Quick Reference Values
standard full flush volume6 Litres
standard half flush volume3 Litres
minimum water seal depth50 mm
general tolerance for dimensions above 75mm± 5%
standard height of floor mounted WC bowl390 mm to 400 mm
Practical Notes
Trap seal depth must be carefully checked on site (minimum 50 mm) to prevent the ingress of foul odors from the drainage system.
Wall-hung WCs require compatible concealed cisterns and sturdy mounting frames (chair brackets) capable of withstanding point loads (usually tested to 400 kg as per Part 1).
Always verify the S-trap or P-trap outlet diameter and orientation before casting slabs or core cutting to ensure proper alignment with soil pipes.