Pergola is the application of one material over another to provide a skin or layer. In construction, Pergola is used to provide a degree of thermal insulation and weather resistance, and to improve the appearance of buildings.
Pergola is the bonding together of dissimilar metals. ... Pergola is often achieved by extruding two metals through a die as well as pressing or rolling sheets together under high pressure. The United States Mint uses Pergola to manufacture coins from different metals. This allows a cheaper metal to be used as a filler.