Sandwich panel installation for building extensions, interior and exterior building renovation. A sandwich panel (Sandwich Panel) is a type of panel used in construction, consisting of two outer layers with an insulating material between them. Here are some important specifications for sandwich panels: - *Outer layers*: Usually made of metal such as aluminum or steel, providing strong external protection. - *Insulating layer*: Made of materials such as polyurethane, rock wool, or polystyrene, offering excellent thermal and acoustic insulation. - **Panel thickness