We have done a lot of research and experimentation with our structural materials, from SG8 timber in our first Rimu , LVL precut & nail framing in our Pōhutukawa, and our Rata's have been constructed from two brands of SIPS (Structurally Insulated Panels), but we have set our path forward with NZSIP for our Rata, Totara, and soon to be released Manuka models.

You may question why we use a petroleum based product in an eco home, that's because its a weighted decision made on data as we strive to be as environmentally responsible as possible by looking at the total energy costs for the life cycle of the build.

SIPS, combined with our continuous ventilation and heat recovery system, uPVC Lightbridge window suite, vented roof and cladding offer drastically lower heating and cooling the home, reduced maintenance schedule, and increased longevity.

Why NZSIP and not one of the other manufactures? From the outside they look the same, but there's a few key factors that changed our mind.

1. Polyurethane (PUR) is the highest rated insulation in the world. You will find it in almost all of your refrigerators, freezers, and even in your personal carry about coolers. Per inch of insulation, it has no equal! 


The biggest difference between polyurethane (PUR) and polystyrene (PIR) is in the manufacturing of the panels. Both products use particle board for covering both sides of their foam, but here is where the similarity ends. In the bonding of the foam the actual polyurethane is used as bonding agent to the board itself. While polystyrene panels use glue spread on both sides of the board and are mechanically held in place and under pressure until the glue is dried. 

When it comes to adhering, the use of polyurethane gives us both an excellent R- value and the strongest bond in the industry.  

The Rata is an incredible - R7 ceiling and floors, R4.5 in the walls.
Our Manuka has R7 floors, walls & ceiling.

2. Polyurethane-filled (PUR) panels offer superior fire ratings, thereby enhancing the safety of your home.

3. Local supply, NZSIP are a stones throw from our Cromwell facility, this has resulted in reduced transport cost & carbon impact, offered greater flexibility with design changes that have helped both businesses build better products &  processes.

4. Cost effective for the performance and speed of construction.

5. BRANZ Appraised: 

A BRANZ Appraisal gives confidence about the building product or system to building specifiers, regulatory bodies, building officials and building consent authorities. They can be confident that the product has been subjected to in-depth and rigorous examination by an independent, trusted organisation.

BRANZ Appraisals are commonly accepted by approving authorities in New Zealand and Australia as evidence for Building Code performance requirements.