Passivhaus Foundations and Floors

Passivhaus foundation and floor details, including a raft foundation wind-tightness detail, concrete floor slabs and build-ups, and wall-floor junctions for concrete, ICF, masonry cavity, masonry with Larsen trusses, timber frame with Larsen trusses, timber I-beam, SIP and twin stud timber frame walls, plus intermediate floors.

Why is the ground floor junction so important in Passivhaus? It’s often the hardest place to keep insulation continuous, because the wall sits on a structural foundation. Gaps here create thermal bridges.

Are these details Passivhaus certified? No. Certification depends on the whole building, its PHPP modelling and the products used.

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