Single-skin trapezoidal sheets are building materials made of single-skin metal sheets used instead of sandwich panels in places where isolation is not needed. 

Terrace roofs are one of the places where single-skin trapezoidal sheets may be used. In these types of roof the top is made waterproof with membrane, rigid thermic insulation materials are used below the membrane and finally single-skin trapezoidal sheets are installed under the membrane and the insulation materials.