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Paint your roof white

The simplest, most cost-effective way to cut heat gain in a building.

CoolMaps › Cool Tips Pro › Paint your roof white

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Quick answer

Painting a roof white or applying a reflective coating bounces back up to 90% of solar radiation and can cut cooling costs by 20–30%.

A dark roof can reach 70–80°C (160–175°F) in peak summer. Painting it white — or applying a reflective coating — bounces most solar radiation back instead of absorbing it, a principle used for centuries in hot climates from Greece to Morocco.

90%of radiation reflected

20-30%lower cooling costs

10-15°Ccooler roof surface

🔬 How it works

A reflective 'cool coating' raises the roof's albedo. Less solar energy is absorbed by the structure, so less heat is transmitted to the floors below — cutting the need for mechanical cooling.

✅ Key benefits

Meaningfully lowers indoor temperature with zero energy use
Measurable drop in air conditioning bills
Extends roof membrane lifespan (less thermal expansion/contraction)
Helps reduce the urban heat island effect neighborhood-wide

🛠️ Getting it done

Have the current roof waterproofing inspected before any treatment
Choose a certified reflective paint or membrane (high solar reflectance index)
Use a professional applicator to ensure proper adhesion and durability
Plan annual maintenance/cleaning — dust and pollution reduce reflectivity over time

💡 ROI: the cost typically pays for itself within 2–5 years through cooling savings, depending on building size and climate.

⚠️ Confirm the product is compatible with your roof type (metal, bitumen, concrete) and check local planning rules, especially in heritage zones.

❄️ Add your spot to CoolMaps

Once the work is done, let your community know.

Add a Cool-Spot ➕