Part 1: Architect’s Guide 1 - 55 Table 6.6 Protection and thickness of coating Conditions of use Traditional anti-rust coating Coated steel products Elements incorporated in floors and façades, protected in absence of humidity 1 or 2 primer layers of anti-rust paint, 40 to 50 microns thick Lacquered and painted products: 15-20 microns thick Elements inside buildings without constant humidity 1 primer of anti-rust paint, 1 paint finish, 60 to80 microns thick Lacquered and painted products. 1 paint finish. 60 microns thick Elements inside unheated buildings or where humidity is high 2 primers of anti-rust paint. 1 intermediate layer of paint, 1 finish of paint, 80 to120 microns thick Lacquered and painted products: 1 to 2 finishes of paint 80 to100 microns thick or Galvanized or pre-lacquered products Elements in contact with aggressive external atmosphere, humid climate, urban or industrial regions 2 primer layers of anti-rust paint, 1 intermediary layer of antirust paint, 1 finish of anti-rust paint, 120 to 200 microns thick Lacquered and painted products + 2 finishes of paint 100-120 microns thick Or: Galvanized or prelacquered products Elements in contact with marine environment 2 primers of anti-rust paint or galvanizing/metalizing with 1 layer of zinc 1 intermediary layer of antirust paint, 1 paint finish, more than 150 microns thick Lacquered or painted products + 2 layers of paint with high content of zinc or Galvanizing or metalizing + paint with high content of zinc Or: Pre-lacquered products The steel elements are usually delivered to site with a surface coating consisting of an anti-rust primer. Once the elements are installed, it is necessary to touch up any coating which has deteriorated during assembly. Although elements embedded in concrete are generally not painted, those parts which are not fully covered by concrete are often prone to corrosion and must be carefully protected (including column ends). For those parts of the elements concerned, the welds are performed and checked before applying surface protection. The welding procedure must be adapted for pre-painted products. Estimated life of paint protection: 8 to 10 years to first maintenance
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