Aluminium, Steel or Zinc? The Importance of Choosing the Right Metal Shroud for Your Building Façade

Go for a drive through some newer suburbs in Melbourne, and you’ll soon see what I mean by metal shrouds – clean metal surrounds around window panes. They are able to transform boring wall surfaces into something special. However, choose the wrong metal or coating, and that crisp look will quickly become unappealing streaks.

Why Window Shrouds Became So Popular?

The addition of metal shrouds gives buildings with brick or render facades a more dynamic look because of the shadow line created by the protrusion from the wall surface. Designers also appreciate the contrast of a dark metal surround with light-colored brickwork.

Even renovations have become familiar with metal shrouds. Adding them to an older building will enhance its appearance without changing the actual windows.

Honest Metal Comparisons

Every metal has its own unique characteristics and limitations:

• Aluminium: Lightweight, corrosion-resistant, easily folded and coated with a powder coating.
• Coated Steel: Durable and economical but cut edges have to be treated for rust protection.
• Zinc: It has a natural soft patina which determines its lifetime depending on its quality, design and exposure to weathering.
• Copper: Eye-catching and durable but very costly and its colour fades over time.

Aluminium is the most popular metal for domestic use due to its ability to form complex folds and is rust-resistant. The weight of steel requires a stronger fixing method especially when used for old brick veneers and lightweight walls. Fixing has to match the wall and the load.

The Shroud to Suit the House

A shroud should match the house, not be an add-on. Thin, flush frames go better with modern townhouses, whilst larger feature windows benefit from deeper frames which become part of the focal point.

Older houses demand a gentler approach. A black frame that looks too heavy for a weatherboard house is one example, and homes within heritage districts must take council material and colour restrictions into consideration.

Finishes Determine the Lifespan

Powder coating involves a layer of colour being bonded to the metal. Instead of powder coating, anodising is a process of thickening the natural protective layer of aluminium. Both do very well when the finish suits the environment.

Colour affects performance as well as aesthetics. Black shrouds will be hotter than light colored ones and will be hot in the western sun. Coastal houses may require shrouds that are salt-air resistant as per the manufacturer’s recommendation.

What Drives the Price?

Prices for shroud quotations vary greatly, and this is mostly due to practical considerations. Fabrication time will depend on size, metal thickness, and the number of folds involved. Custom colours, unique coatings, and intricate corner shapes also contribute to the price.

Access is equally important. Ground floor windows are easy, but higher floors might require scaffolding or lifting gear. Comparing quotations will be much simpler if each quotation itemises the metal type, thickness, finishing, and installation technique.

Fit Is Everything to the Window

There is not one perfect square window opening in an old home anywhere. Homes tend to settle over time, and windows shift in their frames. Measurement during installation will help prevent misshapen openings, odd joins, and cracks in the shroud.

The shrouds are either prefabricated in a workshop, or installed on-site in pieces. Both approaches have advantages, and which is better varies according to a number of factors.

A shroud needs to be able to repel water. Water must be pushed off the shroud and kept from getting into contact with the frame of the window.

Living With Metal Over Time

The lifetime of coatings is maximised through cleaning them as per the manufacturer’s directions. Cleaning removes salts, dust, and bird excreta before they start eating away at the surface. Look out for chalking, scratches, and signs of corrosion near the fasteners.

When shrouds have been damaged, replacement may not be necessary in all cases. In some cases, a repair or recoating can return both the colour and the protection at a lower cost.

The true test of any metal shroud will come years later once the scaffolding has been removed. The first question to ask yourself is how the coating will look after ten Melbourne summers.