How heavy are the materials used for roof terraces?

How heavy are the materials used for roof terraces?

Lisa Andrews (Horticulturalist) gives expert video advice on: How heavy are the materials used for roof terraces?; Can I tile a roof terrace?; Can I lay a lawn on a roof terrace? and more...

Materials used in roof terraces can start at anything from a ton, and go up to three tons, depending on the weight of materials chosen and furniture chosen also.