Environment
Cool Roofs: How a White Coat Can Drop Your Indoor Heat by 4°C
A reflective roof coating can lower indoor temperatures by roughly 2-4°C during peak summer.
Look for solar reflectance above 0.70 and emittance above 0.75, not just 'white paint'.
Telangana made cool roofs mandatory for new commercial and government buildings in 2023.
Cheap lime wash works but fades fast; proper acrylic or elastomeric coatings last 3-5 years.
Cool roofs help top-floor homes and tin-roof houses most; ground floors gain little.
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