Problem of many people roofs An example of buildings located in cities (as well as isolated houses) is: they trap a lot of heatIt turns the house into a real stove in the middle of summer. This is one of the factors that caused the ‘ incident.heat island effectIn cities where the temperature in the city center is several degrees higher than in the rural environment. But there is a way to eliminate this heat source, and it is the so-called ‘cold roofs’.
Although it is a technology that has been around for years, it is now starting to become the focus of attention of architects, urban planners and planners as global warming hits with its full force. And it is a powerful weapon against climate change.
Dark roofs not only reflect sunlight, they also absorb it This means that the roof does not lose its heat during the night, but rather retains it, making it difficult for the occupants to fall asleep.
Dark ceilings have the following disadvantages:
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Increased energy consumption for cooling and high electricity bills;
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Reduction of interior comfort;
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Rapid deterioration of roofing materials, increasing cost of roof maintenance, and large amounts of roofing waste being dumped in public landfills.
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Increased peak electricity demand due to the need to use air conditioning or similar systems.
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As a result of the above, more CO2 emissions into the atmosphere occur.
Historically, cold ceilings are light colors or directly white. However, in recent years, products that retain their cold roof properties even if their color is dark have also been developed.
A cold roof is above all offers more sun reflection (ability to reflect visible, infrared and ultraviolet wavelengths of the sun, reducing heat transfer into the building) and higher thermal dissipation (ability to radiate solar energy that is not absorbed or reflected) than conventional roofs.
Advantages of cold roof
According to various studies, A cold roof can reduce the interior temperature of a building by 2°C to 7°C.This makes a significant difference.
2010 Berkeley Lab study, based on NASA dataCool roofs offer the following advantages:
· Cooler outside air: They lower the temperature of city air, thus softening the ‘heat island’ effect in the city as a whole.
· Less emissions from power plants: Reduces electrical energy demand for air conditioning and other cooling systems, which reduces greenhouse gas emissions.
· Better air quality: They help stop ozone formation in the soil.
· Slowing of climate change: Less heat is absorbed at the Earth’s surface.
· Energy and cost savings: Electricity bills for cooling buildings are reduced in the summer months.
Some companies already market dark-colored cool roofing materials that reflect up to 25% of the sun’s energy, twice as much as traditional shingles.
Experts underline this need Public administrations force construction companies to implement cold roofs by default in all cities, especially in the regions of Spain most exposed to extreme heat. Traditionally, buildings in many regions of the south and east, such as Andalusia, the Valencian Community or the Balearic Islands, were painted white and used climate-neutral materials for the roofs. However, these practices were abandoned, popular opinion was cornered and Modern materials harm the population and show their weaknesses.
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