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EPAMS Siphonic System

Soil, drain & rainwater

EPAMS Siphonic System

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Architectural design and roof sizes of certain modern buildings can often make the installation of conventional rainwater drainage a difficult task, and with increasing rainfall intensity the need to evacuate rainwater from the roof at higher speeds is becoming more important.
The EPAMS cast iron rainwater system from Saint-Gobain PAM UK provides the perfect siphonic solution, as it requires fewer vertical stacks and can use smaller diameter outlets and pipework horizontally that can run parallel to roof saving on installation and space.
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Technical Details

  • Steel Siphonic outlets in 50, 75, 100 and 125mm Diameters for various roof type applications.
  • Cast Iron pipework to BS EN 877 in diameters 50mm to 600mm.
  • Coatings
    • Pipes:
      • Externally coated with an acrylic, anti-corrosive red primer - average dry thickness 40 microns.
      • Internally - two-part epoxy lining, ochre in color - average thickness 130 microns.
    • Fittings:
      • Internally and externally red epoxy coated.
  • Stainless steel mechanical couplings supported by a range of grip collars.
  • Capable of withstanding -0.9 bar negative pressure
  • Saint-Gobain PAM Technical department provide a full siphonic system design.
    Please note - any changes on site involve total re-calculation of the system design and cannot be made without prior agreement.

Key Features & Benefits

  • Gradient free installation, requiring less roof space
  • Reduced diameter of pipework
  • Fewer vertical stacks
  • All benefits of cast iron, fire resistance, acoustic performance, strength, and long life
  • Requires no expansion control

Standards & Approvals

  • BBA Certified 06/4328
  • Member of SRDA (Syphonic Roof Drainage Association)
  • Designs in accordance with BS 8490: 2007 BSI design guide to siphonic drainage
  • Fire Rating: A1


Technical Enquiries: 
+44 (0) 1952 262 529
Customer Services:
+44 (0)115 930 5000



epams syphonic system
Siphonic system
Cast iron syphonic system
epams illustration
Epams Illustration


EPAMS principle of siphonic drainage
The EPAMS range is the ideal choice for syphonic rainwater drainage, with its strong, high capacity outlets and the peace of mind of cast iron pipes and fittings. EPAMS products are non-combustible, quieter than other materials, have a longer life expectancy and a mechanical resistance allowing them to easily withstand both positive and negative pressures. Saint-Gobain PAM UK is a member of the Syphonic Rainwater Drainage Association (SRDA).
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See also

Saint-Gobain PAM UK specialises in the manufacture of cast iron above and below ground drainage s

Cast iron drainage systems to suit most gravity above ground applications for commercial, residential and public buildings all backed by third party certification.