Roof Traffic

The designer must consider the degree and type of foot traffic that may be expected on a roof. The following requirements are subjective standards and must be considered in line with customer expectations, and building use and type.

More robust design than specified below (reducing purlin spacing or adding protection from mechanical action), is required for roofs that are regularly accessed, roofs used as staging by subsequent trades, or areas that are adjacent to access points, particularly step down access.

Type A – Unrestricted Access

Type A are roofs:
  • that need to be regularly traversed by the roofer for access during installation;
  • that will be accessed regularly by sub-trades;
  • that butt on to walls or windows that may require maintenance;
  • that have plant, chimneys, or solar installations requiring regular maintenance; or
  • that require regular access for clearing gutters or spouting of debris.
For Type A roofs, the cladding must resist the load of 1.1 kN applied to the pan or a single rib, and a strength load of 2 kPa applied to the weakest point.

Type B – Restricted Access

Type B are roofs:
  • that are simple in design and do not have to be regularly traversed by the installer;
  • which are infrequently accessed by qualified trades people for maintenance; or
  • with a pitch of more than 35°.
For Type B, roofs the cladding must resist the load of 1.1 kN applied to the pan or over two ribs and a 2 kPa load applied to the weakest point.


Type C – Non-Trafficable

Type C are roofs:
  • where supports are required to be laid to support roof traffic, or traffic should take place within 300 mm of purlin lines,
  • which have a pitch of 60° or greater; and
  • including non-trafficable translucent roof sheeting.
For Type C roofs, the cladding must resist the minimum load of 0.5 kN applied to the pan or over two ribs.
Clause Number: 
Revision Category: 
3 - Substantial change to recommendation
Revision Detail: 

The content of this has been edited to include a load of 2 kPa applied for accessible roofs.

Draft Clause: