The roof system made with color coated steel coils can add color to other architectural elements, and also can obtain the extensiveness change effect caused by roof sheet spoke and joint. The roof gradient of color coated steel coil building is more steep, the typical value is 3:12 or higher, in order to facilitate rapid drainage of rain. Roofs with small slopes are not easy to see, it always choose the galvalume steel sheet. For the roof with smaller than 1/4:12 gradient, it is more economic to use galvalume steel sheet. CAMELSTEEL found on the research data, there has a fact to show that it can still keep excellent performance after 20 years use. The roof panels are usually not placed directly on the purlin but placed on the skeleton, and the skeleton can be wooden or steel. Between the roof and the bracket is usually put 30 pounds thickness of paper or similar material. Part of the colour coated roofing sheets can design into a roof structure in direct contact form. The roof panels always in flat shape, and the width is 10~24 feet. We can also use a penetrate steel plate’s fastener or a concealed clip to secure the plate to the skeleton.