Water Management Overview

  • Nature of Business

    • Premium waterproofing solutions for flat roofs – including green roofs, blu-roofs and roofing support services
    • Solutions that manage and attenuate water originating inside and outside buildings
    • Integrated “Rain to Drain” solutions for the built environment
  • Growth drivers

    • Legislation aimed at conservation, attenuation and control of water
    • Structural engineering specifications
    • Building regulations
    • Specifications
  • Opportunities and potential

    • Outperformance of the UK construction market through continued market share gain and introduction of new products and systems
    • Specification-led cross-selling of a ’building envelope’ of Alumasc exterior building product including solar shading/screening systems, balconies & balustrades and water management
    • “Rain to Drain” synergies following the acquisition of Wade
    • Increase divisional export sales with focus on systems using Gatic, Harmer and Wade products
    • Grow operating margins through new product introductions, operational efficiency and gearing
  • Stage of construction cycle

    • Mid-cycle
    • Mainly outsourced to suppliers in Europe and North America and other Alumasc group companies
  • Routes to market

    • Architectural specification, sales to main contractors via a network of registered installing sub-contractors
    • Majority of sales are specification/ contract led
    • Most are sold via building distributors
    • Some are sold direct via civil drainage contractors
  • Market position

    • Roofing specifications – UK no. 2
    • Alumasc Rainwater: No. 1 in UK aluminium and No. 2 in cast iron
    • Harmer & Wade building drainage: No. 1 in metal building drainage systems
    • Gatic: No. 1 in UK engineered access covers and No. 1 in UK high capacity drainage
  • Operations and supply chain

    • Majority UK in-house manufacture

Case Study


Elephant and Castle, London – Green Roof System and Waterproofing

Key Features

Blackdown Green Roof
Blackdown supplied green and brown roofing to help local ecosystems and provide a natural finish with the surrounding area.

Hydrotech Structural Waterproofing
With zero product failures in over 50 years worldwide, Hydrotech was installed beneath the green roof to provide a seamless hot melt waterproofing membrane solution.