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Alumasc Exterior Building Products Ltd


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01744 648400

  • Heritage rainwater systems
  • Heritage rainwater systems
  • Aluminium Rainwater Systems
  • Aluminium Rainwater Systems
  • Aluminium Rainwater Systems
  • Aluminium Rainwater Systems
  • Fascias, Soffits & Copings
  • Metal Roofing
  • Facades
  • Facades
  • Waterproofing
  • Waterproofing
  • Waterproofing
  • Green Roofing
  • Swisslab External Wall Insulation
  • Swisslab External Wall Insulation
  • Swisspan
  • Mineral renders

Alumasc Exterior Building Products Company Profile

Alumasc Exterior Building Products Ltd (AEBP) provides a unique fusion of premium products for building exteriors and drainage, backed up with high levels of technical expertise and project support, networks of approved installers and merchant stockists and a choice of warranty options. Highly regarded brands such as M.R., Harmer, Derbigum, Hydrotech, and Armaseam, together with Alumasc’s well known architectural rainwater range are leaders in their respective fields.

The company has been a major force in the UK construction industry for more than 30 years, generating an annual turnover in excess of £30 million. During that time Alumasc products and systems have been used on some of the most prestigious buildings in all sectors, throughout the UK and Europe.

Alumasc systems ensure a value-engineered approach, with quality of product specification and installation delivering a risk-free, zero defect solution for both new build and refurbishment applications. In many instances the products have been independently certified for a life in excess of 30 years or for the life of the building.

The product range includes:

Rainwater Systems

Alumasc is the market leading producer of BBA certified aluminium and cast iron rainwater systems. Suitable for modern, traditional and historical architecture, the range is available in a wide range of colours and styles and includes:

  • Polyester coated Heritage traditional aluminium gutters, Aqualine Secret-fix aluminium gutters, GX high capacity box section gutters and Apex standard and bespoke cast iron gutters.
  • Downpipes in Heritage traditional socketed aluminium, Flushjoint contemporary aluminium, Guardian security aluminium and Apex traditional cast iron, aluminium and cast iron hopper heads are also available.
  • Skyline aluminium integrated fascias, soffits and copings in bespoke designs and colours are also available to coordinate with or replace existing installations.

Drainage Systems

Alumasc has a renowned and extensive range of Harmer drainage products that are suitable for a wide variety of rainwater handling and building drainage applications. Products are ideal for use within retail, industry, hospitality, medical, residential and leisure sectors for roof drainage and internal drainage requirements.

The product range includes:

  • Roof outlets
  • Floor drains
  • Shower drains
  • Wet room drainage
  • SML soil and waste systems.


This unrivalled range of BBA certified flat roofing solutions is backed by on-site and office-based technical support, application by fully trained Alumasc registered contractors along with extended warranties and a post-project handover package and support service.

The portfolio includes Derbigum and Euroroof flat roof membranes, Hydrotech hot-melt waterproofing, Euroroof Caltech cold-applied liquid roofing, Firestone single ply roofing systems, Blackdown green roofs and a full range of complementary accessories.


External wall insulation and render systems manufacturer with a 25 year track record.

Alumasc is a leader in the design and development of thermally efficient solutions which utilise a choice of decorative polymer-modified, mineral and silicone renders along with traditional and acrylic brick slips.

External Wall Insulation (EWI) is the most effective way of insulating a building and can be installed as part of ECO funded or The Green Deal schemes.

Alumasc’s proven experience in refurbishment and new build projects along with its BBA certified systems, technical expertise and full warranty packages, ensures high performance External Wall Insulation systems are available for projects of any scale.

System options include:

  • External Wall Insulation Systems are available with a choice of insulating materials and render facings for all types of commercial and residential projects. Swistherm and Swisrail are suitable for new build applications and Swisslab and Swisspan are suitable for refurbishment applications.
  • Render Only Systems are for direct application to solid walls or used as part of an Alumasc EWl system. Silicone and mineral contemporary renders are also available with rolled or dragged surface textures and traditional polymer renders in plain, spar-dashed and brick effect finishes
  • Specialist Brick Slip Cladding Systems are designed to be used in conjunction with EWl systems for a real brick look
  • Decorative Silicone Facade and Masonry Paints are offered for the final finish in a wide variety of colour options

Green Roofs

Blackdown Green roofs, from Alumasc, offer many advantages for building developers, owners and users. They benefit the wider environment through their positive impact on sustainability, biodiversity and the attenuation of storm water. Green roofs improve the quality of life for the building users whilst providing a payback for the environment and can have wide ranging long term financial benefits.

Blackdown Green Roofs from Alumasc are available in four broad application categories, backed up by a choice of fully compatible Alumasc waterproofing systems to provide a complete roofing solution from a single source.

Extensive technical support is available on all individual projects and a fully trained and monitored network of installers for specialist systems ensure correct installation on site.

For more comprehensive product information or advice please contact Alumasc Exterior Building Products using the buttons above or visit the company website.


White House Works
Bold Road
St Helens

Tel: 01744 648400



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