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In the insulation world, spray foam is often promoted as the ultimate solution. It delivers high R-value per inch, excellent air sealing, and the ability to fill cavities and irregular surfaces.
Those are real advantages.
But when buildings, tanks, roofs, or containers are exposed to direct sunlight, a deeper question needs to be asked:
Are we controlling heat after it enters the structure, or before it enters at all?
That distinction separates traditional insulation systems like spray foam from surface heat-blocking technologies such as Super Therm®.
Understanding that difference changes how thermal performance should be evaluated.
When sunlight hits a surface, the energy arrives in three forms:
Most building materials absorb a significant portion of this energy. Steel roofs, metal containers, and industrial tanks can easily reach 70–80°C surface temperatures in full sun.
Once that happens, the structure itself becomes a heat source. The stored energy begins moving inward through:
Traditional insulation systems focus on slowing heat after the material has already absorbed it.
That approach works, but it means the building is constantly fighting the heat load.
Spray polyurethane foam is a powerful air-sealing insulation system.
When applied correctly it provides:
Closed-cell spray foam also adds structural stiffness and helps control condensation in some assemblies.
But spray foam works inside the building assembly.
The heat pathway typically looks like this:
In other words, the outer surface still absorbs the full solar load. Spray foam simply slows how fast that heat reaches the interior.
This is why R-value dominates insulation discussions.
R-value measures resistance to conductive heat flow through a material.
What it does not measure is how much heat the structure absorbed in the first place.
For sun-exposed buildings and industrial assets, the biggest heat driver is often solar radiation striking the surface.
If a roof or wall absorbs large amounts of solar energy, insulation inside the assembly must constantly fight that heat load.
Two systems with similar R-values can therefore perform very differently depending on how their surfaces behave under sunlight.
Surface behaviour matters.
Super Therm® approaches the problem from the opposite direction.
Instead of relying on thickness to resist heat flow, it manages solar heat behaviour at the surface.
The coating works through a combination of thermophysical properties including:
Together these properties create a surface that reflects and emits much of the incoming solar energy before it can be absorbed by the substrate.
This reduces the temperature rise of the underlying material.
The difference between the two approaches is straightforward.
Spray foam works by resisting heat flow through the wall.
Super Therm® works by reducing the heat load entering the wall in the first place.
Think of it this way:
Spray foam manages the symptom of heat entering a structure.
Super Therm® addresses the source of the heat load at the exterior surface.
Both rely on physics, but they operate at completely different stages of the heat pathway.
When a metal roof or container absorbs solar radiation, the surface temperature can climb dramatically.
That hot surface then radiates heat inward long after the sun has moved away.
Traditional insulation systems can slow this heat transfer, but they cannot change the fact that the outer surface absorbed the energy.
By contrast, a surface heat-blocking system reduces the amount of energy the surface absorbs in the first place.
Lower surface temperatures mean:
This is particularly important for sun-exposed assets such as:
Spray foam and Super Therm® are often grouped together under the broad category of “insulation”.
But they are fundamentally different technologies.
Spray foam is bulk insulation.
It relies on thickness and R-value.
Super Therm® is surface heat management.
It works by controlling radiation, emissivity and heat diffusion at the surface.
Because building science has historically focused heavily on R-values, surface thermal behaviour has often been overlooked.
Yet for sun-exposed structures, it can be one of the most important factors affecting performance.
Spray foam and Super Therm® are not simply competing insulation products.
They represent two different strategies for managing heat.
One slows heat once it has entered the structure.
The other reduces the heat load before it enters.
As climate conditions become hotter and buildings face increasing solar exposure, managing surface heat behaviour is becoming a critical part of modern thermal design.
Understanding where heat enters the system is the first step in controlling it.
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