1. What is a cool roof?
Cool roofs are highly reflective and emissive materials that stay 50 to 60 degrees Fahrenheit cooler in the summer sun, thereby reducing energy costs, improving occupant comfort, cutting maintenance costs, increasing the life cycle of the roof and contributing to the reduction of urban heat islands and associated smog.
2. Why is it important?
Cool Roofs are a simple and powerful way to reduce global warming, by using white or light colored rooftops that reflect the suns energy, instead of dark colors, which absorb it. They save money, they save energy, they reduce CO2 emissions and they reduce global warming. Similarly, by coating an existing roof instead of replacing it, there is no material to be added to the landfill and reducing the carbon footprint associated with the project.
3. What are the benefits of a white coating?
• Reduced energy use: A cool roof transfers less heat to the building below, so the building stays cooler and uses less energy for air conditioning.
• Reduced air pollution and greenhouse gas emissions: By lowering energy use, cool roofs decrease the production of associated air pollution and greenhouse gas emissions.
• Improved human health and comfort: Cool roofs can reduce air temperatures inside buildings with and without air conditioning, helping to prevent heat-related fatigue and promote a more productive workplace.
• Reduced operating temperature of the roof surface, which vastly extends the life of the roof. On a hot day (80 degrees), the temperature of the roof can quickly get up to 130 degrees, and at night, down to 50 degrees. That 80 degree change in temperature is traumatic on the membrane as the roof stretches and contracts with the thermal shock. A cooler roof, one that only peaks at 85 degrees versus 130 degrees, will stretch and contract less with the 35 degree temperature range and last longer since it undergoes such significantly less stress day in and day out.
4. What is elastomeric?
An elastic substance occurring naturally, as natural rubber, or produced synthetically, as butyl rubber or neoprene.
5. How can an industrial coating be environmentally friendly?
Thanks to the reduced energy consumption of buildings with cool roofs applied, their greenhouse gas emissions are lower. Their reflective properties also help reduce the urban heat island effect.
6. What makes a good candidate for a reflective coating?
Any existing roof that is still viable as a membrane since a good membrane that is intact is worth saving. Any UV degradation will be stopped by the coating as the heat and sun are now directed away from the roof membrane. This will save the existing roof along with saving money by not having to replace it which is always a more costly expense. As long as the membrane is watertight, a high quality coating can extend the life of the roof indefinitely with continued maintenance and re-coats.
7. What types of roofs can accept a coating?
Single-ply Membrane, Built-up Roof, Modified Bitumen, Metal Roofs, Spray Polyurethane Foam, Asphalt Shingles, Tile Roofs, Tar and Gravel Roofs - almost any substrate can have a cool roof applied.
8. Why is a coating a better idea than a full re-roofing?
As a building's roof deteriorates over time, there are other options for extending the roof's service life compared to an expensive roof replacement. Elastomeric roof coatings can extend the roof's performance life for another 10-20 years. Roof coatings are renewable; they can be rejuvenated simply by applying new top coat to replace any sections that have deteriorated.
9. How long will a coating job last?
If properly applied, Davlin's Cool Roof coatings can last up to 20 years, vastly outlasting competitor's coatings.
10. How do Davlin products rate compared to other Coating companies?
Davlin's Cool Roof coating is graded to reflect over 80% of solar energy and 90% of thermal emittance – making it the second highest rated coating in the CRRC.
11. Will it really save money on cooling costs?
According to studies conducted in California, cool roofs offer a yearly savings of roughly 50 cents per square foot. The average American home is approximately 2250 sq/ft, equating to an approximate savings of $1125 annually.
12. If Cool Roofs reflect heat, won't it increase my heating costs in the winter?
No. The roof is an insignificant source for heat gain in winter. While cool roof owners may pay slightly more to heat their homes, this amount is usually insignificant compared to the cooling energy savings during the summer. This is largely because the sun is much lower in the sky and less intense during the winter months (Passive solar heating usually occurs from sunshine streaming through windows this time of year). There is a higher incidence of cloudy days, and in some regions the roof is covered in snow for long periods. Winter days are shorter (fewer hours of sunshine) A cool roof will not shed more heat proportionate to other types of roofing materials at night or on cloudy days. It will simply limit the amount of heat entering the building on hot summer days.
13. Are rebates available for Cool Roofs?
In addition to energy and life cycle savings, rebates are available from many utility companies for cool roofing. Contact your local utility provider for more information. Currently, certain kinds of residential cool roof projects are eligible for a Federal Tax Credit of 30% of materials, up to $1,500. Nonresidential building rebate programs can be more complicated, and may also include other efficiency measures besides cool roofs. Contact the rebate program agencies to determine the probable savings associated with a cool roof rebate.
14. In looking at the benefits of installing a white metal roof to reflect heat from a building, wouldn't leaving the metal its natural silver color reflect better?
No. White is superior in terms of heat buildup. Unfinished metal roofs can get very hot, so whatever heat unfinished metal roofs absorb from the sun is not readily lost back to the exterior environment because unfinished metal surfaces do not lose heat by radiation very well. This results in high surface temperatures so that even the apparent reflectivity advantage of these roofs is not realized. A cool roof coating can radically affect the temperature of a metal roof. Radiation to the sky is a major part of the cooling process for exterior building surfaces, even while the sun is shining. Remember, there is more occurring in the heat transfer process than what you can judge accurately with your eyes. You see less than half the energy in sunlight and even much less of the total energy transferred by radiation.