This standard provides general requirements for the design and installation of water supply and drainage systems in buildings. It covers materials, pipe sizing using the fixture unit method, water storage, system layout, traps, venting, and testing to ensure a hygienic and efficient plumbing network. This code works in conjunction with IS 1172 and the National Building Code.
Lays down general requirements for materials, workmanship, testing, and maintenance of water supply and drainage systems in buildings.
Quick Reference Values
Minimum trap seal depth50 mm
Minimum soil pipe diameter for WC100 mm
Minimum recommended slope for 100 mm drain1 in 40
Water supply pipe test pressure1.5 times the maximum working pressure
Minimum height of vent pipe above roof0.3 m
Practical Notes
This standard is now largely superseded by the National Building Code (NBC) of India 2016, Part 9 'Plumbing Services', which offers more comprehensive and updated guidelines. It should be used as the primary reference.
Correctly calculating fixture units (Loading Units) from Table 1 is critical for accurately sizing both supply and drainage pipes.
Ensuring every fixture has a water-seal trap with adequate seal depth (min. 50 mm) and that the system is properly ventilated is crucial to prevent foul gases from entering occupied spaces.