Point Load

Most roofing profiles will resist far greater point loads when the load is applied to the pan of the profile rather than the rib. When the load is applied to the pan, the load is shared by the adjacent ribs and is applied to the flange under tension, rather than the flange under compression.

Testing loads may be applied to the pan or the rib depending of the profile shape and the design criteria. See Roof Traffic.

Roofs that may be accessed by foot traffic must be designed to withstand a point load which is representative of a worker with a bag of tools. It is calculated at 112 kg, which equals 1.1 kN force.

In the case of a superimposed load, such as an air conditioning unit which is supported directly by the roof cladding, the unit weight per support and area of contact is calculated to arrive at point loads.

A point load on a roof is always positive or downward (+).


Revision Category: 
1 - Minor Errata
Revision Detail: 

Clause revised for gender neutrality. No significant changes.

Draft Clause: