Green Roof Case Study

Extensive, Steep Curved Timber Roof, Erosaweb, Recycling & Energy Facility,Cross Green, Leeds, UK

Project Information

Client:Leeds City Council
Contractor:F K Roofing/Geogreen Solutions
Consultant:ABG Technical Services
Product:Roofdrain, Trigrid, Erosaweb, Growing Media, DF irrigation, Sedum blanket
Quantity1,800m2
Benefits:- Aesthetics - Green Look
- Biodiversity
- Sound Insulation

The iconic Leeds RERF (Recycling and Energy Recovery Facility) is the flagship development at the heart of Leeds Integrated Waste Strategy over the next 25 years. The energy from waste plant is designed to treat the 214,000 tonnes of household waste generated in Leeds in one year. The landmark 42m high glulam timber framed building (the largest timber framed building in the UK and the largest green wall in Europe) which houses the incinerator was shortlisted for a RIBA 2016 award. The associated domed timber roofed structure used to store the incinerator bottom ash has a green roof finish and was a finalist in the 2016 UK Roofing awards.

The Challenge

ABG were asked for a solution to cover the domed facility with a green roof. Creating an attractive low maintenance green roof on a steep light weight domed structure. For plants to grow successfully the right environment needs to be created. Plants need stable soil conditions, light, moisture and nutrients. To hold sufficient growing media in stable conditions on a steep slope requires a skin surface retention system which is structurally strong enough to prevent the whole  mattress from sliding off the smooth roof.

The Solution

The ABG Erosaweb geocell was the ideal solution to retain pockets of the growing media over the whole surface preventing soil movement. The smooth surface of the dome meant that the ABG Erosaweb geocell needed to be reinforced by tying it to the ABG Trigrid geogrid suspended in sheets from carefully positioned anchor point using sealed bolts into the roof structure, through the waterproofing membrane. Geogreen placed a layer of ABG Roofdrain under the soil retention system to drain excess rain water away whilst acting as a reservoir board to retain irrigation water. For the steeper parts of the slope an additional DF irrigation hose system was installed to prevent drying in hot conditions. The green roof combined with Europe’s largest artificial living wall provided a biodiverse and aesthetically pleasing finish to this facility.

The ABG Service

ABG provided a turnkey solution for this part of the project, which was a particularly difficult dome shaped green roof, taking it from design right through to installation. The whole project was finished 3 months ahead of schedule.

Contact ABG today to discuss your green roofing or drainage project specific requirements and discover how ABG past experience and innovative products can help on your project.

geotextile and geocell provide a stable surface for the green roof growing mediaGeogreen Solutions working from harnesses to install the three layers bolting them to the timber structure to provide a stable surface to encourage growth
Finished lightweight ABG Green Roof SystemFinished lightweight ABG Green Roof System
ABG Erosaweb geocell, Trigrid geogrid and ABG Roofdrain anchored to green roofABG Erosaweb tied to ABG Trigrid laid on ABG Roofdrain anchored to roof
ABG Deckdrain used in a green wall applicationLargest green wall in Europe using ABG Deckdrain


Erosaweb Geocell

Erosaweb geocell is designed for the reinforcement of weak soils and has many applications including retention of soils on steep slopes and highway and rail embankments. The cells of the geocell retain the fill material, while allowing water through.

more...

Erosaweb Geocell is a cellular confinement system

Roofdrain

Roofdrain is designed for use in extensive green roof systems. It provides both drainage and attenuation in a convenient, lightweight and cost effective system.

more...

Roofdrain drainage geocomposite for green roofs, blueroofs and roof SuDS attenuation

Trigrid Geogrid

Trigrid EX is an innovative high performance geogrid combining fibre-reinforced polymer strips within a woven structure. Its junctions are high-strength welded which helps create an interlocking structure from a powerful combination of hybrid materials.

more...

Trigrid Geogrid
 

Products

Erosaweb Geocell

Erosaweb geocell is designed for the reinforcement of weak soils and has many applications including retention of soils on steep slopes and highway and rail embankments. The cells of the geocell retain the fill material, while allowing water through.

more...

Erosaweb Geocell is a cellular confinement system

Roofdrain

Roofdrain is designed for use in extensive green roof systems. It provides both drainage and attenuation in a convenient, lightweight and cost effective system.

more...

Roofdrain drainage geocomposite for green roofs, blueroofs and roof SuDS attenuation

Trigrid Geogrid

Trigrid EX is an innovative high performance geogrid combining fibre-reinforced polymer strips within a woven structure. Its junctions are high-strength welded which helps create an interlocking structure from a powerful combination of hybrid materials.

more...

Trigrid Geogrid
 

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