Roof Drainage Solutions

Specially designed high flow siphonic roof drain eliminates air ingress to promote speedy priming.

  • Pipes run horizontally within building envelope
  • Reduces underground drainage requirements
  • Up to 45% cost saving overall
  • Exceptionally accurate design software
  • Easy routing of rainwater from roof to desired discharge location, making system an ideal partner for rainwater harvesting

Terrain HydroMax

Terrain HydroMax provides an advanced Siphonic Roof Drainage solution offering full compliance with BS 8490:2007 using TERRAIN FUZE BBA-certified pipes and fittings. Terrain’s self-cleaning, high-velocity flow HydroMax siphonic roof drainage system offers a quick and efficient way to remove large volumes of rainwater from roofs in a controlled manner.

Designed to accommodate recent changes in storm patterns, as stipulated in bS EN 12056-3:2000 it uses siphonic principles to ‘suck’ the rainwater from the roof into small diameter pipes, creating a flow capacity up to ten times greater than that of an equivalent gravity-fed system.

Key benefits
  • Captive seals in all gutter systems
  • Combination clipping system for quick reliable installation
  • Fixing locations positioned outside the wet areas
  • Expansion markings on ALL gutter fixings
  • Dry jointed spigot-socket downpipe system
  • Complies to EN607/EN12200/EN1462

Polypipe Terrain

Polypipe Terrain provides a comprehensive portfolio of drainage products and systems that are appropriate for a wide and varied range of commercial, industrial, housing, and public sector applications, enabling the integration of an all-round drainage solution from a single specialist manufacturer.

Our unique approach to research and development consistently produces innovative new products that satisfy customer requirements. These are reflected across every area of Polypipe Terrain’s range – from the new Terrain Acoustic dB 12 acoustically insulated soil and waste products through to the Terrain FUZE drainage system which is ideal for non-pressure above ground applications. Each product bears the Polypipe Terrain hallmarks of high-quality construction and reliability in use and all are backed by the company’s outstanding technical advice and customer support service.


Terrain Soil and Waste Products

Having pioneered the development of solvent-welded systems, Terrain soil and waste products represent the industry benchmark for quality, installation flexibility, and product innovation backed by the highest levels of customer service. Terrain systems include an extensive range of soil and waste drainage products for commercial, industrial, housing, and public sector developments, all built on the strength of our Terrain brand.

Systems include solvent-welded and push-fit options for both soil and waste drainage; overflow and trap systems; and a comprehensive range of adaptors and accessories. Products are available in a range of colours.


  • Industry leading range of solvent and push-fit soil and waste solutions.
  • Unique producst offer unrivalled installation options.
  • High quality finish colour matched to Terrain rainwater systems.
  • Suitable for commercial and domestic installations.

Terrain FUZE

A modern high-density polyethylene system with many advantages over cast iron and other traditional systems. Terrain FUZE is a top-to-bottom solution for all above-ground drainage and many chemical waste applications. It allows specifiers and installers to benefit by providing them maximum flexibility in the design process.

Utilising the intrinsic properties of high-density polyethylene, Terrain FUZE offers greater benefits above and beyond more traditional materials and performs significantly better when tested for impact and abrasion resistance, chemical corrosion and extreme temperatures. The lightweight nature of Terrain FUZE allows the product to be installed quickly and efficiently, giving direct, resource-saving benefits to specifiers and installers.

HDPE offers exceptional performance above and beyond traditional pipe materials including:

  • Versatile application
  • Highly resistant to impact even at low temperatures
  • Highly resistant to chemical agents
  • Corrosion resistant
  • Abrasion resistant
  • Lightweight and easy to install
  • Ideal for pre-fabrication
  • Suitable for use with Terrain HydroMaxTM Siphonic System

Terrain Acoustic dB12

Acoustic drainage system with superior performance
We all know how much noise water can make when it travels through a building and how intrusive this sound can be. In endeavouring to meet sound controls within Building Regulations, additional materials and labour are required, increasing the cost and time on site. Terrain Acoustic dBl2 is a complete acoustic drainage system designed to reduce the effect of noise.

Terrain Acoustic dB12 multilayer drainage pipe with acoustic fittings creates a high quality durable and reliable system developed specifically to meet construction requirements for increased level of soundproofing, and ideally suitable for: Mixed development, Hospitals, Hotels, Schools, Commercial applications.

Advanced technology and performance
Terrain Acoustic dB12 has been specifically developed for acoustic soil applications, with four sizes of pipe from 40mm – 160mm and a comprehensive range of fittings to provide complete solution for acoustic amnagement of soil pipes.

Terrain Acoustic db12 multilayer pipe and acoustic fittings have been tested to the most recent European accreditations for airborne and impact noise, at the highly respected Fraunhofer Institute in Stuttgart.


For Enquiries, get in touch with us.

For more enquires and technical Support Please call +234 803 3242 821