Corrugate Profile

The corrugated profile has been used in New Zealand for over 150 years and there has been only one significant change during that period.

In the 1960s the steel grade used for roof and wall cladding changed from low-strength steel (250MPa or G250)  to high-strength steel (550 MPa or G550). The number of corrugations also changed from 8 to 10.5, which enabled the sheets to be laid either side up, as opposed to over-and-under.

The standard corrugation profile has 17.5 mm deep crests at 76 mm spacings, but smaller and deeper alternatives are also available.

Corrugate cladding is formed with a slightly asymmetrical overlap profile to a capillary barrier.