1. color-coated roofing roof installation project should not overlap color-coated, when must the lap, lap should downslope direction of color-coated colors, overlapping points should fall on purlins or other support, take pick a length not less than 250mm; 2. Cross slope direction two silver color coated roof seams should be on the surface of the adjacent two plates each greater than or equal upward flange 25mm, on which undercut groove connection fittings, seals adhesive caulk; 3. All lap seam and exposed nail heads must be closed with a sealant or waterproof material; 4. pipeline crossing at the roof, should be prepared to deal with waterproof technology. Color-coated grades, consisting of pre-painted symbols and code base characteristics of the substrate type code in three parts, the third part is a two-digit number, namely 52, 53 and 54; the fourth part is the letter "D", on behalf of Redu. b) structural steel consists of four parts, of which the first part of the letter "S", on behalf of structural steel; the second part is the three figures, representatives of the specified minimum yield strength (in MPa) Boxing caitu, namely 250 , 280,300,320,350,550; the third part is the letter "G", on behalf of the heat treatment; fourth part is the letter "D", on behalf of Redu. Substrate type code "Z" on behalf of galvanized substrate, "ZF" on behalf of galvanized iron alloy substrate, "AZ" on behalf of hot galvanized alloy substrate, "ZA" on behalf of galvanized aluminum alloy substrate, "ZE" on behalf of galvanized substrates. Caitu specifications | Tonghua caitu | Jinhong Run steel provided by Boxing Xingfu Town 金宏润 Steel Industry and Trade Ministry. Boxing Xingfu Town 金宏润 Steel Industry and Trade Ministry (www.bxjhr.com) (www.bxjhr.com) strong, credible, Shandong Binzhou board (with) wood industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Jinhong Run steel and you hand into the brilliant, for a better future!