Fixing Procedure Charminar Corrugated Newkor Roofing Sheets



Fig.7
  1. For fixing left to right start with sheet 'A' (Fig.7).
  2. The first sheet is laid at the eaves, square to the purlin with downward corrugation on left hand and upward corrugation on
    right hand, to be covered by the downward corrugation of next sheet.
  3. Determine the overhang at eaves and verge.
  4. Next, fix sheet 'B' which is mitred at the bottom right hand corner
    on the under lap (Fig.8).
  5. The sheets are supplied with square corners to ensure that only three thicknesses occur at the point. Where four sheets meet it
    is necessary to cut or mitre the appropriate corner of the sheet.
    (For size of mitre please refer Fig.9)

  1. All other sheets in this tier are fixed similarly including the ridge sheet 'C'. These sheets should be in a straight line. Start the next tier with sheet 'D' which is mitred at the top left hand on the cover lap.


Fig.8


Fig.9

Fig.10. Details of Side lap Joint

  1. Make sure that side lap is correct and the eaves line straight. Continue with sheet 'E' which is mitred at the top left hand corner on the cover lap and the bottom right hand corner on the under lap. Finish the tier with ridge sheet 'F' which is mitred on the bottom right hand corner only.
  1. Don't straighten a tier by decreasing the side lap. The last tier of a roof consists of eaves sheet 'G' and intermediate sheet 'H' which are mitred on the top left hand corner (cover lap) and ridge sheet 'I' which fis not mitred.
  2. The bolts should pass through the second and last corrugations.
  3. Drilling on sheets must be done atleast 75 mm away from edge of sheet.
  4. Bolts and Nuts should be hand-tightened only.

Fig.11. Details of End laps Joint
Minimum End laps are 150 mm. But in exposed positions and in case of flat roofs. End laps are increased.
The same procedure is applied if the sheets are required to be laid right to left. The plan of mitring shown in Fig.8 is to be reversed. The rest of the procedure is the same.