The ISOBIO project has successfully developed a composite bio-based wall system that has shown exceptional hygrothermal performance and reliability, providing a new-build wall panel that can be industrialised and manufactured at scale, ready for integration into a complete pre-fabricated construction system for nearly-zero energy buildings.
To this end, ISOBIO partner Progetic has produced two guides that include seven opaque construction details for two different climates: cool-temperate (Lyneham, UK) and warm-temperate (Seville, Spain). The details show typical connections for ground floor>wall junctions, intermediate floor>wall, roof>wall and panel>panel junctions. Information relating to water-proofing, airtightness and vapour control is included.
All details have been modelled with 2-dimensional thermal bridge software, and designed to minimise heat loss and ensure minimum internal surface temperatures to avoid surface mould growth and condensation. Fabric U-values have been sized to meet the limiting heating and cooling demands required by the Passivhaus standard, using the PHPP (Passive House Planning Package) modelling tool for each climate (15 kWh/m2·a for space heating and 16 kWh/m2·a for space cooling in the warm-temperature climate).
The result is a set of construction details that comply with the Passivhaus standard, offering practical information to architects, contractors, developers and engineers who are looking to use the ISOBIO system in a low-embodied energy, nearly-zero energy construction.