Description

Revisions to the H1 Acceptable Solutions that came into force in 2022 and 2023 have changed the thermal performance requirements for buildings.

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, with a focus on housing.

Scope

This Bulletin includes:

1. Introduction
2. Building Code Clause H1 requirements
   • Schedule method
   • Calculation method
   • Modelling method
   • Heated floors
3. Determining construction R-values
4. Materials
5. Underslab insulation
   • Insulation under footings
   • Insulation under garage floors
   • Insulation and proprietary slab floor systems
6. Slab edge insulation
   • Proprietary slab edge insulation
   • Protection and maintenance of slab edge insulation
7. Floor topper insulation
8. Other design considerations
9. Further information