Which frame material is best for a ventilated façade?

For multi-storey buildings with heavy panels, aluminium is the only option. For small ecological homes with lightweight cladding, wood is an excellent choice.

What are thermal breaks in an aluminium frame?

They are insulating pads at the base of each metal bracket. Without them, the metal fixing points create thermal bridges that transfer cold inwards.

Why is a wooden frame avoided for large buildings?

Wood can warp with moisture changes, cannot support very heavy panels at height, and risks rotting if not ventilated properly.

Ventilated Façade Support Systems: Aluminium vs Wood - A Complete Comparison

When we look at an impressive ventilated façade - whether it is clad with luxury ceramic tiles or aluminium composite panels (e.g. Alucobond) - we see only the "skin" of the building. What does all the hard work and keeps the system standing, however, is the hidden "skeleton" behind the panels, inside the air gap.

This skeleton (the support system) plays the most critical role in the safety and longevity of the construction. It must bear tonnes of weight and withstand extreme weather conditions. The two dominant materials for building it are aluminium and wood.

Let us look at the forces these frames battle against and which material wins the fight.

1. The 3 "Enemies" of the Frame

Before choosing a material, we need to understand exactly what the support system must face:

Three enemies of the façade frame - weight, wind pressure, thermal expansion

🪨 Dead Load (Weight)

The external panels (especially natural stone or thick ceramics) are extremely heavy. The frame must transfer this weight safely to the load-bearing structure (columns/concrete) of the building.

💨 Wind Pressure & Suction

In strong winds, air does not simply push the façade inwards. It creates negative pressure (suction) that pulls the panels outwards, trying to rip them off.

🌡️ Thermal Expansion

The outdoor environment has enormous temperature swings (from -5°C in winter to 65°C on the panel in summer). The frame continuously expands and contracts.

2. Aluminium Frame: The Undisputed King

In the vast majority of modern and large buildings, aluminium is the absolute necessity. The system consists of metal brackets (angles) screwed to the wall, onto which the vertical T-profiles "clip".

Aluminium frame - brackets and vertical T-profiles on a building

✅ Absolute Durability

Aluminium never rusts (unlike steel) and never rots. It is practically immortal, even in coastal areas.

✅ Enormous Structural Capacity

It can support the heaviest materials (e.g. granite or marble) on skyscrapers, withstanding extreme wind pressures.

✅ Precision Levelling

The metal brackets are adjustable. Even if the old wall is completely "crooked", the frame is adjusted millimetre by millimetre, delivering a perfectly flat façade.

❌ Thermal Bridges

Metal is an excellent heat conductor. Where the metal bracket pierces the insulation to grip the wall, it transfers cold inwards. This is why special insulating "pads" (thermal breaks) are required at the base of each bracket.

❌ High Cost & Energy

It is an expensive material with a high ecological footprint during production.

3. Wooden Frame: The Ecological Alternative

The wooden frame (usually treated pine or fir) is used mainly in lower buildings, single-family homes or when the external cladding is also timber.

Wooden frame - treated pine battens on a single-family home

✅ Natural Thermal Insulator

Wood does not transfer heat. It creates no thermal bridges at all, ensuring the full performance of the rock wool between the battens.

✅ Ecological & Affordable

It is a natural, renewable material (provided it comes from certified forests) and its purchase cost is noticeably lower than aluminium.

✅ Easy to Cut

Carpenters can work with it easily on site using simple tools.

❌ Moisture Risk

Although the gap is ventilated, a failure that leaves the timber permanently wet can lead to rot or mould. Top-quality treatment is essential.

❌ Warping & Limitations

Wood is a "living" material. With moisture changes it can warp (distort). It is not suitable for very heavy panels at height.

4. The 10x10 Model Experiment

Let us apply a ventilated façade to our digital two-storey house, located in an area with strong winds.

10x10 Model - wooden vs aluminium frame after 10 years

🪵 Wooden Frame

The insulation performs at 100% (no thermal bridges). After 10 years of extreme moisture and heat cycles, some wooden battens may "pull" slightly, causing the joints to be no longer perfectly symmetrical.

🏗️ Aluminium Frame (with thermal breaks)

The insulation performance drops by an almost imperceptible 2% due to the metal fixings. However, after 30 years and dozens of earthquakes or storms, the façade will be just as level and safe as day one.

💡 Verdict: For small, ecological homes with lightweight cladding, wood is an excellent, thermally "clean" choice. But for multi-storey buildings, commercial spaces, heavy panels and a lifetime guarantee against the elements, aluminium is the undisputed champion.

Ventilated Façade: What It Is & Why It Is the Top Solution for Commercial Buildings How the Air Gap in a Ventilated Façade Reduces Cooling Loads in Summer Thermal Bridges in Cavity Walls: Insulating Columns & Ring Beams How ETICS Protects the Concrete & the Building Structure

Insulation Systems: Complete Solutions for Every Building

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