Table of Contents
- Is it beneficial to have a white roof?
- Why are house roofs painted white?
- Are white roofs cooler?
- Is a white roof better than a black roof?
- What Effect Does Exterior Color Have on Home Temperature?
- Why is the colour of your commercial roof important?
- What is the difference between white and black roofs?
Installing white roofs has long been considered to help mitigate heat accumulation in towns. However, recent evidence suggests that making surfaces more light-reflective may significantly reduce high temperatures in the suburbs and rural areas.
It has long been established that building white roofs helps mitigate heat accumulation in cities. However, recent research suggests that making surfaces more light-reflective can significantly reduce high temperatures in the suburbs and rural areas.
Cool roofs are usually painted white since lighter surfaces show more light than darker ones. This reduces the air and surface temperatures, allowing less thermal energy to enter the house.
This method, known simply as “cool roofing,” is intended to minimize solar radiation consumed, resulting in less heat being transmitted within the house. For example, it discovered that a clean white roof that mirrors 80 percent of sunlight would keep you 31 degrees Celsius cooler on a hot summer afternoon.
It may be enticing to begin planning your commercial roof by selecting a colour, but the look of your roof is just one of several factors to consider. White and black roofs have vastly different properties and are also more or less suitable for the building based on where you live and the surrounding conditions and temperatures.
There has long been a controversy about black and white commercial roofs. Still, the environmental advantages of ‘exposed-membrane, low-sloping roofing systems with high solar reflectance and thermal emittance have also been well known by the Cool Roof Rating Council (CRRC). This means that white roofs or roofing with white surfacing decreases solar radiation (heat) absorbed by roofing surfaces, reducing the amount of energy needed to fuel cooling systems and contributing to global warming.
All of this being said, you might instinctively say, ‘then a white roof is best,’ but there’s a lot more to it than that.
White is a popular choice for exterior paint to keep your home cool. It brightens the appearance of your home and reflects light, and thus heat, from the sun. If you have high cooling costs during the summer, a white house may be the solution.
Having a white commercial roof can result in higher heating costs for those who live in colder climates. This is because the less heat your roof absorbs, the more you will have to rely on your heating system to keep the building warm. Another explanation white roofs are unsuitable for northern climates is snow and ice. Snow and ice are more likely to accumulate and build upon a colder roof, which can be dangerous if you live in a region with heavy snowfall during the winter.
White roofs tend to remain frozen and snow-covered for extended periods, making mechanical unit maintenance unsafe or impossible. In addition, ice and snow that lingers on white roofs are often more likely to slide off sloped roofs and cause harm.
As you will see, the colour you choose would be heavily influenced by your environment, but it might not be as easy as white roofs for southern buildings and black roofs for northern buildings.
Black roofs are well-known for their ability to trap a large portion of the Sun’s heat energy, causing the roof surface to become excessively hot. They are usually made of rubber or EPDM roofing. On the other hand, white roofs reflect most of the Sun’s heat energy, cooling the roof surface. White roofs are usually made of TPO or PVC. That ensures that black roofs in the Northern United States could have lower heat costs during the winter relative to buildings with white roofs in the North. In addition, white roofs remain cooler, theoretically providing lower cooling costs during the summer.
Is this a good thing to have a black roof in winter while a white roof in summer is better? Not necessarily.
Other considerations in choosing between a white and a black commercial roof
When deciding on a roof colour, one should consider some other factors: house proportions, geography/climate, and the volume of insulation in the new/existing roof must all be weighed. Leaving the choice of black and white to chance may be an expensive mistake.
In general, it would be possible to achieve the best outcomes if the colour of the roof is matched to the environment. However, the building proportion and roof surface ratio will also influence energy efficiency, heat conservation, etc. You will make the best possible choice for your commercial building in contact with a professional roofing contractor, and please do not hesitate to let us know if we can assist you.