Why is LYSAGHT FLATDEK® screwed in the pans?

LYSAGHT FLATDEK® is screw fixed in the pans as a screw through the ribs will damage the rib at the sides and result in holes for water to enter.

 
BlueScope Steel Limited
ABN 16 000 011 058
BlueScope is a trademark
of BlueScope Steel Limited
Australian Made BlueScope Lysaght