Settlement Tank Roofs

Grit chambers, decanters and settlement tanks are a common source of odour complaints on a wastewater site, since the liquid surface is left open to the air. Settlement Tank Roofs close that surface with a self-supporting, corrugated aluminium roof, cutting the volume of gas and odour able to escape from underneath. The roof is lightweight enough to span the tank without heavy support structures, and its aluminium construction resists corrosion with virtually no maintenance over its working life.

We engineer every roof specifically for the equipment it covers, rather than supplying a generic size. Roofs arrive in modules that bolt together on site, so your team can assemble and disassemble sections quickly whenever maintenance access is needed, without having to remove the whole structure. A wide range of accessories, fastening elements and grips lets us adapt each installation to the tank’s geometry and your site’s specific requirements.

Settlement Tank Roofs are built from aluminium 3003 H16, designed to Eurocode 1 and Eurocode 9 structural standards. Each roof is calculated using matrix and finite element analysis, and every design is backed by drawings and assembly instructions specific to that installation. This engineering approach means the roof suits tanks of different geometries and shapes, rather than a one-size-fits-all corrugated tank cover system.

Compared with GRP (glass-reinforced plastic) roofs, Settlement Tank Roofs offer several practical advantages:

• Lighter and easier to handle than GRP during installation and maintenance
• Non-polluting, where GRP disposal carries its own cost and environmental impact at end of life
• Corrosion-resistant and uniform across the entire surface, with aluminium protecting itself against corrosion rather than relying on a coating
• Adaptable to form pipe penetrations, manholes, and fittings around other tanks on site
• Competitively priced against equivalent GRP tank containment systems

For UK wastewater sites managing odour complaints or permit conditions around grit chambers and decanters, this roof offers a lighter, lower-maintenance alternative to GRP tank containment systems, engineered to your specific tank rather than sold as an off-the-shelf size.

Key Features

• Self-supporting corrugated aluminium construction
• Lightweight design that minimises gas and odour volume beneath the roof
• Highly corrosion-resistant, low-maintenance aluminium 3003 H16
• Designed to Eurocode 1 & 9, with finite element calculation
• Modular panels for straightforward assembly and disassembly
• Bespoke engineering for each tank’s geometry and shape
• Wide range of accessories, fastening elements and grips
• Adaptable for pipe penetrations and manhole fittings
• Competitively priced against GRP alternatives