What Alumasc Roofing does

Alumasc Roofing, legally Alumasc Building Products Limited and operating as a subsidiary of London-listed Alumasc Group plc, is a UK-based specialist manufacturer of flat-roof and building-envelope waterproofing systems. Founded in 1940 and operating from White House Works, St Helens, the company also maintains a registered office at Burton Latimer, Kettering, and covers the United Kingdom and the Republic of Ireland. Its portfolio spans multiple waterproofing chemistries and formats under named sub-brands: bituminous membranes (Derbigum and Euroroof, including the Olivine CO2-neutralising variant), hot-melt structural waterproofing (Hydrotech), cold-applied liquid membranes (Caltech), single-ply PVC (Aluply), metal roofing and flat-to-pitched conversion systems (Airtile and METshield), sustainable drainage and green-roof systems (BluRoof, Blackdown, and Bio-SolaCell biosolar PV), and complementary roof accessories such as Roof-Pro supports, Sure-Foot edge protection, Harmer roof outlets, and Alumasc rooflights. Differentiated technical anchors include Hydrotech's documented zero product failures across more than 50 years of worldwide use, Derbigum's BBA-certified service life in excess of 40 years, and Olivine's mineral-based irreversible CO2 neutralisation during rainfall.

The business model is specification-driven enterprise field sales. Dedicated Area Sales Managers are assigned to defined regional territories across Scotland, Northern England, the Midlands, Wales, South West England, London & South East England, and the Republic of Ireland; each project is assigned a Technical Manager who coordinates internal resources through design, delivery, and aftersales. Specifications are influenced upstream through architects, specifiers, and structural waterproofing consultants via five CPD seminars and an extensive downloadable technical library (NBS specifications, CAD details, BBA / ETA / EPD certificates, case studies). A closely monitored, ISO-certified network of Alumasc Registered Contractors — vetted for competence and financial stability — is the sole channel eligible to install Alumasc systems under warranty. Revenue is generated through the sale of membranes, green roofs, metal tiles, rooftop supports, rooflights, and drainage outlets, with project-specific quote-based pricing, extended warranty terms up to 40 years, and a £50 million public-and-product-liability indemnity limit underwriting the warranty book. Customers span Commercial (The Shard, Canary Wharf, Meadowhall), Education (Belfast Metropolitan College, Nottingham Trent, Ulster, Queens Belfast, Dundee), Leisure (Eden Project, Tate Modern, Giant's Causeway Visitor Centre), Local Authority (Birmingham City Council, West Ham Bus Station for Transport for London), and Residential (North West Cambridge, Kew Bridge, Bromford Housing Association, Whitehouse Apartments) projects ranging from 1,000m² to over 20,000m² in installed area.

Name

Alumasc Roofing

Legal name

Alumasc Building Products Limited

Website

https://alumascroofing.com

Company type

Private

Founded year

1940

Operating status

Operating

Headcount range

51–100 employees

Short description

Alumasc Roofing is a UK-based waterproofing and roofing systems manufacturer serving commercial, residential, education, leisure, and public-sector construction across the UK and Ireland through specification-driven field sales and a registered-contractor network, with proprietary sub-brands and sustainability-differentiated products.

Ownership category

akta.pro rank

Product category

Commercial Roofing and Waterproofing Materials

NAICS

Asphalt Shingle and Coating Materials Manufacturing (324122), Asphalt Paving, Roofing, and Saturated Materials Manufacturing (32412), Roofing Contractors (23816)

SIC

Asphalt Paving & Roofing Materials (2950)

akta.pro primary industry

Roofing Systems & Waterproofing (Membranes, Shingles, TPO/EPDM, Liquid-Applied) (IMAFAMAA)

Keywords

• Flat roof waterproofing
• Bituminous membranes
• Green roof systems
• Structural waterproofing
• Building envelope solutions

Headquarters

HQ city

St. Helens

HQ country

United Kingdom

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Waterproofing and Building Envelope Product Sales: Revenue generated from the sale of manufactured waterproofing membrane products, green roof systems, metal roofing tiles, rooftop support systems, rooflights, and roof drainage outlets. Products are sold directly through Area Sales Managers and via a network of registered contractors who install the systems.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

Alumasc Roofing manufactures and supplies flat roof and building envelope waterproofing systems, including bituminous membranes, hot melt waterproofing, cold applied liquid membranes, single-ply membranes, metal roofing, green roof systems, and blue roof stormwater management solutions. Products are sold direct and through a network of trained Registered Contractors across the UK and Ireland, with dedicated Technical Managers assigned to each project.

