Alder Sauna Cladding Shadow Gap 15×90mm

Alder sauna cladding 15×90mm with a shadow gap profile is designed for high-performance use in sauna wall and ceiling cladding. Selected for its low resin content, smooth texture, and consistent tone, alder is a premium sauna timber widely used in both residential and commercial sauna installations across the UK.

The shadow gap profile creates a refined linear appearance, adding depth and definition to sauna interiors while maintaining a clean, modern finish. With a 15mm thickness and 90mm face width, this cladding provides a lightweight yet stable solution for internal sauna environments where precision and visual consistency are essential.

This product forms part of our wider sauna timber and cladding range. For seating areas, use dedicated sauna bench boards designed for comfort under heat.

Key Features

• Profile: Shadow gap sauna cladding
• Size: 15×90mm
• Material: Alder sauna timber
• Finish: Smooth planed surface
• Use: Sauna wall cladding and ceiling lining

Why Use Alder for Sauna Cladding

Alder is a preferred material for sauna cladding due to its stable performance in high-temperature environments and its smooth, comfortable surface. It remains consistent under heat exposure, making it suitable for long-term use in sauna interiors.

• Low resin content – suitable for sauna environments
• Smooth, knot-minimal surface for a clean finish
• Warm, even colour tone across boards
• Comfortable surface temperature under heat

Installation Guidance

Alder sauna cladding boards should be installed onto a timber batten system with a ventilated cavity behind to support airflow and stability. Suitable for both vertical and horizontal installation depending on design requirements.

• Recommended batten centres: 400–600mm
• Use stainless steel fixings for durability
• Allow for natural timber movement

Applications

• Sauna wall cladding
• Sauna ceiling cladding
• Internal spa and wellness rooms
• Dry heat environments

Important Information

• For internal sauna use only
• Natural variation in grain and colour is expected
• For seating applications, use dedicated sauna bench boards