

  • 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.

  • Edges and cut surfaces should be sealed if exposed.
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Marc Scott
April, 2025
Very handy having such a well stocked yard so close to my home, the staff are all very knowledgable and always keen to help and prices are good. ⭐️⭐️⭐️⭐️⭐️ operation 👌. - scotbeds
Ryan McGowan
March, 2025
sales girl Leighsa was really helpful with fast delivery
D
March, 2025
Outstanding customer care. I placed a small order (60£ timber) from Fife and paid with Apple Pay. Unfortunately the site defaulted to their normal own delivery service which is for an unlimited volume so good value for larger orders, but would have been too expensive for a small order like mine. I hadn’t seen this until the order went through (entirely my fault). I had thought to cancel and the weekend office team were very kind and understanding about this. We agreed I would call them in the week to arrange this. But Alan and the Alter team phoned me back a day later and said they had researched courier costs and would be happy to do that instead - which saved a huge amount of hassle on a product that was out of stock in most places locally and made the whole order very reasonable. They also refunded me the difference. Way above and beyond for a small customer - can’t recommend them enough and will be using them for more timber needs in the future.
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