A Framework for Cost-Optimal Zero-Energy Lightweight Construction

During the last decade, several roof extensions took place in the European cities with the purpose to increase the height of existing buildings using timber as a lightweight material. However, building regulations and green codes do not usually guarantee the achievement of multi-objective and highly performance roof extensions. Accordingly, this research aims to develop a state of the art framework to achieve cost-optimal zero-energy for timber construction, specifically when building on rooftops. Through a simulated and calibrated passive house model, the boundary conditions of the study have been identified and further parametric simulation and optimization have been carried out. This research aims at linking scientific research with practice. The framework provides a fast track measurement that provides a solutions space for building engineers who are in charge of decision making on the design and construction process. Best practices of roof construction could be achieved in terms of cost and energy, giving a vast
potential for a complete and deep renovation, and, therefore, reducing the overall ecological footprint on the city level.