What is an open-joint cladding system?

Open-joint (or open-rainscreen) cladding uses boards with deliberate gaps between them (typically 8–15 mm), backed by a UV-stable breather membrane. Water that penetrates the joints drains down the membrane face and exits at the base.

Open-joint (or open-rainscreen) cladding uses boards with deliberate gaps between them (typically 8–15 mm), backed by a UV-stable breather membrane. Water that penetrates the joints drains down the membrane face and exits at the base. Open-joint systems require no sealants, allow maximum ventilation behind the cladding, and create a distinctive shadow-line aesthetic. They are increasingly popular in contemporary architecture.

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

Related questions

• What is the best timber species for external cladding?
• How long does timber cladding last?
• Should timber cladding be installed horizontally or vertically?

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.