Best of all, green roofs are considered energy efficient and naturally reduce the heat island effect. They also add oxygen to the air again, making them particularly important for large urban areas and areas experiencing high traffic congestion. These roofs do much more than just keep the sun off your back. A cold roof is designed to reflect more sunlight than a conventional roof, absorbing less solar energy.
This lowers the temperature of the building just as wearing light-colored clothing keeps you cool on a sunny day. Conventional roofs can reach temperatures of 150° F or more on a sunny summer afternoon, sunshine. Under the same conditions, a reflective roof could remain more than 50° F (28° C) cooler. This can save energy and money in buildings with air conditioning, or improve comfort and safety in buildings without air conditioning, by reducing heat flow from the roof to the occupied space.
Most cold roofs have a high “thermal emittance”, the ability to dissipate heat by emitting “thermal” infrared radiation. Almost any type of building can benefit from a cold roof, but consider the weather and other factors before you decide to install one. If you have a steeper slope, shingles, shingles, and metal are great options to consider. Asphalt shingles have small granules that help reflect sunlight.
It is best to choose a lighter colored tile to further reflect light and heat. Clay tiles are great in hot climates because they allow a small air flow between the tiles. The latest painted metal ceilings are also an excellent option for reflecting light. Even a roof made of white reflective material can be warmer than the surrounding air temperature between 10 and 15°F.
While a metal roof is a significantly larger investment than an asphalt roof, the energy savings in your home, combined with the potential for higher resale value, can make it a worthwhile investment for new construction or roof replacement. Heat-resistant, fire-impervious, and available in bold earth tones, clay tile roofs are an attractive option for homeowners who love rustic architectural nuances and want to beat the heat. Metal roofing can be a great way to reflect much of the sun's heat and energy without the added cost and weight of slate and tile. Clay shingles may be more expensive than other forms of roofing, but their longevity can make them more cost-effective in the long run.
The use of poured concrete slab roofs is a low-cost option in many developing countries as it provides protection against bad weather and pests. Certain types of roofing products can also be retrofitted with cold coatings, but this will lead to additional material and labor costs. Aluminum roofing coatings can reflect as little as 50% or more than 70% with some high-end premium models. Some premium cold roof manufacturers, such as Ecology or Sika-Trocal, make membrane roofs that repel more than 80% of solar energy.
The warmer the ceiling, the harder it is to stay cool indoors, and the harder the air conditioning unit must work to keep your home at a comfortable temperature. Built Up Roofing (BUR) is a method for applying cold roof surface coatings to traditional asphalt or tar roofs. Green roofs are ideal for urban buildings with low or shallow slope roofs, and can include anything from basic vegetation cover (extensive vegetative roof) to a garden. In hot climates, where cooling costs make up the bulk of homeowners' energy bills, energy-efficient aluminum roof systems include integral air space between the metal panels and the deck.
Roof tests conducted by Florida Power & Light Company in Florida's hot, sunny and humid conditions show that white S-shaped shingles made of concrete are very effective in keeping the heat of the sun out of homes. While popular, asphalt and wood shingles are not best for areas experiencing triple-digit temperatures. Using the pigment database and model, the team is developing design software for the roofing industry that deals with cool color coatings. .