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Energy ratings were built for a different era. They measure compliance. They don’t measure real-time solar punishment on a surface at 2:30pm in January.
That gap matters.
Tools like Energy Star, NatHERS, and other compliance models focus heavily on insulation levels, HVAC efficiency, glazing values and annualised energy consumption. They work off assumptions, steady-state modelling and seasonal averages.
What they don’t properly capture is instantaneous solar radiation loading on exposed surfaces.
Solar energy is not a minor input. Around 44% sits in the visible spectrum, 53% in near-infrared, and 3% in UV. The majority of heating comes from infrared radiation. Once that energy is absorbed into a roof or wall, it becomes conductive heat. By the time the air conditioner starts, the envelope is already hot.
Most rating systems model what happens after heat is absorbed.
Very few focus on stopping the absorption in the first place.
ENERGY STAR, for example, promotes reflective roofing products based largely on solar reflectance and thermal emittance metrics rather than real-world diffusivity behaviour or dynamic surface stabilisation. Reference: www.energystar.gov/products/roof_products
NatHERS similarly models annual performance using software assumptions about materials, orientation and climate data rather than measuring active surface heat blocking. Reference: www.nathers.gov.au
These tools are useful for compliance. They are not designed to quantify heat neutralisation at the surface.
Solar Reflectance Index (SRI) is commonly used to describe how well a surface reflects sunlight and releases absorbed heat. It combines two measurements: solar reflectance (how much sunlight is reflected) and thermal emittance (how well the surface releases heat).
On paper, a high SRI surface should stay cooler than a low SRI surface when exposed to the sun. The limitation is that SRI is still a simplified metric. It focuses mainly on reflectance and emissivity under controlled conditions and does not fully account for how materials behave across the full solar spectrum, particularly the dominant near-infrared heat component, nor how heat moves through a surface over time.
As a result, SRI can indicate potential cooling performance but does not always predict real-world heat gain in roofs and walls where factors like thermal diffusivity, material density, and infrared blocking behaviour also determine whether heat actually enters the building.
Heat transfer through a building envelope begins with radiation. Not conduction. Not convection. Radiation.
When a dark or standard coated roof absorbs infrared energy, its surface temperature can exceed ambient by 30 to 40°C. That energy is then driven inward.
Most conventional insulation systems rely on bulk R-values. R-values measure resistance to conductive heat flow under controlled laboratory conditions. They do not measure:
This is why buildings can meet rating compliance and still overheat.
Urban heat island research consistently shows that absorbed solar radiation in hard surfaces is a major contributor to elevated ambient conditions. Reference: www.epa.gov/heatislands
If the surface absorbs heat, the building stores heat. If the building stores heat, internal temperature rises. Ratings don’t eliminate that chain. They calculate around it.
Rating tools tend to assume:
But real performance depends on surface behaviour in peak conditions.
A material with low thermal diffusivity changes temperature more slowly. If it also reflects and blocks infrared radiation effectively, the surface stays closer to ambient. That reduces inward heat drive before mechanical systems are required.
This is the missing layer in most energy modelling frameworks.
The focus has historically been on improving air conditioners, improving glazing, increasing insulation thickness. Very little attention has been placed on stopping broadband infrared radiation at the external surface.
That’s a surface science issue, not a mechanical efficiency issue.
The shift needs to move from energy consumption modelling to heat load prevention.
Super Therm® was developed through ceramic compound research to address exactly this issue: blocking solar radiation at the surface level rather than absorbing and managing it later.
It reflects 97% of UV radiation and blocks 99% of infrared heat as tested under ASTM E1269 and ASTM E1461 standards. It operates at a 0.25 mm dry film thickness, stabilising the building envelope rather than adding bulk mass.
More detail on testing and field results: neotechcoatings.com/super-therm-testing-and-results/
In the City of Adelaide Cool Roof Trial, internal temperatures were recorded up to 6°C below ambient. That result is surface control, not just insulation compliance.
Traditional systems measure resistance after heat is inside.
Heat blocking coatings focus on stopping it at the boundary.
That difference is fundamental.
Energy Star and rating tools are not wrong. They are incomplete.
They measure efficiency of systems.
They do not fully measure surface heat absorption under peak solar load.
In hotter climates, with increasing extreme weather, surface thermal behaviour becomes more important than ever.
If we want cooler buildings and reduced urban heat, the strategy has to start with one simple question:
Are we blocking heat…or just managing it after it gets in?
ENERGY STAR Roof Products:
www.energystar.gov/products/roof_products
NatHERS – Nationwide House Energy Rating Scheme:
www.nathers.gov.au
US EPA Urban Heat Island Overview:
www.epa.gov/heatislands
Super Therm® Testing and Results:
neotechcoatings.com/super-therm-testing-and-results/
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