First, long service life:There are 15um and 5um paint film in the front and back of color coated aluminum roofing sheet,which can be used for more than 20 years in the inland area. and the color coated steel roofing sheet will have 10 years service life, even it needs the surface zinc thickness 60g, the front 20um paint film (silicon calcium paint), the back 10um paint film.
The advantage analysis of color coated aluminum roofingsheet: the price of color coated aluminimum coated roofing sheet is about 15000RMB (including tax), color steel price is about 5000 RMB (including tax), color coated aluminum is three times of color coated steel prices, the service life is two times.For 20 years as the example , color coated steel sheet requires the demolition and reconstruction, and then removed again then install it again, two times the installation of color coated steel sheet will be 10000 RMB, removal and installation costs 5000 RMB, 15000 RMB in total. And with the development of society and economy,labor costs will be higher, as well as in the disassembly process, the production can't be continue in the workshop.
Second, The surface effect is good: Due to the characteristics of the aluminum sheet, there is no texture on the surface. The process of paint coating determines that its finished surface is smooth and flat, and it won't be sticked to dirty. and they have bright colors during the use. Because the surface of zinc coated steel substrate will have zinc flower and stretch straightening. After finishing, the surface texture will be deeper. Even if the light colored paint is covered, it will even produce zinc flower background and affect the appearance.
Advantage analysis: colour coated aluminum roofing sheet can be painted with color ,that cannot be painted by losing gloss. It will not cause serious color and visual errors of surface texture after sunlight diffuse reflection because of similar color steel sheet's tension and straightening. The sun reflects well and can prolong the service life of the paint.
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