During peak summer, bare concrete roofs absorb massive solar radiation. They act like giant heaters, radiating boiling heat straight down into your rooms all night.
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Dark concrete absorbs up to 90% of solar heat. High-quality white reflective paint does the exact opposite—it reflects up to 85% of sunlight straight back into space.
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Coating your roof with a solar-reflective layer can reduce your roof surface temperature by up to 10 to 15 Celsius, lowering indoor room heat dramatically.
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Paint won't stick to dust or moss. Use a stiff brush and water to wash your entire roof surface. Let it dry completely before moving to the next step.
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Before painting, check for any surface cracks. Fill them with an outdoor waterproof sealant. This prevents summer leaks and creates a perfectly smooth base.
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Put down a single layer of exterior wall primer. This locks the loose concrete particles together and ensures your expensive cooling paint bonds flawlessly.
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Use a long-handle roller to apply the specialized cool roof paint. Apply the first coat, let it dry for 4 hours, then apply a second coat crosswise for full coverage.
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Don't use standard cheap lime wash (Chuna)—it washes away in the first rain. Buy specialized elastomeric cool roof coatings with a high Solar Reflective Index (SRI).
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Because your roof stays naturally cool, your indoor home temperature drops. Your AC units and air coolers won't have to work nearly as hard, saving huge chunks of electricity.
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