The Wolverton, Milton Keynes landscape contractor installed the 500 square metre wildflower roof on a new state-of-the-art £16m water pumping station designed to protect the city of Hull from flooding. The station is capable of pumping four tonnes of water per second – the equivalent of filling an Olympic-sized swimming pool every two minutes.
It has been built by main contractor Black & Veatch in an area close to private residents so a sloping green roof was designed to screen it from view. Arup was also involved in a project as a consultant.
Bridgman and Bridgman co-founder Chris Bridgman said: "This is a sloping pitch room from the ground, it looks like there’s not a lot of brickwork there. What’s quite unique is that it’s the first we know of that can be lifted off."
The installation took three weeks and five people to complete.
"We broke it into bite-size pieces and lifted them into place using a crane," Bridgman told Horticulture Week. "It meant that we had all our materials cut into 42 trays of equal size, that was quite a new approach. It worked well on site. The can lift a section off, or can lift all 42 trays off at once then put them back on again."
The roof needs to be accessible so client Yorkshire Water can access the storm water screw pumps within the building".
Bridgman and Bridgman, which installs about 250 living roofs a year, used an Optigreen FKD 58 system - a wildflower blanket pre-grown in Holland with an added anti-slip system.
"We used a pre-grown sedum mat and succulent plants, ideal for drought conditions and also wind tolerance. It was all done in sectional areas, each one was sectioned out and made slip-resistant, and a lot of restraint was put in.
Bridgman & Bridgman was established in 2006 by Bridgman and his father Neil Bridgman team and installed its first living roof in 2009. Since then, it has constructed Europe’s largest turf roof and Scotland’s biggest wildflower roofscape. In 2014 the company became the first living roof installer in the country to achieve a National Vocational Qualification in green roof construction and maintenance, assessed by European Green Roof Federation president, Dusty Gedge.