ABCB Housing Provisions


Part 7.3 Roof tiles and shingles

Part 7.3 Roof tiles and shingles

(1) Part 7.3 applies subject to the limitations set out in H1D7.

(2) Part 7.3 need not be complied with if H1D7(3)(a) or (b) are complied with.

Explanatory information: Design wind speeds

Information on design wind speeds for particular areas may be available from the appropriate authority. Also see the table associated with the definition of ‘design wind speed’ for wind classes. A map indicating wind regions of Australia is contained in Part 2.2.

Explanatory information: Other relevant roof tile requirements

In addition to the requirements of this Part, requirements for roof tiles also exist in NCC Volume Two and other Parts of the ABCB Housing Provisions. They include the following:

  • For the sizing and fixing of roof battens - NCC Volume Two H1D6(3) (steel battens) and H1D6(4) (timber battens).
  • For sheet roofing over a separating wall - ABCB Housing Provisions Part 9.3.
  • For gutters and downpipes - ABCB Housing Provisions Part 7.4.

(1) Roof tiles and hip, ridge, barge and capping tiles must be fixed in accordance with Table 7.3.2 and Figure 7.3.2a, Figure 7.3.2b, Figure 7.3.2c, Figure 7.3.2d and Figure 7.3.2e.

(2) Fixing required by Table 7.3.2 must consist of one or a combination of the following:

  1. Galvanized clout nails with a minimum diameter of 2.8 mm and of a length so that the nail will penetrate not less than 15 mm into the batten.
  2. Self embedding head screws of 8-18 gauge and of a length so that the screw will penetrate not less than 15 mm into the batten.
  3. Purpose made clips of non-ferrous metal, stainless steel or steel protected from corrosion in accordance with Tables 7.2.2b, 7.2.2c and 7.2.2d.
  4. Flexible pointing material complying with AS 2050.
Table 7.3.2 Minimum fixing requirements
Wind class Tile fixing - edge of roof Tile fixing - field of roof Ridge, hip, barge and valley tiles including capping (see Figure 7.3.2d and 7.3.2e)
N1 and N2 Fix every full tile in second course in from the edge of roof. In field of roof fix every second tile in every course, or every tile in each alternative course. (see Figure 7.3.2b) Fix each tile
N3 Fix each full tile in every second course starting from the second course in (see Figure 7.3.2c) Fix every second full tile in every course (see Figure 7.3.2c) Fix each tile
Table Notes

Refer to Figure 7.3.2a for determination of ‘edge of roof’ and ‘field of roof’.

Figure 7.3.2a Fixing of tile requirements — Identification of field and edge of roof
Figure 7.3.2b Fixing of tile requirements — Minimum tile fixing requirements - Wind class N1/N2
Figure 7.3.2c Fixing of tile requirements — Minimum tile fixing requirements N3
Figure 7.3.2d Fixing of ridge capping — ridge clip fixing
Figure 7.3.2e Fixing of hip capping — clout or screw fixing

Explanatory information

For the purposes of Figures 7.3.2a, 7.3.2b and 7.3.2c, ‘edge of roof’ is a 1.2 m wide band bounded by the eaves, hips and barge measured toward the ‘ridge of roof’.

(1) Flashing for roof tiles must comply with (2) to (7).

(2) Wall and step flashings:

  1. For masonry or similar walls, flashing must—
    1. follow the roof line, allowing not less than 75 mm upturn to the wall and a minimum of 150 mm in width and moulded into the tiles; and
    2. have a horizontal overflashing, stepped overflashing or raked overflashing built into the masonry leaf or veneer, except that one continuous flashing may be used as both an apron flashing or an overflashing; and
    3. have joints overlap the one below by not less than 75 mm in the direction of flow.
  2. For flashing where the upturn can be fixed to or behind the supporting frame or cladding, it must—
    1. follow the roof line, allowing not less than 75 mm upturn to the wall and a minimum of 150 mm in width and moulded into the tiles; and
    2. be fastened into or behind the wall cladding at each end and at a maximum of 600 mm centres; and
    3. have joints overlap the one below by not less than 75 mm in the direction of flow.

(3) Flashing of penetrations must—

  1. be either collar, apron or other purpose made flashings; and
  2. have a minimum upturn on the penetration of not less than 75 mm and a minimum of 150 mm in width surrounding the penetration and be moulded into the tiles; and
  3. permit the total drainage of the area above the penetration.

(4) Joints in flashing must be not less than 75 mm and lapped in the direction of fall of the roof.

(5) Fixings for flashings must be compatible with the flashing material.

(6) Lead flashings must not be used on any roof that is part of a drinking water catchment area.

(7) Acceptable flashing configurations, including typical details for standard, and bedded and pointed valleys, are shown in Figures 7.3.3a, 7.3.3b, 7.3.3c, 7.3.3d, 7.3.3e, 7.3.3f and 7.3.3g.

Figure 7.3.3a Flashing abutting a masonry wall
Figure 7.3.3b Flashing abutting a weatherboard wall or similar cladding
Figure 7.3.3c Stepped flashing to a masonry wall
Figure 7.3.3d Pipe penetration flashing
Figure 7.3.3e Chimney flashing
Figure 7.3.3f Standard valley
Figure 7.3.3g Bedded and pointed valley for high rainfall areas (refer definition of low rainfall intensity area)

Sarking must—

  1. be provided in accordance with Table 7.3.4; and
  2. comply with AS 4200.1 and be installed with—
    1. each adjoining sheet or roll being—
      1. overlapped not less than 150 mm; or
      2. taped together; and
    2. sarking fixed to supporting members at not more than 300 mm centres; and
    3. no sags more than 40 mm in the sarking.
Table 7.3.4 Sarking requirements for tiled roofs
Roof pitch Maximum rafter/truss top chord length without sarking (mm) Note 1
<18° N/A Note 2
≥18° <20° 4 500
≥20° <22° 5 500
≥22° 6 000
Table Notes
  1. The maximum rafter/truss top chord length is measured from the topmost point of the rafter/truss i.e. the apex downwards. Where the maximum length is exceeded, sarking must be installed over the remainder of the rafter/truss top chord length towards the eave line of the roof, or equivalent where the building has no eaves.
  2. All tiled roofs with a pitch less than 18 degrees must be provided with sarking, regardless of rafter/truss chord length.

Explanatory information

Where sarking is also provided as reflective insulation for the purpose of energy efficiency, Section 13 of the ABCB Housing Provisions contains required R-Values and the necessary airspaces adjoining the reflective insulation.

(1) An anti-ponding device/board must be provided where sarking is installed on—

  1. roofs with a pitch less than 20°; and
  2. roofs with no eaves overhang, regardless of the roof pitch.

(2) An anti-ponding device required by (1) must be water resistant and fixed along the eaves line from the top of the fascia back up the rafter with a clearance of approximately 50 mm below the first batten (See Figure 7.3.5).

Figure 7.3.5 Typical installation of anti-ponding device/board
Figure Notes
  1. Sarking is required by 7.3.4.
  2. Anti-ponding device is required by 7.3.5.

Where an eaves gutter is provided in accordance with H2D6(1), tiles must overhang the fascia or tiling batten by not less than 35 mm (See Figure 7.3.5).