Product overview

Alumasc Roofing is a building materials manufacturer offering a comprehensive portfolio of waterproofing, roofing, and sustainable drainage solutions. The product range comprises multiple sub-brands including: Bituminous Membranes (Derbigum and Euroroof ranges), Hot Melt Waterproofing (Hydrotech), Cold Applied Liquid Membranes (Caltech), Single-Ply Membranes (Aluply), Metal Roofing (Airtile, METshield), Sustainable Roofing Solutions (BluRoof stormwater management, Blackdown green roofs, carbon neutralising Olivine membranes, Bio-SolaCell solar integration), and Roof Accessories (Roof-Pro support systems, Sure-Foot guardrail, Alumasc rooflights, Harmer roof outlets). The portfolio includes complementary products for surface preparation (Monoscreed), insulation (Vtherm), and ancillary flashing. These products serve commercial, residential, education, leisure, and local authority building sectors across the UK and Ireland, with technical support services including NBS specifications, CAD details, and registered contractor networks.

Differentiator

Problem solved

Functional benefit

Brands

• Derbigum: Reinforced bitumen membranes for waterproofing applications
• Euroroof
• Hydrotech
• Caltech
• Aluply
• Airtile
• BluRoof
• Blackdown
• Roof-Pro
• Harmer
• Sure-Foot
• Vtherm
• Monoscreed

Products and services

• Derbigum Membrane Reinforced bitumen membrane offering high performance waterproofing with BBA certificate confirming service life in excess of 40 years, for commercial, education, residential, leisure, and local authority building projects.
• Derbigum Olivine Membrane CO2 neutralising reinforced bitumen membrane using a naturally occurring Olivine mineral upper layer that reacts with CO2 in rainfall to neutralise it over the membrane's lifetime, providing positive climate impact.
• Euroroof Premium Membrane Premium bituminous membrane solution for flat roof waterproofing applications, serving construction projects across multiple sectors.
• Euroroof Mono Membrane Single layer, flame-free waterproofing bituminous membrane with typical life expectancy exceeding 20 years for flat roof applications.
• Hydrotech Hot Melt Waterproofing Hot melt liquid structural waterproofing with self-healing monolithic membrane formulation, manufactured using 20% post-consumer recycled material. The first hot-melt waterproofing system introduced to the UK construction market with zero product failures during over 50 years of worldwide use.
• Caltech UV Cold Applied Liquid Membrane Cold applied, UV resistant liquid waterproofing membrane applied without heat or flame for roofs, balconies, and coating applications.
• Caltech FCP Fast Cure Polymer Fast cure polymer waterproofing resin for rapid installation on roofs and balconies, applied without heat or flame.
• Aluply PVC Fleece Backed Membrane Adhered single-ply PVC membrane with fleece backing for enhanced adhesion on flat roof waterproofing applications.
• Airtile Lightweight Steel Roof Tiles Lightweight steel roof tiles made from Aluzinc offering high quality, long-lasting strength and 100% recyclability at end of life for pitched roofing applications.
• Airtile Flat-to-Pitch Conversion System Conversion system for transforming flat roofs into pitched roofs using Airtile lightweight steel tiles, including 40-year warranted installations for social housing refurbishment.
• BluRoof Stormwater Management System Single-source waterproofing and sustainable urban drainage (SuDS) solution that combines waterproofing with stormwater attenuation, reducing and controlling peak discharge through detention up to a prescribed hydraulic head with subsequent controlled release.
• Blackdown Intensive Green Roof Intensive green roof system with varied landscapes and deeper substrates for recreational use, providing habitat creation, air and noise pollution reduction, carbon emission reduction, and rainwater retention.
• Blackdown Extensive Green Roof Lightweight green roof system with minimal maintenance requirements providing biodiversity, rainwater attenuation, and sustainability benefits.
• Bio-SolaCell Biosolar System Biosolar green roof system combining photovoltaic panels with vegetation, delivering combined renewable energy generation and ecological/amenity benefits.
• Roof-Pro Bespoke Rooftop Support Solutions Bespoke building services support systems for rooftop installations, including riser penetration units designed for quick installation and watertight pipe and cable entry points.
• Sure-Foot Guardrail Edge Protection Lightweight edge protection system providing collective fall protection on flat roofs for safe maintenance access.
• Alumasc Rooflights Individual rooflights and continuous roof glazing systems providing natural daylighting to building interiors.
• Harmer Roof Outlets Aluminium and cast iron roof outlets for flat roof drainage, including spigot/screw connection variants and detail outlets for complex roof geometries.
• Vtherm Vacuum Insulated System Vacuum insulated roof system providing thermal performance in a slim profile for low upstand waterproofing installations.

