Double surface dressing

This is the application of two simple surface dressings, the second of these being made with a smaller sized aggregate than that used in the first. A simple surface dressing consisting in the application of a bituminous binder to a surface, followed by spreading and tamping the aggregate layer. The following operations should be carried out in this case: - Preparation of the existing surface. - Application of the bituminous binder. - Spreading and tamping the aggregate. It is called double surface dressing when two simple surface dressings are applied that are normally of different characteristics. The following should be carried out in this second case as well as the previously mentioned operations: - A second layer of bituminous binder will be applied. - A second spreading and tamping of aggregate will be made.