Facade Rain-Screen Ventilated Systems

What we deliver

Imported ventilated envelope systems — the sub-frame, insulation, breather membrane, cavity barriers and outer panel installed as one designed assembly.

The system works on a principle that surprises people the first time they hear it: the outer skin is not waterproof and is not meant to be. It is a screen. The drained, ventilated cavity behind it is what manages the water that gets past.

Delivered work

Project	Location	Scope	Quantity
DLF — WeWork	Cyber City, Gurgaon	Kingspan dry cladding ventilated system	3,325 sq. m.

The assembly, outside in

Layer	Function
Outer panel	Sheds rain, handles UV, sets appearance
Cavity, 25-50mm	Drains and ventilates; open at bottom and top
Cavity barrier	Stops fire and smoke at every compartment line
Insulation	Thermal performance; mineral wool preferred
Breather membrane	The actual weather line — continuous and lapped
Sub-frame	Carries panel load to structure; thermally broken
Substrate	RCC, blockwork or sheathing board

What drives the cost

Panel material — ACP, solid aluminium, HPL, terracotta, stone · cavity depth · extent of cavity barriers · insulation grade and thickness to meet ECBC · sub-frame complexity and bracket spacing · whether brackets are thermally broken · building height and access strategy.

Where projects go wrong

• Cavity barriers omitted or shortcut. The most serious failure mode available in this system.
• Membrane treated as secondary. A discontinuity at a corner, penetration or lap leaks regardless of panel quality.
• Ventilation path blocked. Insulation pushed into the cavity or sealed openings stop the airflow, and the cavity stops working.
• Thermal bridging ignored. Hundreds of brackets through the insulation can undo the assembly U-value the specification was written to achieve.
• Combustible insulation behind a combustible panel. Each may pass alone; together in a ventilated cavity they are a different proposition.

Why Hagerstone

One team detailing the whole assembly. Sub-frame, membrane, insulation, barriers and panel are designed together rather than split between a cladding supplier and a site contractor who meet only at the interface.

Imported systems within our in-house facade scope, alongside curtain wall, fenestration and cladding — so the junctions between systems are one party's responsibility.

79+ quality checkpoints, ISO 9001 / 14001 / 45001, 100% in-house execution.

Standards referenced

Fire and life safety, including cavity barrier requirements for external wall assemblies, under NBC 2016, Part 4. Opaque assembly U-value under ECBC 2017.