Quantifiable outcome

• Hydrotech has had zero product failures during over 50 years of worldwide use
• +4 more outcomes

Named customers17 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Scale indicators4 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Tremco Roofing: Tremco (RPM International) is a broad building envelope incumbent offering built-up, modified bitumen, single-ply and liquid-applied roofing systems. Its UK and European operations overlap with Alumasc across commercial waterproofing specifications.
• Sika Roofing: Sika is a global construction chemicals and roofing systems incumbent offering single-ply (Sarnafil), bituminous and liquid waterproofing. While not UK-roofing-only, it competes with Alumasc across commercial flat-roof and podium waterproofing specifications.
• Carlisle Construction Materials: Carlisle is a large North American and European manufacturer of single-ply EPDM, TPO and PVC roofing membranes. It overlaps with Alumasc's Aluply PVC single-ply range in commercial and industrial flat-roof specifications across international markets.
• Firestone Building Products: Firestone (now part of Holcim) is a global manufacturer of EPDM and TPO single-ply roofing membranes and insulation systems. It is a broad incumbent competing with Alumasc's Aluply single-ply membranes in commercial flat-roof specifications.
• Soprema: Soprema is a global waterproofing manufacturer with bituminous, single-ply, liquid and green roof systems. It is a broad incumbent that competes with Alumasc in the UK bituminous and SuDS segments, particularly on large commercial specifications.

Direct peers

• BMI Group: BMI Group (formerly Icopal and Siplast) is one of the largest pitched and flat roofing manufacturers in Europe, including significant UK bituminous membrane operations. It directly competes with Alumasc on commercial flat-roof waterproofing, single-ply and bituminous specifications.
• IKO: IKO is a major manufacturer of bituminous waterproofing membranes and flat-roof systems with a strong UK presence. Its polymeric and torch-applied membranes compete directly with Alumasc's Derbigum and Euroroof ranges across commercial and residential projects.
• Langley Waterproofing Systems: Langley is a UK-focused waterproofing contractor and systems supplier specialising in flat-roof and podium waterproofing with BBA-certified systems and warranties. It targets a similar commercial, education and local authority specification customer base to Alumasc.
• Axter: Axter is a European bituminous and synthetic waterproofing membrane manufacturer with a UK operation. It competes directly with Alumasc on bituminous flat-roof systems, including torch-on, self-adhesive and high-performance warm-roof assemblies.
• Bauder: Bauder is a UK-based manufacturer of flat roof waterproofing, green roof and blue roof systems with a comparable multi-technology portfolio (bituminous, single-ply, hot melt, cold liquid, green/blue). It competes head-to-head with Alumasc across commercial, education and public sector specifications in the UK.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

• Xx.com/AlumascRoofing

Compliance9 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Subsidiaries5 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Alumasc Roofing