Choosing the Right Sandwich Panel - Buying Guides ArchiExpo

Many sandwich panels are optimized for a specific application, such as roofing or cladding. However, you must ensure they meet local regulations and are suitable for your building. Here are the two most common applications and key considerations:

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Facade sandwich panels provide thermal insulation for the building&#;s exterior while shielding it from various weather conditions. Keep in mind that fire safety requirements are often stricter for taller buildings.

Roof sandwich panels must adhere to the aforementioned criteria while also taking into account variables such as roof pitch and roof loads which may include snow accumulation, maintenance equipment, and personnel. Some roof sandwich panels feature profiles that mimic traditional roofs, with tile patterns, a standing seam, or a corrugated design.

Sandwich panels can also be used for walls, partition walls, soffits, and doors. Your specific needs may influence the material and finish you choose.

Guidelines to avoid corrosion problems

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A serious cause of deterioration of sandwich panels is galvanic or electrochemical corrosion. This occurs when the more noble of the two metals, in contact with an electrolyte (usually water), performs an electrochemical aggression on the less noble metal.

In fact, all metals have a characteristic electric potential. When metals of different potentials are in contact in the presence of an electrolyte (moisture, acid, etc.), a weak current of energy flows between them, causing corrosion of the metal with the higher potential (the less noble metal).

In the end, the less noble material will be so corroded that it will have to be replaced. In any case, with a careful choice of materials and protective coatings, galvanic action can be eliminated or greatly reduced.

The wider the gap between the metals in the frame, the more likely it is that corrosion will occur. For example, aluminum will corrode in the presence of 410 (active) stainless steel, but this corrosion will be even more severe in the presence of nickel. Metals of the same group do not normally give rise to galvanic corrosion as, for example, titanium and 304 stainless steel (passive). If the cathode metal (more noble) is larger than the anode metal (less noble), the corrosion will be much more severe, which would not be the case if the size were the opposite. For example, it is usually possible to use bronze seals in steel hydraulic pipes, which only causes slight corrosion of the steel. On the contrary, if steel gaskets were used in brass hydraulic pipes, these gaskets would corrode quickly.

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