What is the minimum ventilation gap behind sauna cladding?

A minimum 20mm ventilation gap between the vapour barrier and the back of the cladding is recommended to allow air circulation and prevent moisture accumulation. Cladding is fixed to timber battens (typically 22×50mm or 25×50mm) which create this gap.

A minimum 20mm ventilation gap between the vapour barrier and the back of the cladding is recommended to allow air circulation and prevent moisture accumulation. Cladding is fixed to timber battens (typically 22×50mm or 25×50mm) which create this gap. Battens should be spaced at maximum 600mm centres.

Why this matters

This question relates to Sauna Interior Design: Timber Species, Profiles & Best Practice, which covers the broader topic in detail. Understanding this specific aspect helps architects, builders, and timber dealers make informed specification decisions.

For full context and additional technical detail, see our comprehensive guide:

→ Sauna Interior Design: Timber Species, Profiles & Best Practice

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About this answer

This answer is part of the PuurModulair Knowledge Base — comprehensive timber specification guidance for architects, builders, and dealers across the UK, EU, and Scandinavia.