In cooperation with

Bloc Roof Manchester 

Innovative roof to offer climate resilient vision for Manchester.

Manchester, United Kingdom
Bruntwood Works
Water capacity
525 m2


A closer look at this build-up at this project:

Work has been completed on the installation of a ground-breaking climate and water resilience research roof in the heart of Manchester.

Innovative roof to offer climate resilient vision for Manchester.


Mitigate the impact of climate change

Unlike conventional green roofs, which use a drainage layer to simply remove rainwater, the 525 sq m blue-green structure retrofitted to Bloc’s flat roof stores rainwater beneath the planted surface where it lands. Advanced passive irrigation components within the attenuation layer draw water up through the structure to the underside of the green roof substrate to support surface planting. 

The blue-green roof will help to develop a greater understanding of how new construction and data technologies can help cities and urban developments to mitigate the impact of climate change and population growth, while enhancing biodiversity.

“By introducing integrated natural habitats across the urban landscape, we create healthier, more resilient communities that are highly carbon and energy efficient.”


Multifunctional blue-green roof System

The hollow Permavoid subbase makes it possible to store more rainwater in lightweight geocellular units underneath the soil in podium decks, blue-green roof systems and roof gardens. This stored rainwater is made available to the plants by capillary rise through capillary fibre columns in the Permavoid units. This nature- based solution of capillary irrigation eliminates the need for drip lines, valves, hoses, pumps and the associated maintenance requirements. Water is available for the plants when they need it, naturally, on-demand, and most importantly without the use of energy; just like in nature.

Water is the key to successful green infrastructure at any level, in every green design. Keep rainwater out of the sewer and put it to work to support, biodiversity and help cool the urban environment.

See how we do Multifunctional roofs

Inspiring projects

Multifunctional Roofs

Find your local distributor nearby.

Permavoid source control ensures that no precious water goes to waste by catching, storing and reusing stormwater for irrigation, evaporation and infiltration. Find your local Permavoid distributor here to learn more about the technology and become part of the international movement.