The basic idea
Instead of attaching Alucobond panels directly to the wall, a rear ventilated facade creates a continuous air gap between the panels and the structural wall behind them. Aluminum brackets and rails hold the panels at a fixed distance, typically 40 to 80 mm off the wall, with insulation usually filling part of that gap.
It looks like a small detail. It is actually a complete reengineering of how the facade behaves under heat, moisture and time.
Thermal performance
The air gap behind the panels is constantly moving. Hot air rises out the top of the cavity, cool air enters from the bottom. This natural convection actively removes heat from the wall surface, especially on the sun-facing elevations.
Add to that a layer of mineral wool or rigid insulation within the gap, and the wall assembly performs dramatically better than a sealed cladding system or traditional plaster. Cooling loads typically drop by 20 to 35 percent on west and south elevations after a proper rear ventilated facade is installed.
Moisture control
Conventional cladding traps moisture. If any water penetrates the panel joints (and it always does, eventually), it has nowhere to go. Over years, moisture builds up behind the cladding, mold develops, and the wall structure degrades.
A rear ventilated facade assumes that water will get behind the panels. The air gap drains and dries any moisture that enters. The wall behind stays dry. The cladding lasts a generation instead of a decade.
Fire safety implications
The air gap is also a fire-safety consideration. Properly designed ventilated facades use horizontal fire stops at floor levels to prevent fire spread within the cavity. This is essential, and it is one of the reasons FR or A2 panels are required by code, even within a properly engineered system.
A rear ventilated facade with the right panel grade and engineered fire stops is the only configuration we install. Anything less compromises the system.
What a proper system includes
Specifying a rear ventilated facade means specifying a complete system, not just panels. The components matter:
- Aluminum mounting brackets engineered for the wall type
- Continuous vertical and horizontal rails sized for wind load
- Mineral wool or rigid insulation, code-compliant for the building type
- Vapor membrane on the wall side of the insulation
- Engineered fire stops at floor levels and around openings
- Stainless steel fasteners rated for the local climate
- Code-compliant flashings at openings, parapets and base details
Frequently asked questions
Can a rear ventilated facade be installed over an existing wall?
Yes. This is one of the major advantages for renovation projects. The mounting brackets attach to the existing structure with engineered fasteners. There is no need to demolish the existing wall, which is why facade renovations can be completed without displacing residents.
How much does the system add to the cost compared to direct-fix cladding?
A proper ventilated facade typically costs 15 to 25 percent more than basic direct-fix installation. The cost difference pays back through lower energy bills, longer service life and avoided moisture damage within roughly 8 to 12 years.
Does the system change the look of the facade?
Not visibly. The cavity is hidden behind the panels. From the street the facade looks like any high-quality cladding installation. The performance differences are entirely behind the scenes.
How thick does the air gap need to be?
Forty millimeters is the practical minimum for effective ventilation. Most projects use 60 to 80 mm to accommodate insulation while maintaining proper airflow. Calculated thicknesses depend on cavity height, building exposure and wind load.
