For quantity surveyors evaluating building materials during the preliminary or beginning stage of a project, understanding the advanced functions of rainscreen cladding is essential. Among the most effective and widely adopted systems is the drained and ventilated rainscreen cladding system. This design not only enhances a façade’s defence against environmental challenges but also supports long-term durability, thermal efficiency, and compliance with modern construction standards.
This article explores what drained and ventilated rainscreen cladding is, how it works, and the benefits it offers while guiding you through its application in modern building designs.
Rainscreen cladding systems are designed to be external layers of protection for buildings, acting as a shield against wind-driven rain and other environmental factors. Typically mounted onto a sub-frame that is securely fixed to the building’s main structure, these systems use a combination of performance with design flexibility, offering both functional resilience and architectural versatility.
To cater to diverse architectural designs and operational requirements, rainscreen cladding systems utilise a range of materials. Common materials include:
It’s often aesthetics that govern the choice. However, in some instances, the choice is influenced by factors like longevity, durability, and weatherproofing. For example, aluminium is resistant to corrosion, while being versatile enough to create almost any design.
A drained and ventilated rainscreen cladding system provides an additional level of façade protection. The ventilated cavity behind the external cladding serves multiple functions:
Advanced engineering underpins every drained and ventilated system. It combines a weather-resistant outer skin separated from the insulated wall by a cavity to control airflow. This cavity acts as a pressure equalisation chamber, allowing air to circulate freely and reducing water penetration. The equalised pressure prevents wind-driven rain from being forced through the outer layer. If small amounts of moisture do pass the rainscreen, the cavity ensures it is drained away efficiently, keeping the internal wall dry. The combination of ventilation, drainage, and pressure equalisation is what gives rainscreen cladding its resilience and reliability.
The advantages of drained and ventilated rainscreens are clear. By effectively managing moisture, these systems prevent water from penetrating into the structure, protecting both the insulation and the primary wall. The ventilated cavity also provides pressure equalisation, resisting wind-driven rain and ensuring the façade remains resilient even in extreme weather. Crucially, the insulation layer is kept dry and stable, which helps maintain thermal performance over time. This design reduces the risk of material degradation, extending the lifespan of the façade and lowering lifecycle maintenance costs. In addition, drained and ventilated rainscreens align with best practice in building envelope design, providing assurance of compliance and reducing long-term risk for contractors, clients, and project stakeholders alike.
At Advanced Glass, we’re committed to delivering cutting-edge rainscreen cladding systems tailored to your unique requirements. Contact us today to discuss your project needs and ensure a façade that stands the test of time.