BU685 Insulation of concrete slab-on-ground floors less than 300 M² (July 2023)

Revisions to the H1/AS1 that came into force in 2022 and 2023 have changed the thermal performance requirements for buildings and the minimum thermal performance required of slab-on-ground floors has increased. This bulletin outlines options and challenges with insulating concrete slab-on-ground floors for all housing, and buildings up to 300 m².