Standard

SA HB 39

Published

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Abstract

This Handbook provides information and basic guidelines on the selection, performance and installation of metal roofing and wall cladding. Although the fixing details for roof drainage systems relate mainly to steel, acknowledgment is made of the other materials in common use such as profiled fibreglass reinforced polyester (FRP) and polycarbonate. When utilised, the design and installation measures contained in this Handbook will provide a weatherproof exterior and ensure that all rainwater is directed to the stormwater drainage system. The recommendations and best practice methods set out in this Handbook will ensure that— (a) the life of the roof sheeting, flashings and roof drainage systems including accessories, is optimised; (b) the installation of roof coverings and flashings are weathertight; (c) the installation of the roof drainage system is capable of discharging established rainfall intensities; (d) in the event of a blockage or partial blockage of the stormwater system or downpipes rainfall is discharged external to the building with no detrimental effect to the building or its contents; (e) the end effect of poor transportation, handling and storage is recognised and avoided; (f) safe work practices are observed, with full awareness of solar radiation effects on exposed skin and sun glare on eyesight; (g) the selection of materials reflects local environmental factors; (h) the correct types of fasteners and recommended fixing patterns are utilised; (i) the minimum and effective roof pitch recommendations for each profile are met; (j) the minimum and effective grade for roof drainage systems is met; (k) provision is made for expansion in roof coverings, gutters, flashings and downpipes; (l) roof noise is minimised; and (m) insulation is installed to ensure effective performance. As the bulk of this Handbook refers to roofing, it is recommended that the user also source any appropriate additional information required for metal wall cladding installations from specific product manufacturers. NOTE: The general design and sizing principles of roof drainage systems may also be utilised when installing drainage outlets, downpipes and overflow provision in above-ground external areas of buildings such as drains from balconies, patios and the like.

Document information

  • Standard from SA_AC
  • Published:
  • Version: 0
  • Document type: IS
  • Additional information
    • Third Edition; Incorporates Amendment No 1: 7/2021