A sandwich panel combines metal facings with a core, but its suitability is determined by the whole product and how it is used. For a new building, selection should start from the function of the rooms, through the requirements of the building elements, to dimensions and cost. This approach allows real solutions to be compared rather than choosing solely by the name of the core. A dry warehouse, workshop, office back-up area and cold store may sit under one roof but place different demands. Note the temperature, humidity, cleaning method and planned equipment. Also identify areas requiring protection against impacts or frequent traffic. This is the starting point for selecting walls and roof.

The choice between first grade and outlet depends on the function of the partition, the type of deviations and batch matching. A low price does not clarify whether the defect is aesthetic or affects the joint and the panel's performance. First define the project requirements, then calculate the saving taking into account the cutting layout, accessories and the number of usable pieces. A partition separating zones with a required fire resistance has different criteria from the cladding of a small unheated warehouse. Likewise, a frontage at the entrance requires a different assessment of appearance from a surface not visible from outside. List the technical and aesthetic requirements separately. Do not weaken the former in order to match the project to a cheaper batch.

A sandwich panel garage should be designed around how it will be used, not around the thickness of the first panel you find. The interior temperature, the width of the gate and the path of water all affect the walls, roof, floor and structure. The budget should cover all of these elements, because the panels alone are only part of a finished building. Storing a car and doing daily work at a workbench mean different conditions. In the first case, protection from precipitation, ventilation and drainage of water brought in on the wheels are key. In the second, continuous insulation, airtightness and limiting losses through the gate are added. Determine the working temperature before selecting panels.