GSO BS 8490:2026
BS 8490:2025
Gulf Standard
Current Edition
·
Approved on
17 September 2026
Siphonic roof drainage systems - Guide
GSO BS 8490:2026 Files
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GSO BS 8490:2026 Scope
This British Standard provides guidance and recommendations for roof drainage systems using
circular-section pipes that operate under siphonic action, including:
a) design parameters;
b) installation;
c) verification; and
d) maintenance needs of siphonic roof drainage systems conforming to the performance
requirements in BS EN 12056‑3:2000, 6.2.
Guidance is also given on carrying out testing of outlets and checks of designs, for the use of specifiers
and regulatory authorities.
Recommendations for site drainage systems that receive flows from siphonic roof drainage systems
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