A highly automated hot dip process in conjunction with controlled temperature is employed to process the galvanized steel. In order to produce a galvanized steel with excellent resistance to corrosion, rust-free and devoid of any galvanizing defects zinc and antimony etc. of highest purity are applied with proper pre treatment of the substrate and controlled process of galvanizing. To further enhance the quality of sheet and make it white rust proof a special chemical treatment is applied on the zinc coated surface.
TYPES
THESE SHEETS ARE AVAILABLE IN TWO TYPES-
PLAIN GI SHEETS.
SIZES AVAILABLE ARE-
8’ X 3’
8’ X 4’
GAUGE-
30 , 28 , 26 , 24
CORRUGATED GI SHEETS-
SIZES AVAILABLE ARE-
27’’ , 30’’ WIDTH
8’ , 10’ , 12’ LENGTHS
USES
IT IS MOSTLY USED IN TEMPERORY STRUCTURES LIKE CONTRACTORS CABIN ON SITE, SHEDS. MANDAPS SMALL ROADSIDE SHOPS ETC…
IT IS ALSO COMMONLY USED IN INDUSTRIES.
ALSO COMMONLY USED IN VILLAGES FOR HOUSES.
USED IN MAKING TANKS.
USED FOR PARTITIONS
WAS ALSO USED IN MANUFACTURE OF PLANES..
CONSTRUCTION
Corrugations should run in a straight line between the highest and lowest points, and at a right angle to the purlins (the intermediate supports).
The overlaps (ends and sides) depends upon the sloop of the roof .
Purlin spacing should suit the end laps required for the size of sheet to be used.
Sheets should be laid so that the side overlaps are directed away from the prevailing wind.
All purlins should be in one plane and parallel to each other. They should be properly anchored to the supporting superstructure.
Ends of all sheets should be supported by purlins. The free overhang at the eaves should not exceed 300 mm.
8 mm diameter (min) hook bolts, crank bolts or coach screws, should be inserted through 10 mm diameter drilled holes.- NEVER PUNCHED - in the crown of the corrugations
THE FIXING OF THE GI SHEETS IS DONE BY J BOLTS.
A 8-10 MM DIA HOLE IS DRILLED THROUGH THE CROWN OF THE CORRUGATIONS.
THIS HOLE IS ON THE OVERLAP OF 2 SHEETS.
IT SHOULD BE DRILLED ON THE CROWN SO AS NO WATER SEEPS IN
THEY CAN ALSO DIRECTTLY BE BOLTED ON THE PURLINS..
ADVANTAGES
LIGHT IN WEIGHT.
EASY TO HANDLE.
NO SKILLED LABOUR REQUIRED.
WATER RESISTANT.
CAN BE PAINTED.
NO BREAKAGE.
DISADVANTAGES
HEATS UP QUICKLY AND MORE OFTEN.
DOES NOT HAVE MUCH LOAD CARRYING CAPACITY OVER IT.
ASTHETICALLY NOT APEALING.
RUSTS IF NOT MAINTAINED PROPERLY
WATER MAY LEAK THROUGH THE GI SHEETS AT THE CORRODED ENDS IF NOT MAINTAINED PROPERLY..
VERY NOISY ESPECIALLY DURING MONSOONS.
MANUFACTURERS
JINDAL
UTTAM
SIFTA
NIPON
TATA
MARKET SURVEY
GENERALLY THE SHEETS ARE RATED ACCORDING TO THE GAUGE OF THE SHEETS-
FOR CORRUGATED SHEETS..
GAUGE RATE
24 40 RS\SHEET
26 3ORS\SHEET
28 26RS\SHEET
30 23RS\SHEET
FOR TATA CORRUGATED SHEETS-
24 52RS\SHEET
26 40RS\SHEET
28 30RS\SHEET
FOR PLAIN SHEETS-
24 17RS\SHEET
26 14RS\SHEET
28 12RS\SHEET
30 10RS\SHEET
