“Often the last place considered to improve health, thermal efficiencies, home comforts, and more, is the slab your house is built on. Yet it might surprise you to learn that approximately 15% of a home’s heat is lost through the foundation.”
We agree completely with this media release by MaxRaft that New Zealand houses need fully insulated slabs, especially including the slab edge. There are many systems in NZ that do this and we’ve certified Passive Houses with MaxRaft insulated slabs, custom versions that look similar, Insulated Concrete Form (ICF) systems like Ecoblock and IZODOM—as well as timber floors on piles. MaxRaft is a good choice, especially for a design team’s first go at a Certified Passive House.