List of products by brand Harmer Building Drainage

Shop Harmer flat roof outlets, floor drains and balcony drainage at The Gutter Centre. Part of Alumasc, Harmer offers high-performance aluminium, cast iron and stainless steel outlets for flat roofs, podium decks, terraces and internal wet areas.

Shop Harmer roof outlets, floor drains and balcony drainage online at The Gutter Centre. Harmer, part of Alumasc Water Management Solutions, is a market leader in engineered building drainage for commercial, residential and public-sector buildings. We supply Harmer high-capacity roof outlets, floor drains, balcony and terrace outlets, and cast aluminium drainage products designed for long-term durability and efficient water management.

Made from aluminium, cast iron and stainless steel, Harmer drainage products offer excellent corrosion resistance and high hydraulic performance. Engineered outlet bodies, secure clamping rings and precision-made components give reliable, watertight performance on flat roofs, podium decks, balconies, wet rooms and busy internal areas.

Harmer Flat Roof Outlets

Harmer flat roof outlets remove rainwater efficiently from warm roof, cold roof and inverted roof build-ups. Their hydraulically designed sumped bodies give high flow rates while protecting the integrity of the waterproofing membrane.

Key Benefits

• Aluminium, cast iron or stainless steel bodies for long-term durability
• High-capacity sump designs reduce ponding and roof loading
• Secure clamping systems compatible with a wide range of waterproofing membranes, including single ply, bituminous and liquid-applied systems
• Vertical, horizontal (spigot) and parapet outlet options
• Lightweight aluminium options for fast installation

Harmer roof outlets are widely used on commercial roofs, apartment buildings, schools and public-sector developments.

Harmer Floor Drains and Gullies

Harmer floor drains and gullies remove water efficiently from internal areas such as plant rooms, commercial kitchens, washrooms, showers and utility areas. Smooth internal surfaces and stainless steel components support hygiene and make maintenance easy.

Performance Advantages

• Available in aluminium, cast iron or stainless steel
• Trapped and untrapped options
• Removable gratings for easy cleaning
• Suitable for concrete, screed and tiled floors
• Gratings designed to resist blockages in busy areas

Harmer floor drains are commonly installed in leisure centres, restaurants, healthcare facilities and busy commercial buildings.

Harmer Balcony and Terrace Drainage

Harmer balcony outlets, spigot outlets and terrace drainage products remove rainwater from balconies, podium decks and roof terraces. Lightweight cast aluminium options give a long service life, excellent corrosion resistance and a clean architectural finish, and can be colour-coated to suit the building design.

They're especially well suited to contemporary residential and mixed-use developments where looks and longevity matter.

Why Choose Harmer Drainage?

• High hydraulic performance across roof, terrace and floor drainage
• Durable aluminium, cast iron and stainless steel construction
• Compatible with a wide range of flat roof waterproofing systems
• Lightweight options for easier installation
• Precision-engineered for watertight reliability
• Suitable for commercial, residential and industrial buildings

At The Gutter Centre, we supply Harmer roof outlets, floor drains and balcony drainage with nationwide delivery. Need help choosing the right Harmer outlet for your roof build-up or