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Updates found with 'roofing corporation pvt ltdis'

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Updates found with 'roofing corporation pvt ltdis'

MAXROOF - Reflective index for roofing material and the right colour for roof to get maximum solar reflectivity.It’s a fact that buildings are a major consumer of energy. While it is recognized that cooling and heating costs can be reduced by adding insulation under the roof surface, there is a diminishing return on the strategy of increasing insulation to conserve energy costs. This is where “cool roofing” can play a role in further reducing the energy consumed, and in minimizing the Heat Island effect created in the big urban cities. Cool roofing relies on the properties of reflectivity and emissivity of the roofing material. ReflectivityReflectivity is the ability of the roof to reflect solar radiation back into the atmosphere. Its primary measure is solar reflectance - the proportion of the total solar radiation that is reflected back to the atmosphere. Any solar radiation that is not reflected is absorbed into the building envelope, requiring further energy to cool the building; or partially convected into the atmosphere increasing the ambient air temperature in the surrounding environment (Heat Island effect). The measure of reflectivity is the Solar Reflectance Index (SRI), which takes into account the properties of the material as well as the cooling effect of wind passing over the roof. The SRI for a low slope roof will be 0 for standard black (reflectance 0.05, emittance 0.90) and 100 for standard white (reflectance 0.80, emittance 0.90).EmissivityEmissivity is the ability of the roof to re-radiate absorbed solar infrared radiation back to the atmosphere. This takes place at all times, but mostly at night. Its measure is Infrared Emittance - the proportion of absorbed infrared solar radiation that is re-emitted back to the atmosphere. For prepainted sheet steel colors, the emissivity is generally high and close to 0.90 galvanized steel materials where there has been rainwater run-off or dripping from pre-coated galvanized steel roofs and glass roofs (greenhouses). Properties of Prefinished Sheet SteelPrefinished sheet steel is a coil-coated product manufactured under stringent quality control in a modern coating factory. Coil coating is a precise, multi-step process that applies paint coatings to specially prepared sheet steel in a continuous operation. There are a variety of paint systems available (e.g. polyesters, fluorocarbons, plastisols) to suit the needs of the consumer and the environmental conditions. Each paint system and color can have different reflectivity depending mostly on pigment quality. 50% of sunlight is visible (colorvision) and 50% invisible (UV and near infrared). The reflectivity can then be improved by modifying the thermal property of the paint in the invisible part of the sunlight without modifying the color.The following definitions apply to these tables:TSR = Total Solar ReflectanceSRI = Solar Reflectance Index calculated at the Medium wind condition per ASTM E1980, Standard Practice for Calculating Solar Reflectance Index of Horizontal and Low Sloped Opaque Surfaces. Table 1. Typical Solar Reflectance Values for Silicon Polyester Painted SteelColor Description TSR SRIWHITE 0.58 68LIGHT GREY 0.46 51DARK GREY 0.37 39TILE RED 0.31 31BROWN 0.27 26GREEN 0.27 26ROYAL BLUE 0.24 21NAVY BLUE 0.12 6BLACK 0.05 -1 For more info visit us at http://steelroofingmanufacturerpune.com/bizFloat/5981b4ae63cc370b08e6c543/MAXROOF-Reflective-index-for-roofing-material-and-the-right-colour-for-roof-to-get-maximum-solar-reflectivity-It-s-a-fact-that-buildings-are-a-major-consumer-of-energy-While-it-is-recognized-that-
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WHY COLOUR COATED GALVALUME IS BETTER THAN GALVANISED ?Galvalume® was invented by Bethlehem Steel in 1972. It is a trademarked name, but many people use it as a generic term to describe a metal roofing product consisting of steel coil coated with a metal alloy. That alloy is 45% zinc and 55% aluminum and looks similar to galvanized steel, but the visible crystals are smaller and close together, giving it a smoother appearance. The combination of zinc and aluminum in Galvalume enhances both the positive and negative effects of aluminum. Galvalume has barrier corrosion resistance and heat resistance similar to aluminized material and good bare edge galvanic protection and forming qualities like galvanized material. Galvalume® is more corrosion-resistant than galvanized steel, but because aluminum provides barrier protection instead of galvanic protection, scratches and cut edges are less protected. Galvalume is offered in both bare and pre-coated versions. Most Galvalume®–like galvanized steel– is coated. But Galvalume has an excellent performance life in bare exposures as well. Both galvanized steel and Galvalume® weigh 100 to 150 pounds per 100 square feet and contain about 35% recycled materials. The cost of Galvalume and Galvalume Plus are about the same as that of galvanized steel.The coating used on Galvalume is very important because it is critical to the length and conditions of the entire warranty of the panel product. Coated metal roof panels have progressed from a single coat straight polyester paint system in the early years to Poly vinyl idene fluoride(PVDF) acknowledged as the premium resin for coil coatings. It is a kind of fluoride, a family that includes such well known products as Teflon and Halar. PVDF resin has superior chalk resistance and gloss retention as well as stain and chemical resistance. It is softer than polyester, making it highly formable without risk of cracking. Current pre treatments and primers along with superior paint coating have increased product warranties dramatically.Galvalume roof with snow guards close up.However, some people only ask if there is a warranty not how many years the warranty lasts, and most people do not check to make sure that they are not getting the inferior straight polyester system. Straight polyester should really not be used for metal roofing and wall panel in today’s market. If you see there is a dramatic difference in the price of two painted Galvalume panels you are specifying, then the less expensive, less effective kind of coating should be suspected.Galvalume should not be used on, in, or around concrete or mortar. Concrete and mortar are highly alkaline environments. Bare Galvalume and painted Galvalume sheets suffer rapid corrosion when in contact with mortar and concrete. Bare Galvanized and painted Galvanized perform better in this type of environment.Neither Galvalume or galvanized substrate is warranted to be used, in or around animal confinement or agriculture. Bare Galvalume and coated Galvalume panels will very rapidly deteriorate when exposed to the corrosive agents of animal confinement. But bare Galvalume and coated Galvalume panels have an outstanding corrosion resistance in a wide variety of general environments, including industrial, marine and even severe marine environments. And Galvalume offers exceptional heat reflectivity, resulting in lower energy load on buildings and improved interior comfort.That pretty much summarizes the key features of Galvalume versus Galvanized. In a nutshell, Galvalume is a proven metal roofing material because of its strength, outdoor corrosion resistance and longevity. If you have any other questions about Galvalume, www.maxroof.insales@maxroof.in / contact@maxroof.in8408880099
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