By definition, a waste is something that does not add value and takes up time, effort and unnecessary expenses within the work processes. Therefore, in any project it is of vital importance to identify what these wastes are in order to eliminate them.

Precisely, the LEAN methodology, which Roig already applies in all the works it initiates, is based on an extreme planning and control of production that, as a consequence, improves all these processes, eliminating activities that do not add value, allowing immediate results in productivity, competitiveness and profitability of the work. Continuous and sustainable elimination of waste is the main objective of LEAN. In order to make decisions that put an end to these non-value-adding activities, the LEAN system identifies '7 + 1 wastes': 1.- OVERPRODUCTION. That is, producing more than what the customer requires. This occurs when there is poor forecasting or planning of requirements. 2.- TRANSPORTATION. All material movements must be logistically efficient. 3.- WAITING TIME. They are nothing more than non-productive downtime such as a machine standing idle waiting for supplies, an operator with nothing to do, etc. 4.- OVERPROCESSING. Activities that are not necessary and could be dispensed with or simplified. 5.- EXCESS INVENTORY. Which can be generated by overproduction and causes time to be wasted in moving stock around. DEFECTS. Production of defective units that cannot be used. 7.- UNNECESSARY MOVEMENTS. Any movement that workers make without adding value to their work. HUMAN TALENT. It is the waste of employees' skills and capabilities by not placing them where they are most skilled. What is really important in any project must be added value The implementation of waste management is fundamental for any company that seeks to optimize its processes, through a more efficient use of resources and materials. Applied to the construction sector, it allows us not only to increase productivity and reduce costs and time, but also to offer a higher quality of the final project and contribute to a more sustainable construction. more sustainable construction.