Why do I need Slab Edge Insulation?
Insulating the edge of your concrete slab is important because that’s where most of the heat (up to 80% according to BRANZ), escapes. We recommend insulating the edge of your slab in all cases, however where you definitely need edge insulation;
Updated H1 requirements
If you want to achieve a higher Homestar rating.
If you’re planning on using in-slab heating.
The New Zealand Building Code clause H1 (Energy Efficiency) has been updated. In accordance with H1/AS1 and H1/VM1 there are new minimum R-values for slab-on-ground floors. The appendix of each provides the R-Value of common concrete slab floors and replaces the previous minimum of R1.3.
Of course we recommend all concrete floor slabs, and all aspects of a building, should ideally be constructed to be more energy efficient. This is even more important when heating slabs as well.
We offer a range of proven systems with various top details to suit your build design.
Heat loss through a slab to the outside (source: Design Navigator)
Thermal model showing heat loss through traditional concrete slab (source: BRANZ)
Thermal model showing heat loss through traditional concrete slab with slab edge insulation (source: BRANZ)