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White roofs are everywhere.
High solar reflectance. Lower surface temperatures. Ticked compliance boxes.
On paper, that looks like progress.
In reality, reflectance is only one part of heat transfer. If you stop there, you miss how heat actually moves through a building envelope and why many “cool” surfaces still allow significant internal heat gain.
If we are serious about reducing HVAC load, protecting assets and designing for a 2050 climate, we need to talk about the full science.
Heat moves in three ways:
Most cool roof discussions focus almost entirely on solar reflectance. That addresses part of radiation.
It does not address what happens after absorption.
Solar energy is not just “light”.
Approximately:
The majority of solar heat load sits in the infrared spectrum. If a surface does not effectively deal with infrared, it still absorbs significant energy even if it appears bright white.
Reflectance matters. But what happens to the energy that is not reflected matters more.
Reflectance is the percentage of radiation bounced away.
Absorptivity is what remains and is taken into the material.
Even high-reflectance coatings still absorb some energy. Once absorbed, that energy must go somewhere.
This is where most marketing stops.
Once radiation becomes heat within a surface, material properties take over.
Three properties now determine performance:
Conductivity measures how quickly heat moves through a material.
Lower conductivity slows heat flow. This is what traditional insulation focuses on.
But conductivity alone does not tell the full story, especially for thin films or surfaces directly exposed to high radiation loads.
Diffusivity measures how quickly a material responds to temperature change. It combines conductivity, density and specific heat.
A material can have moderate conductivity but still perform well if its diffusivity is low. That means heat spreads slowly through it.
Diffusivity explains why some thin coatings can meaningfully reduce heat transfer despite being only 0.25 mm dry film thickness.
This is the property almost never discussed in cool roof conversations.
Specific heat defines how much energy a material can absorb before its temperature rises.
Higher specific heat increases thermal lag. It slows peak heat transmission into the building.
If you ignore specific heat and diffusivity, you are analysing only part of the system.
High emissivity allows a surface to re-emit absorbed heat back to the atmosphere.
This is critical.
A surface that reflects well but cannot re-emit efficiently will still retain energy.
The interaction between reflectance, absorptivity and emissivity defines real-world performance, not reflectance alone.
For technical background, the US Department of Energy explains how solar reflectance and thermal emittance work together in cool roof systems:
https://www.energy.gov/energysaver/cool-roofs
There is a difference between:
A surface can be cool to touch and still allow significant heat load into the building envelope over time.
This is why field trials matter more than laboratory-only reflectance data.
Government trials in Australia have demonstrated measurable internal temperature reductions when surface heat is properly controlled, not just reflected:
https://neotechcoatings.com/super-therm-testing-and-results/
That is load behaviour, not marketing.
R-values measure resistance to conductive heat flow under steady-state conditions.
Solar radiation is dynamic, high-intensity and spectrum-driven.
R-values do not measure:
ASTM and ISO standards address individual properties such as conductivity and thermal diffusivity, but building codes often simplify everything into R-values.
This is a modelling convenience, not a full thermal analysis.
For deeper understanding of how heat transfer is defined in standards, refer to ASTM E1461 for thermal diffusivity and ASTM C177 for conductivity testing via ASTM International:
https://www.astm.org/
If you only measure reflectance, you only understand what happens at the first moment of solar contact.
You do not understand:
In high solar climates like Australia, surface control is not cosmetic. It is structural.
Reflectance reduces incoming radiation.
Diffusivity controls internal heat movement.
Emissivity releases stored energy.
Specific heat delays peak load.
Long-term durability determines whether those properties hold after five, ten or twenty years of UV exposure.
Remove one of those variables and performance drops.
White paint is not the same as thermal control.
High reflectance is not the same as heat blocking.
If we want genuine energy reduction, asset protection and lower HVAC demand, we must analyse complete heat transfer behaviour, not one isolated metric.
Reflectance gets the headlines.
Thermal science determines the outcome.
US Department of Energy – Cool Roofs
https://www.energy.gov/energysaver/cool-roofs
ASTM International – Heat Transfer Testing Standards
https://www.astm.org/
NEOtech Coatings – Super Therm Testing and Results
https://neotechcoatings.com/super-therm-testing-and-results/
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