Why use sheet metal to clad a building façade?

Sheet metal has a low weight compared to many solid façade materials. This facilitates transport and can be advantageous for refurbishment. However, the condition of the substrate and the method of anchoring the substructure still determine its use. A lightweight cladding also transfers wind forces to the building structure.

During renovation, it is necessary to assess what the brackets will be fixed to. Old plaster or an insulation layer are not automatically a suitable load-bearing substrate. The solution is selected according to the wall and the projected loads. The advantage of low weight is exploited when the entire fixing system is correct.

The colour and type of profiling can be combined with the roofing, flashings and joinery. It is not necessary to clad the entire house in sheet metal. Sometimes the gable, part of the garage or a utility area is sufficient. A large area in a calm colour can balance wood or plaster well.

The divisions of the sheets and their relationship to the openings are important. A window that accidentally cuts across the rhythm of the profile often looks worse than a carefully planned detail. Before ordering, it is worth producing an elevation drawing with the joints marked. This is a simple way to reduce narrow offcuts and asymmetrical ends.

A low profile gives a finer rhythm and may suit a smaller area. A taller trapezoidal profile draws the shadow more distinctly and may have advantageous properties with a specific support. However, one should not choose solely by height. The actual geometry and the parameters of the ordered sheet metal matter.

Check whether the product is intended for façades and which side has the decorative coating. The roof and wall variants may differ in the profile layout. When joining new sheets with old ones, the compatibility of the cross-section must be confirmed. A similar name is not enough.

Thin steel sheet on its own hardly performs a thermal insulation function. The thermal effect depends on the layers behind it. In a ventilated system, the cladding protects the insulation and works together with the air cavity. Its inlets, outlets and connections at openings must be resolved in the design.

A wall sandwich panel with an insulating core is sometimes an alternative. It combines several functions in one element but has its own rules for fixing and sealing. The choice between it and steel sheet alone should take into account the building’s requirements as well as the cost of all the layers needed to meet them.

The façade coating is subjected to sun, moisture and dirt. Near roads or industrial plants, the requirements may be greater. Soiling from ground level and contact with vegetation are also important. Constant dampness at the lower edge can shorten the durability of the detail.

The selection should take into account the possibility of cleaning and subsequent inspection. Parts sheltered from rain do not clean themselves as surfaces exposed to rainfall do. On the other hand, heavy rain can carry dirt from the roof. It is worth planning the flashings so that streaks do not run across a representative section of the wall.

Thin steel sheet can be locally dented, so areas exposed to impacts require attention. Near vehicle traffic, it is worth providing protection independent of the cladding. Large, flat sections can also reveal unevenness in the substructure. The care taken with the substructure has a direct influence on the appearance.

Metal reacts to temperature changes. Sheet lengths and details must take its movement into account. Connections must not be blocked in a way contrary to the instructions. If you want a very uniform effect, look at a sample or a completed project of similar dimensions rather than judging only a small swatch.

In addition to the steel sheet, allow for the substructure, brackets, fixings and flashings. Include corners, plinth, reveals and the termination under the roof. Determine how the longitudinal joints will look. Additional details affect the cost and should not be chosen at random only after the sheets have been laid.

Steel sheet on the façade can be a practical and aesthetic choice. It works best as part of a well-considered wall system. Durability is determined by a suitable coating, correct fixing and a path for water drainage. A modern appearance alone does not replace these fundamentals.