Thermal roof paint: Does it really lower the heat?

Metal sheet and fiber cement roofs absorb large amounts of solar radiation. On sunny days in Medellin, the interior of warehouses or top floors can become an oven. This is where thermal paint or waterproofing comes in.

How does it work? The Albedo effect

Thermal paint, usually white or in very light tones, is formulated with ceramic microspheres or acrylic polymers that give it a high solar reflectance index (Albedo). Instead of absorbing the sun's energy, these surfaces act like a mirror, bouncing up to 85% of UV rays and infrared radiation back into the environment.

Proven benefits

• Indoor temperature reduction: Depending on the roof type and cross ventilation, the indoor environment can cool between 3°C and 5°C.
• Dual function: Most of these paints are elastomeric, meaning they not only cool but also waterproof by sealing micro-cracks.
• Energy savings: By having a cooler interior, the use of fans and air conditioning systems is drastically reduced.

Can it be applied to any roof?

It is ideal for flat concrete slabs, galvanized metal roofs, and fiber cement covers. It is not recommended for clay tiles or high-traffic walkable surfaces, as dirt will quickly diminish its reflective capacity.