There are wide types of materials that can be utilized for use as roofing sheeting in various contexts. steel sheet that has been coated with a protective layer of zinc to ward off exposure to the elements and moisture intrusion is known as galvanized steel. One or both sides of the steel sheets can receive this protective coating. The extent to which the galvanized steel sheet will be used, as well as the anticipated level of environmental humidity, may affect the protective coating's thickness.
- Galvanizing Techniques
The galvanic method uses an electrolyte solution to apply zinc to a metal surface. A metal (often iron or steel) is coated with a zinc layer by being submerged in a bath of molten zinc at a temperature of around 460°C during the galvanizing process. Low-temperature galvanizing involves applying a particular mixture comprising zinc powder to a metal surface. Sherardization is a galvanizing technique that uses either zinc powder (which is processed at high temperatures between 300 and 450°C) or zinc vapor (which is processed at temperatures between 800-900°C). Zinc spraying is the process of employing a specialized technological pistol to pollinate metal with zinc. Gas-dynamic galvanizing involves using a supersonic jet stream to apply zinc coating.
- Classification
Galvanized product brands and size options are governed by international standards for technical specifications. The primary characteristics for categorizing galvanized sheets are: application domain (metal structure fabrication, cold forming, and profiling); the coating's chemical makeup (whether it is pure zinc or an alloy like zinc-iron, zinc-aluminum, aluminum-zinc, or zinc-magnesium, for example); The protective galvanized coating's thickness and weight. 
- Application
Galvanized steel sheet is used widely in various manufacturing sectors and industries because of its high tensile strength, simplicity of installation, long lifespan, and resistance to corrosion and harsh conditions. Due to its light weight, galvanized steel sheet is frequently used in roofing. Additionally, this substance forms the foundation for the manufacturing of additional roof and facade components, forced ventilation systems, ducts, gutters, and downspouts, as well as a variety of structural components and parts used in nearly every aspect of industrial and civil engineering construction. Additionally, profiled sheeting, metal tiles, and metal siding are frequently made using galvanized steel sheets. Galvanized steel sheets can also be used to build silos, short-term storage facilities, or agricultural silages. Practically speaking, galvanized steel sheet is utilized in literally every construction we see around us. Examples include ships, airports, train stations, billboards, cars, stairs, cornices, fences, and other metal buildings. Principal Benefits: Galvanized steel provides a number of benefits: extensive working window Ten years must be used at least. The originality of the metal combination. The zinc coating and a metal foundation work together flawlessly. The substance does not rupture, split off, exfoliate, or crack while being used. absolute sensitivity to the surroundings. Because zinc is a natural substance, it does not release any toxic substances. It is therefore usable in home settings. 
several uses. Installation and subsequent repair are simple. a pleasing appearance. Old galvanized sheets can be reused after being taken apart. When properly disassembled, galvanized sheet retains all of its original technical characteristics and properties. affordable cost Galvanized sheet is regarded as an economical building material.
- The steps involved in installing galvanized sheet roofing
- Galvanized Steel Sheet, first
The G.S roof cannot have a slope that is less than 1 vertical to 5 horizontal. One vertical to three horizontal is the typical pitch that should be used. The G.S sheets must be put out with two ridges or corrugations on each side and a minimum lap of 15 cm at the ends. Slopes of one vertical to two horizontal and steeper slopes shall be subject to the aforementioned minimum end lap of 15 cm. The smallest permitted end lap on slopes that are flatter must be 20 cm. A minimum lap of 20 cm must be measured perpendicular to the lines of the ridge, hip, and valley on sheets with those features. Before the G.S. sheets are fastened into position, the overlapping portions must be painted with two coats of approved paint that is appropriate for the G.S. sheet and a coat of acceptable steel primer. The G.S sheets must be fastened to the purlins or other roof components, such as hip or valley rafters, using 8 mm galvanized J or L hook bolts and nuts, bitumen, and G.I. limpet washers, or a limpet washer containing white lead. On every purlin, three minimum hook bolts must be installed, with a maximum separation of 30 cm, at the ridges of the corrugations in each sheet. 
Along each of the staggered rows, the seam bolt spacing must not be greater than 60 cm. While the sheets are on the ground, the holes for all bolts must be drilled, not punched, in the ridges of the corrugations.
- Hips and Ridges
The same 8 mm G. I. hook bolts, nuts, bitumen, and G. I. limpet washers must be used to fasten the ridges to the purlins.Similar 8 mm dia G.I bolts must be used to secure hips to purlins. At least one of the fixing bolts must go through the end laps of the ridges and hips on either side. Hip and ridge end laps must be linked together with galvanized iron seam bolts measuring 25 x 6 mm. Before they are set in place, G.I. sheets for the ridge and hip sections as well as the roofing sheets must be painted with a coat of primer and two coats of paint made for G.S. sheets.
- Valley and Flashing, third
With the 8 mm dia. G, fasten the flashing and valley sheets to the purlins and valley rafters. Bolts and its accessories are hooked. At least one of the bolts must go through the opposite side's valley pieces' end laps. With masonry, the free end of the flashing must be secured at least 5 cm inside with a 1:3 mortar mix (1 cement: 3 coarse sand).
- S. sheets under overlaps must have their surface coated with two coats of certified paint made for G. S. sheets after a coat of approved primer.
4.Gutter The gutter must be fixed to and supported by M.S. flat iron brackets that have been bent into the desired shape and fixed to the necessary slope. 
Brackets must be spaced apart by no more than 1.20 meters. These brackets must be 40 x 3 mm in section and bend to shape before being secured solidly to the sides of rafters with three No. 10 mm dia. bolts, nuts, and washers in the designated locations. The connecting bolts must be spaced at 12 cm intervals, and the brackets must overlap the rafter by at least 30 cm. With this configuration, the vertical section of the bracket's overhang from the face of the purlin shall not be greater than 22.5 cm. An appropriate drop end or funnel-shaped connecting piece constructed of G.S. sheet the same thickness as the gutter and reconnected to the gutter with the other end tying into the socket of the rain-water pipe is required for connection to downtake pipes.