ThermaCast™ Performance
Energy Efficient Homes NZ
ThermaCast homes are engineered for energy performance. Integrated insulation, airtight concrete construction, and passive thermal mass work together to reduce heating costs and keep your home comfortable year-round.
Why Thermal Performance Matters
New Zealand homes have historically underperformed on energy efficiency. Even with recent updates to the Building Code (H1 2023), many new builds still rely on minimum-spec insulation in timber frames that are interrupted by studs, noggings, and service penetrations — all of which create thermal bridges.
ThermaCast takes a fundamentally different approach. By integrating the insulation into the wall structure and eliminating timber framing entirely, we deliver a continuous thermal envelope with no weak points. The result is a home that stays warm in winter and cool in summer with significantly less energy input.
Performance Comparison
How ThermaCast measures against NZ Building Code minimums.
| Metric | ThermaCast | Code Minimum |
|---|---|---|
| Wall R-Value | R 2.8 – R 3.6 | R 2.0 |
| Airtightness | < 3 ACH@50Pa | No requirement |
| Thermal Bridging | Minimal | Not assessed |
| Thermal Mass | High (200mm concrete) | Not assessed |
Real-World Benefits
Up to 50% Less Heating Energy
The combination of continuous insulation, airtight concrete construction, and internal thermal mass can reduce annual heating energy by up to 50% compared to a code-minimum timber-framed home.
Stable Indoor Temperatures
Thermal mass in ThermaCast walls absorbs excess heat during the day and releases it at night, maintaining indoor temperatures within a narrow comfort band without mechanical intervention.
Reduced Moisture Risk
Concrete walls do not absorb moisture the way timber framing can. Combined with exterior insulation that keeps the concrete warm, the risk of interstitial condensation is virtually eliminated.
Lower Lifetime Operating Costs
While upfront build costs are higher than standard timber construction, the ongoing energy savings, reduced maintenance, and extended lifespan deliver a lower total cost of ownership over the life of the home.
The Role of Thermal Mass
Thermal mass is the ability of a material to absorb, store, and release heat. In a ThermaCast home, the 200mm concrete wall acts as a heat battery. During the day, sunlight and internal gains warm the concrete. At night, as air temperatures drop, the concrete slowly releases that stored energy back into the living space.
This effect smooths out temperature swings that are common in lightweight timber-framed homes, reducing the need for supplementary heating in the evening and maintaining a more even indoor climate throughout the day.
For this to work effectively, the insulation must be on the outside of the concrete — which is exactly how ThermaCast is designed. Insulation on the inside (as in standard builds) prevents the thermal mass from interacting with the indoor environment.
Build an Energy-Efficient Concrete Home
Talk to our team about ThermaCast performance specifications and how they apply to your build.
Request Performance Data