Rainscreen Cladding System

Introduction

Malaysia's equatorial climate is hot, humid, and rainy year-round. This high rainfall often causes moisture-related issues in residential buildings, such as mould and paint failure. These problems typically stem from poor ventilation, inadequate moisture management, or wall leakage.

Therefore, effective moisture management is essential—not only in understanding where water originates, but also in determining how it is controlled, directed, and safely discharged from the building envelope.

Rainscreen system

A rainscreen wall is an effective wall system for managing water and moisture within the building envelope. It incorporates a cavity behind the outer cladding that allows water to drain away and promotes ventilation, helping the wall assembly dry more efficiently. This reduces the risk of prolonged moisture accumulation, which can contribute to mould growth and deterioration of interior wall finishes.

👉 Advantages of cladding facade:

🔹Proper water management

🔹Improve energy efficiency

🔹Reduce structural movement

🔹Low cost maintenance

🔹Available aesthetic choices

What can go wrong?

While the rainscreen concept is designed to help keep water away from the wall structure, the system can still fail if the connections and junctions are not carefully detailed.

Poor detailing can allow moisture to get trapped within the wall, potentially leading to long-term problems. Some common failures that can occur in a rainscreen system include:

🔹Blocked drainage path

🔹No proper ventilation

🔹Poor flashing details

🔹Incorrect joint/interfaces

🔹Water trapped inside the wall

A rainscreen isn't simply a layer of cladding with an empty cavity behind it.

Its performance comes from the entire system working together — from drainage and ventilation to joints, interfaces, installation and maintenance. Good facade design isn't just about keeping water out. It's about knowing how to manage it when it gets in.