The whole-building system approach
Overall, a whole-building system approach can assist with meeting Passivhaus requirements, particularly as the pre-fabricated components should have good performance characteristics and their use can reduce construction time, resulting in lower labour costs, and minimise on-site delays due to adverse weather conditions.
However, whole-building systems do not remove the need for effective design input, as outlined above. Orientation, services, design and other factors will all have a significant effect on the cost, efficiency and successful delivery of a project using a whole-building system.
• A whole-building system can remove some of the complexities of ensuring that different materials and components can be combined to achieve Passivhaus requirements
• Prefabricated components can speed up construction time, resulting in lower labour costs.
• Construction programme is less affected by bad weather.
• The mechanisation used in construction increases conformity to the Passivhaus standard.
• Materials are protected from exposure to the elements during construction
• Quality control and factory airtight sealing ensures better quality control.
• The system(s) may not work for all projects and design choices.
• Effective design decisions are still required.
• Space is required to transport manufactured modules or components to their site.
• Affordability may be an issue, particularly for smaller projects; increased production volumes on larger projects should offer greater affordability