Why choose Metsä Spruce Plywood 18mm

18 mm Plywood Metsä Spruce is a high-quality structural sheet material widely used in roofing,
leadwork and general construction. Manufactured from sustainably sourced spruce veneers, this plywood provides
a stable, strong and reliable substrate for roof coverings, lead sheet installations and structural decking
where dimensional consistency and fixing performance are critical.

In roofing and leadwork applications, substrate quality is fundamental. Poor-quality boards can lead to
deflection, joint telegraphing and premature failure of coverings. Metsä Spruce Ply offers consistent thickness,
good screw-holding capacity and a smooth surface suitable for use beneath lead, membranes and insulation systems.

Key benefits

• Structural performance: 18 mm thickness provides strength and stiffness for roofing substrates.
• Dimensional stability: Engineered spruce veneers reduce movement and warping.
• Leadwork ready: Suitable as a deck beneath sheet lead and associated membranes.
• Good fixing retention: Reliable screw and nail holding for roofing and carpentry works.
• Trade trusted: A dependable board for new build and refurbishment projects.

Where 18mm Spruce Plywood is used

This plywood is commonly specified for roof decking, dormer construction, flat roof substrates, eaves details
and areas receiving lead coverings. It is equally suitable for structural flooring, wall sheathing and general
construction where a strong, consistent sheet material is required.

Good practice & workmanship

Substrate preparation is critical to the performance of any roof covering. Boards should be securely fixed,
adequately supported and installed with appropriate expansion gaps. In leadwork applications, the substrate
must be smooth, continuous and capable of supporting thermal movement without distortion.

For authoritative guidance on substrates and best practice detailing, refer to
BS 6229 substrate guidance,
the industry overview at
The Lead Handbook,
and practical commentary on workmanship standards from
Neal Roofing.

At a glance — 18mm Metsä Spruce Ply

Always follow project specifications and relevant standards. Ensure boards are fixed and detailed to allow for
movement and long-term durability.