How many sheets and screws do I need?

Fasteners hold your sheets to your battens.

How many screws do I need?

To find out the number of screws required to fix your roofing sheets to your battens, follow these simple instructions.

Fasteners hold your sheets to your battens.

  1. Calculate the total Lineal Metres (LM) of your roof sheets by multiplying quantity by sheet length ordered. To calculate sheet length and quantity, click here.
  2. Next calculate the Square Metres (Sqr.M) of your roof by multiplying LM by the coverage area. The coverage area for corrugated iron is 0.762m as denoted by the 762 in the product name.
  3. Finally, multiply the Sqr.M by 7 to find the number of screws needed.
  4. Round this number up to the nearest box of 100. It’s always good to have 5-10% spare. I.e. If you need 520 screws, you should order 600, but if you need 590, it might be wise to order 700.

Example:  You measure your roof and calculate the sheet length and quantity required are 3m and 7 sheets respectively. Your LM will be 3 x 7 = 21LM.  21 x 0.762(coverage) = 16.002Sqr.M.  16.002 x 7 = 112.014 screws required. Round 112 up to 200. You will need 2 boxes. 

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