AS NZS 4994.1:2009 pdf free download – Temporary edge protection
3.6.2 Rails
Rails shall comply with the following:
(a) For all flat surfaces and roof slopes of not more than 10° from the horizontal, the top rail of the edge protection shall be located at an effective height above the surface of not less than 900 mm.
(b) For roof slopes of greater than 10° but not greater than 35° from the horizontal, the top rail shall be located at an effective height of not less than 900 mm above the point where a person could stand inside and adjacent to the edge protection on the sloping roof. This shall be not less than 300 mm from the back of the fascia, or outer edge of the truss or rafter where there is no fascia (see Figure 3.1).
(c) Where midrails are used, the nominal clear distance between rails shall not exceed 450 mm. The nominal clear distance between a midrail and a toeboard or bottom rail shall not exceed 275 mm.
(d) Rails intersecting at corners of edge protection shall be securely connected to each other or to a post. The connection shall be one rail immediately above the other.
(e) In any section of roof edge protection, the rails shall be nominally parallel.
(f) For roof edge protection that has the edge protection outside the roof line, the nominal clear distance between the bottom rail and the top of the fascia, or outer edge of the truss or rafter where there is no fascia, shall be not less than 150 mm and not greater than 275 mm (see Figure 3.1).
(g) For roof edge protection that has the edge protection outside the roof line, the nominal horizontal distance between the bottom rail and the nearest edge, including the gutter line, shall not exceed 100 mm (see Figures 3.1, 3.4 and 3.5). (h) For roof edge protection that has posts projecting through the roof cladding, the following requirements apply:
(i) The nominal clear distance between the bottom rail and the top of the roof cladding shall be not less than 150 mm and not greater than 275 mm, measured at 90° to the roof surface from the underside of the rail. These distances may be exceeded when non-structural panels backed by these rails are used, provided the gap between the bottom edges of the panels does not exceed these dimensions.
(ii) The distance between the outer edge of the post and the fascia, or outer edge of the truss or rafter where there is no fascia, shall be not greater than 300 mm measured horizontally (see Figure 3.3).
3.6.3 Toeboards
Where used, toeboards shall be not less than 150 mm high and shall have sufficient strength and rigidity to prevent a person from passing the toeboard, and shall be securely connected at corners. The clear distance between the toeboard and the top of a floor slab shall be not greater than 10 mm. The clear distance between the toeboard and the top of the roof cladding shall be not greater than for a bottom rail, unless the toeboard is required to prevent materials from falling from the roof, in which case the distance from the underside of the toeboard and the top of the roof cladding shall not exceed 10 mm. A roof having a slope greater than 26° shall be fitted, at the lowest edge of the slope, with an infill panel protecting the lowest 500 mm of the barrier, except that infill panels are not required where the barrier is installed within 1.8 m of a roof hip (see Figure 3.2). A midrail and bottom rail or toeboard, as appropriate, are also required in these areas.