Fabric strategy
The RIBA Passivhaus Overlay, published by the RIBA in 2022, states in relation to the Fabric Strategy This comprises form factor, glazing and shading and structural engineering strategies, and thermal performance requirements, as well as the Airtightness and Thermal Integrity Strategy, thermal bridge assessments and the Construction Programme. With a focus upon construction technology and buildability, develop an integrated approach which supports the airtightness strategy, thermal integrity strategy and thermal bridging mitigation strategy. Well implemented strategies avoid complexity, simplify construction, and reduce costs, avoid risks and the shorten the Construction Programme. To support this process, review plans, cross sections, longitudinal sections etc. and identify all junctions and interfaces. Consider how the building’s form and complexity impact upon the construction sequence and may compromise the airtightness testing regime, the standard of airtightness, the thermal integrity, and the extent of thermal bridging. At each stage and before work starts on site, to help ensure the right materials, plant and operatives are deployed in the right place at the right time, pay attention to the properties, characteristics and suitability of materials, products, components, and sub-assemblies, including their tolerances, impact upon interfaces, their fabrication and manufacturing techniques, their logistics (including the lifting, handling, transport and delivery methodology) and assembly. If possible, also seek to eliminate scaffolding and wet or hot works. Where appropriate, and liaising with the Passivhaus Designer/Consultant, agree which thermal bridges require calculation.”
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