Roof Cladding Damage

Excessive downforce on a rib or corrugate crest can cause a compression fold, or “ding” in the apex of the crest.

Most roofs designed to Restricted Access criteria will incur some damage during installation or by subsequent traffic.  If this is unacceptable, roofs should be designed to Unrestricted Access criteria and roof access and usage by other trades must be strongly managed and supervised.

 A small ding in a sheet will not normally cause any structural problems and may be aesthetically acceptable, however deeper dings can cause cracking of the sheet and lead to leaks.

To restore a damaged rib load capability to the original levels  all damage must be repaired with a cap flashing.

For aesthetic reasons, any damage may be unacceptable. However, if the roof cladding is not visible, ribs can be repaired by using a sealed and riveted saddle cap.
It is technically acceptable to have two dings or creases on one sheet within one purlin spacing, providing two adjacent ribs are not damaged. Any greater level of damage requires the sheets to be replaced, and the person who causes the damage must report it and be responsible for its repair.


Clause Number: 
Revision Category: 
2 - Editing and rearrangement
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Drawing updated: Sealed and Riveted Saddle

Draft Clause: