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Absorptivity of different roofing materials - Surface temperatures vs. solar absorptivity of horizontal surfaces of paints, roofing materials, roadways and cities, adjusted to noon on a clear windless summer day in Austin, Texas. Outside ambient air temperature is 32°C (90°F). Surface temperatures of white and black surfaces can vary as much as 45°C. Read More

Acrylic Coating - This research paper explains the process of asphalt degradation over time and reveals the performance of acrylic maintenance coatings, site aged for six to 10 years, over both BUR and shingle roofs. The application of acrylic coatings to protect new systems and preserve existing
membranes has become an important part of the services the professional roofing provides to the building owner. Read More

Acrylic Roof Coatings Reduce Air-Conditioning Load - Rohm and Haas Company have been investigating the use of white acrylic roof coatings to reduce air conditioning demand since 1981. Early "birdhouse" experiments clearly demonstrated that white elastomeric roof coatings could reduce the internal temperature of un-insulated and poorly ventilated buildings significantly. Moreover, the coatings could prolong the life of a roof by protecting the asphalt roofing material below from degradation by heat, sunlight, water, and thermal shock. It became readily apparent that the degree of dirt pickup resistance had a dramatic effect on the solar reflectivity and ultimately the air conditioning energy demand. Simply stated, the longer the roof coating retained its white appearance the better its effect in reducing the building heat load To qualify this, a novel laboratory technique was developed to predict the relative dirt pickup of typical thermally reflective coatings. Read More

Albedo - Albedo, or solar reflectance, is a measure of a material's ability to reflect sunlight. Albedo includes the visible, infrared and ultraviolet wavelengths on a scale of 0 to 1. An albedo value of 0.0 indicates that the surface absorbs all solar radiation, and a 1.0 albedo value represents total reflectivity. EPA ENERGY STAR specifies an albedo of 0.65 or higher for low-slope roof applications and 0.25 for sloped roofs. Read More

Durability of High-Albedo Roof Coatings - Data indicate that most of the albedo degradation occured within the first year, and even within the first two months. On one roof 70% of one year's albedo degradation occured in the first two months. After the first year, the degradation slowed, with data indicating small losses in albedo after the second year. Measurements of seasonal cooling energy
savings by Akbari et al. (1993) include the effects of over two months of albedo degradation. We estimate ~20% loss in cooling energy savings after the first year because of dirt accumulation. Read more

Alternative to Roof Replacement - For roofing jobs on existing buildings, the question faced by the roofing professional still remains the same: should an expensive new roof be installed or is there a roof replacement alternative which will prolong the life of the existing roof? The answer may be a liquid applied roof coating over the existing aged roof. Read More

Asphalt Shingles - Asphalt shingles are a very economic roofing choice, which have a large share of the
market, including most houses with sloping roofs. From a reflectance point of view, they are very similar to rolled asphalt roofing, which is often used as the top layer of low slope roofing. These materials are composed of asphalt saturated mats made from organic felts or fiberglass. The asphalt is protected from the sun's UV light by roofing granules pressed into the shingle while it is hot (and soft). The roofing granules are 1 millimeter-sized stones (e.g., of crushed granite), which are coated with an inorganic silicate material. The
coating contains microscopic pigment particles, similar to those used in paint, to provide color. Read More

California title 24 regulations - The Energy Efficiency Standards for Buildings passed into law in 1978 - was updated effective October 1,2005. The purpose of the law is to reduce energy consumption in California, particular the peak energy demand that attributed to rolling blackouts of 2000 and 2001. Read More

Ceramic Coatings / Elastomeric Coatings - The project objectives included evaluation of both types of white coatings: latex-based products with ceramic beads added and acrylic elastomeric products. Both had titanium dioxide added to increase solar reflectance. The ceramic beads are clear borosilicate
microspheres which, when added to the latex base, decrease the density of the coating. The beads did not appear to affect solar reflectance one way or the other. They did make it difficult to brush coat small sections on the roof of a fast food restaurant at Tyndall AFB, selected for its smooth-surfaced, single-ply membrane roof. Applying the ceramic coating left brush marks. An acrylic elastomeric coating brushed on smoothly next to the
ceramic for side-by-side comparison of performance. The ceramic-coated patches seemed to attract dirt more than the smoother acrylic. When the coatings were fresh, the two coatings had nearly equal solar reflectances and performed the same, but the ceramic performance deteriorated more quickly in this situation. At our outdoor roof test facilities. Read More

A closer look at Energy Star - Read more    
       

Comparative Evaluation of the Impace of Roofing Systems - The Florida Power and Light Company
and the Florida Solar Energy Center instrumented six side-by-side Habitat homes in Ft. Myers, Florida with
identical floor plans and orientation, R-19 ceiling insulation, but with different roofing systems designed to reduce attic heat gain. A seventh house had an unvented attic with insulation on the underside of the roof deck rather than the ceiling. Read More

Cool construction materials - Modern urban areas usually have darker surfaces than their surroundings. Use of dark roofs and pavements affects the climate, energy use, and habitability of cities. At the building scale, dark roofs are heated by the summer sun and thus raise the summertime cooling demand. Read More

Cool Roofs - Dark materials absorb more heat from the sun--as anyone who has worn a black t-shirt on
a sunny day knows. Black surfaces in the sun can become up to 70°F (40°C) hotter than the most reflective white surfaces. If those dark surfaces are roofs, some of the heat collected by the roof is transferred inside. Read More

   
   
   
   
   
   
   
   
Roof Coatings and Cold Weather
   
Roof Coatings in a New Light
   
   
   
 

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