RS TENSILE PVT IN INDIA Tensile fabric structures have two main components: A metal framework (usually steel or aluminum), and a fabric envelope that stretches over that framework. Tensile structure is the term usually used to refer to the construction of roofs using a membrane held in place on steel cables. Their main characteristics are the way in which they work under stress tensile, their ease of pre-fabrication, their ability to cover large spans, and their malleability.