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Harmer Building Drainage manufacture a total solution from roof outlet to below-ground drainage.
Harmer, part of Alumasc Water Management Solutions, is a market leader in engineered drainage systems for commercial, residential and public-sector buildings. At Gutter Centre, we supply the full Harmer range, including high-capacity roof outlets, floor drains, balcony drainage, and cast aluminium components designed for long-term durability and efficient water management.
Manufactured from aluminium and stainless steel, Harmer drainage products offer excellent corrosion resistance, low weight for easy installation, and high hydraulic performance. Their engineered outlet profiles, secure clamping assemblies and precision-machined components ensure watertight reliability across flat roofs, podium decks, wet rooms and high-traffic interior spaces.
Harmer’s roof outlets provide efficient surface water removal across warm roof, cold roof and inverted roof build-ups. Designed with hydraulically optimised sumped bodies, they deliver exceptional flow rates while maintaining membrane integrity.
Key Benefits
Harmer roof outlets are widely used on commercial roofs, multi-residential buildings, education facilities and public-sector developments.
Harmer floor drains are engineered to remove water efficiently from interior spaces such as plant rooms, commercial kitchens, washrooms, showers and utility areas. Their smooth internal geometry and stainless steel components support hygiene and ease of maintenance.
Performance Advantages
These floor drains are commonly installed in leisure centres, restaurants, healthcare facilities and high-traffic commercial buildings.
Harmer’s cast aluminium components provide a modern, lightweight alternative to cast iron. They offer long service life, excellent corrosion resistance and a clean architectural finish.
Common Products
These systems work particularly well in contemporary residential and mixed-use developments where aesthetics and longevity are priorities.
Harmer remains a trusted choice for building drainage due to:
High hydraulic performance across roof, terrace and floor systems
Durable non-ferrous metal construction with long service life
Compatibility with all major waterproofing membranes
Lightweight components for simplified installation
Precision-engineered assemblies for watertight reliability
Suitability for commercial, residential and industrial environments
Harmer Building Drainage provides complete, engineered solutions that enhance water management, protect building integrity and support modern architectural design. Whether your project involves a flat roof, podium terrace or internal wet-area drainage, Harmer products deliver performance you can rely on.
| Qty | Saving | Each ex. VAT |
|---|---|---|
| 1–4 | — | £115.79 |
| 5–9 | 5% off | £110.00 |
| 10+ | 10% off | £104.21 |
| Qty | Saving | Each ex. VAT |
|---|---|---|
| 1–4 | — | £21.42 |
| 5–9 | 5% off | £20.35 |
| 10+ | 10% off | £19.28 |
| Qty | Saving | Each ex. VAT |
|---|---|---|
| 1–4 | — | £211.60 |
| 5–9 | 5% off | £201.02 |
| 10+ | 10% off | £190.44 |
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