Standard No.SS 525 : 2006
TitleCode of practice for drainage of roofs
No. of Pages72
ICS Classification91.140.80 Drainage systems
91.060.20 Roofs
Comments(Formerly CP 26 : 1983)
SynopsisDeals with the drainage of rainwater from roofs (including external walls) and recommends methods of designing gutters, gutter outlets and rainwater downpipes. It includes calculation of catchment areas and the required flow rate. Performance requirements for siphonic roof drainage are also outlined.

In addition, the code gives guidance on the choice of materials in connection with fixing and jointing the drainage systems. It also covers the inspection, testing and maintenance requirements. Guidelines on the design of gutters for the prevention of mosquito breeding are also included.
CommitteeBuilding and Construction Standards Committee
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AmendmentAmendment No. 1, Aug 2007    Download as PDF
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