Keeping your business cool
During the summer, it is important to have the building cool for both your customers and your employees. If the roof has the wrong type of coating or material, it can make for either a miserable summer or a high cooling bill. To combat that, in parts of the country where the summers can get brutal, many business owners have had a cool roof installed.
During those incredibly hot summers, the harder the HVAC system must work, the more expensive those cooling bills get and the shorter the lifespan of our HVAC system. Or, you can be the type of boss or owner that sets the thermostat at the “proper” setting, then your customers and employees will be miserable and uncomfortable. A cool roof in summer can help you, and your HVAC system, combat those rising temperatures, which in turn, will save you money and extend your HVAC system’s life. As a bonus, your customers and employees are comfortable!
So, maybe you’re asking exactly what is a cool roof? A cool roof is designed to reflect the UV rays and absorb less heat. It is solar reflective with a higher albedo, meaning it reflects the sun more than a traditional roof. A cool roofing system has a high thermal emittance and can radiate the heat it absorbs out and away from your structure.
Well, what is the difference between cool roof vs green roof? Where a cool roof reflects the sun and its UV rays and radiate the heat it does absorb back out into the atmosphere, green roofs absorb the sun’s UV rays and the heat from those rays before it gets inside the structure while it helps stabilize the air and maintains a close ambient temp.
Do Cool Roofs work?
The traditional roof materials are dark-colored and absorb heat from the sun’s UV rays, thus, they are warmer and that radiates into the building. A cool roof though, reflects the sun more, absorbing less heat and therefore, transmits less heat into the building.
So, if you’re located in a part of the country where the summers get brutally hot with high temperatures, yes, a cool roof will work great for keeping the heat down inside your building.
What is the coolest roof material?
We have become more aware of how rooftops of buildings can be a big contribution to excessive temperatures during the summer months, especially in certain geographical areas. Up to 90% of roofs in America have a poor design that includes roofing material that is dark, non-reflective and absorbs heat. In certain climates, a rooftop can reach 90 degrees above the current air temperature. That increase in the heat makes the HVAC system work harder to keep the building cooler. The harder the HVAC system works, the more expensive the energy bills get.
With all of this in mind, business owners are constantly looking for ways to cut back that expense, including going that extra expense of replacing their current roofing material with something that offers a cooler rooftop. With a Solar Reflex Index (SRI) of over 50%, clay tiles have become a popular choice. Not only are clay tiles extremely durable and 100% recyclable, but they also provide over 85% thermal emittance.
Does roof color affect temperature?
Commonly, a light-colored roof will reflect the sun’s heat rays away and a dark-colored roof will absorb a lot of the heat and transmit it into the structure below. However, color isn’t the only characteristic that affects a building’s temperature.
Another characteristic that affects your roof’s temperature is the roofing material. For instance, an asphalt shingled roof is less heat-reflective than metal roofs or rubber roof materials. What this means asphalt shingles in tan may reflect more heat than black shingles, but it won’t reflect as much as a brown metal roof.
So, while you have a light-colored asphalt shingled roof that is reflecting the summer heat, during the winter, a darker roof is allowing more heat from the UV rays. If you live in a colder climate where the winters are longer than the summers, you’re better off going with a dark-colored roof no matter the material.
What color roof is the most energy-efficient?
There are two properties that a roof is measured by
- Thermal Emittance
A white roof, or a cool, will reflect heat better than a dark-colored roof and in terms of thermal emittance, a cool roof will deflect the heat it has absorbed better.
Roofs are measured by two properties: reflectivity (the ability of the roof material to reflect light energy away from the roof) and thermal emittance (the ability of the roof material to deflect absorbed heat). The ideal roofing color and material will do both. A high Solar Reflectivity Index of at least 70% for a flat roof is ideal, and a cool roof coating and paint can help in making this possible.
How much energy does a cool roof save?
For an average-sized, one-story commercial building, a cool roof can save the business as much as 15% on energy bills to cool the building. However, there are many other cool roof advantages and disadvantages as well, such as:
Advantages of a Cool Roof
- Convenience – With or without air conditioning, a commercial property will be more comfortable when the property is kept cooler in the summer. In a 2-story business, the chimney effect will make the upstairs warmer. When you combine that with the heat a traditional roof absorbs, the upstairs can be unbearable for sleeping.
- Roofing Life Extended – The extreme heat that some areas of the country experience will degrade a roof quickly, especially with asphalt shingles. A cool roof will protect your roof from those unbearable UV rays and extend the roof’s lifespan.
- Rebates – Some municipalities and utility companies offer refunds for energy-efficient roofing.
Downsides of a Cool Roof
- Lighter colors show algae streaks, dirt, and grime faster.
- Heat requirement increases in the winter, meaning your furnace will need to be working condition.
A cool roof will not only help with energy bills and ease the strain on your HVAC system. Today, part of being a responsible business owner is being sustainable responsible too. Considering a cool roof for your commercial property in La Porte & Baytown, TX? Call 12 Stones Roofing at 832-815-9463 today!