Aluminium Composite Panels in Mumbai

Composite Panel

Composite panels are what a façade uses for everything that is not glass: spandrels, plant screening, soffits and solid elevations. They are light, they hold a flat finish over large areas, and the two things that decide whether they are a good idea are the core grade and how the joints drain.

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Why composite panel

Fire-classified cores

Mineral-filled A2 and FR cores specified to the building's requirement, not the cheapest sheet available.

Flat over large areas

A composite sheet holds flatness far better than folded solid aluminium, so reflections do not oil-can.

Drained, open joints

Panel joints designed as drained rain-screen joints rather than sealed lines that eventually fail.

Coastal-grade fixing

Sub-frame and fasteners specified for salt air, because that is what corrodes first on a Mumbai elevation.

What a composite panel is

Two thin aluminium skins bonded either side of a core. The sandwich behaves like a much thicker sheet — it stays flat, resists denting and can be folded into cassettes — while weighing a fraction as much.

That flatness is the reason it is used. Folded solid aluminium over a large area tends to oil-can: visible waviness in reflections that no amount of good detailing hides. A composite sheet stays flat.

The core is the decision

This is the part that matters more than anything else on the specification.

Polyethylene (PE) core. Cheapest, and combustible. It is the material implicated in well-known façade fires internationally, and it has no place on a building of any height or occupancy.

Fire-retardant (FR) core. Mineral-filled, with substantially better fire performance.

A2 core. Predominantly mineral, classified as limited combustibility. The specification for high-rise, public and institutional buildings.

We specify to the building’s requirement rather than to the cheapest sheet that will pass a procurement check. On anything covered by high-rise or public-building requirements, this is not a place to value-engineer.

Joints that drain

A composite panel façade is a rain screen. It is not meant to be a sealed skin.

The panel joints shed most water. Anything that gets behind enters a drained and vented cavity, runs down, and exits at designed points. Gaskets and baffles control airflow through the joint rather than sealing it shut.

The failure mode to avoid is a façade sealed with a continuous silicone line along every joint. That works until part of the line fails, which it will, and then water enters a cavity with no drainage designed into it.

Fixing, in coastal air

The panels outlast their fixings in Mumbai. Salt-laden air attacks the sub-frame, brackets and fasteners long before it affects the aluminium skin or the coating.

So the specification covers the whole assembly: a sub-frame in a suitable alloy or treated steel, stainless fasteners of an appropriate grade, and isolation between dissimilar metals to prevent galvanic corrosion. That last point is routinely missed and shows up as staining below fixings after a couple of monsoons.

Finish

PVDF coatings are significantly more UV-stable than polyester and are the sensible choice on any high-exposure elevation.

With metallic and mica finishes, panel orientation matters — the flake alignment means a panel rotated 180° can read as a different shade. Panels are marked and installed to a consistent orientation for this reason.

Where they go on a building

Spandrel zones between floors, plant screening at roof level, soffits and undercrofts, solid infill between glazed bays, and full solid elevations where glazing would be a liability.

Combined with standard or structural glazing, composite panels let the glazed proportion of an elevation be a design decision rather than a structural constraint.

Common questions

What is an aluminium composite panel?

Two thin aluminium skins bonded either side of a core, supplied as a flat sheet and folded into cassettes on site or in the factory. The sandwich construction gives the flatness and stiffness of a much thicker aluminium sheet at a fraction of the weight.

Are composite panels a fire risk?

It depends entirely on the core. Polyethylene-cored panels are combustible and are the material behind well-known façade fires. Mineral-filled FR and A2 cores are classified for fire performance and are what should be specified on any building of consequence. The core grade is the single most important decision here.

How are composite panel joints kept watertight?

By treating them as drained rain-screen joints rather than sealed ones. The open joint sheds most water, and anything getting behind runs down a drained cavity and out. Relying on a continuous line of sealant means relying on something that will eventually fail somewhere.

Do composite panels fade in Mumbai sun?

Good ones hold colour well. The finish is what matters — PVDF coatings are considerably more UV-stable than polyester, and on a high-exposure elevation that difference shows within a few years. Metallic and mica finishes also need care over panel orientation, so shading does not vary between panels.

How long do composite panel façades last?

The panels themselves last a long time. The limiting factors in coastal Mumbai are the sub-frame and fixings, which corrode before the panel does, and the joint gaskets. Specifying both for salt air is what determines the façade's real service life.