Insulated slab

An insulated slab ground floor system satisfies all the Passivhaus principles of design, including: continuity of insulation, no thermal bridging, airtightness of the concrete slab, and no issues with thermal bypass. In principle, achieving a ‘thermal bridge free’ junction with the walls is ideal, although the design depends on the walling system that is being used:

• A lightweight construction, such as timber frame, lends itself to being built directly off the slab.

• Heavyweight construction commonly needs direct support from the foundation; cost-effective minimisation of this thermal bridge requires the project’s structural engineer to understand the fundamentals of ‘thermal bridge free’ construction.

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