Roof Coatings & Elastomeric Coatings

Roof Coatings serve the dual purpose of protecting and sealing a roof from the elements as well as reducing the amount of solar heat gain in a commercial structure, which helps reduce cooling loads and maintain indoor air temperatures.

Roof coatings, also called elastomeric coatings, reflect the sun’s heat back to the sky instead of transferring it to the building below.  “Coolness” is measured by two properties, solar reflectance and thermal emittance.  Both properties are measured from 0 to 1 and the higher the value, the “cooler” the roof.

Roof Coatings and Elastomeric Coatings can:

  • Reduce building heat-gain, as a white or reflective roof typically increases only 5–14 °C (10–25 °F) above ambient temperature during the day.

  • Create 15–30% savings on summertime air conditioning expenditures.

  • Enhance the life expectancy of both the roof membrane and the building’s cooling equipment.

  • Improve thermal efficiency of the roof insulation; this is because as temperature increases, the thermal conductivity of the roof’s insulation also increases.

  • Reduce the demand for electric power by as much as 10 percent on hot days.

  • Reduce resulting air pollution and greenhouse gas emissions.[5]

  • Provide energy savings, even in northern climates on sunny (not necessarily “hot”) days.

Mills Paint Contractors is proud to install R.M. Lucas roof coatings and elastomeric coatings.

Traditionally, most roofs in large cities have been flat and black.  At best they would have been covered with gravel.  Black roofs absorb as much as 90% of solar energy and can get as hot as 80ºF above ambient air temperature.  Gravel roofs reflect a small portion of solar energy and get less hot, but they retain much of the heat they absorb after the sun has set because of their higher mass.

Hot roofs cost money.  When a roof gets hot, it radiates heat into the interior of the building.  This increases the cooling  load on the building’s air conditioning system.  At the same time, roof mounted air conditioning units operate less efficiently because the air temperature on the roof is elevated and the unit’s ability to exchange heat is reduced.  While there is a slight winter heating benefit from dark roofs, it is mitigated because the sun is lower in the sky during winter months, there is often white snow cover on the roof  surface and the fact that heating systems are unaffected by air temperature over the roof’s surface.

The US EPA Energy Star program has recognized the effectiveness of “high albedo” reflective roof systems.  These white roof coatings reflect heat off of buildings and result in roof surface temperatures as little as 10ºF above ambient air temperature.  Roof top air temperatures average less than 5ºF over the ambient air temperature.  White roofs have been proven to lower interior building temperatures by about 5ºF.

Average cooling cost savings with white roofing is 15%. Although recognized as “Energy Star”, Lucas Coatings are primarily waterproofing products that offer building owners affordable, tax deductible, roof maintenance and restoration options at far less cost than the traditional tear-off and replacement cycle.

“A tax deduction of up to $1.80 per square foot is available to owners or designers of new or existing commercial buildings that save at least 50% of the heating and cooling energy of a building that meets ASHRAE Standard 90.1-2001. Partial deductions of up to $.60 per square foot can be taken for measures affecting any one of three building systems: the building envelope, lighting, or heating and cooling systems. These tax deductions are available for systems “placed in service” from January 1, 2006 through December 31, 2013.” Souce:

Contact Mills to learn more about the benefits of roof coatings and elastomeric coatings.


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