Does timber cladding need a ventilated cavity?

Yes. All timber cladding systems require a ventilated cavity (minimum 25 mm, preferably 38–50 mm) between the cladding and the weather-resistant barrier.

Yes. All timber cladding systems require a ventilated cavity (minimum 25 mm, preferably 38–50 mm) between the cladding and the weather-resistant barrier. This cavity allows moisture that penetrates the cladding to drain and evaporate, preventing rot in the structural wall behind. Ventilation openings at top and bottom (minimum 1,500 mm²/m run) ensure continuous airflow. Omitting the ventilated cavity is the single most common cause of premature cladding failure.

Why this matters

This question relates to Timber Cladding Systems: Types, Profiles & Specification Guide, 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:

→ Timber Cladding Systems: Types, Profiles & Specification Guide

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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.