The most favourable panel offer does not always have the lowest price per square metre. When comparing suppliers from different parts of Poland, lengths, cutting patterns, accessories and transport conditions matter. It is worth calculating the cost of the material that will actually go into the building envelope and separating it from the value of the purchased pack alone. One offer may quote a price per square metre of covering, another per piece, and a third per whole pack. Bring them all down to the number of panels with known dimensions and usable area. Do not automatically compare a roof panel with a flat wall panel of the same thickness. Their geometry and role in the building are different.

A sandwich panel is the colloquial name for a composite panel used as building cladding. In a typical metal panel, an insulating core bonds two thin facings. The element can perform several functions at once, but it needs suitable supports and details. Understanding this construction helps distinguish the panel from the insulation alone and from the main structure. The facings and core form a composite element. Its behaviour depends on their interaction, so damage to the bond between them has a different significance from a small surface scratch. Parameters must be assessed for the whole product, not by adding up the properties of the separate materials.

The thickness of a sandwich panel results from several checks. Thermal insulation is one of them, alongside load-bearing capacity, fire, moisture and the conditions for making connections. In a new building, the selection should be carried out together with the arrangement of supports and openings. A panel with good U-value will not on its own solve a poorly planned roof-to-wall junction. Record the function of the rooms and the temperatures on both sides of the partition. The wall of a heated workshop, the roof of a warehouse and a cold-storage partition work under different conditions. Add to this humidity, the method of ventilation and fire requirements. Only on this basis are the parameters that the enclosure must meet determined.

A livestock building requires an enclosure matched to temperature, moisture and the way the animals are kept. The same panel does not have to perform in every room of the farm. In a new cattle shed, pig house or poultry house, the choice of walls and roof should be made together with the ventilation design, washing zones and the layout of equipment. The designer needs information on the purpose of individual rooms, the expected temperature and the amount of moisture. Part of the building may operate with different heating or a different airflow than the adjacent zone. One insulation variant should not be adopted solely on the basis of the name of the entire facility.