Pipitea Plaza, Wellington

The Pipitea Plaza is one of Greenroofs Ltd more recent installations. Spread across three levels, each level is looked down onto by staff within the building. Planted using a colourful mixture of sedum, succulents and grasses and interspersed with areas of Otaki pebbles and Riwaka Gold, the roof is designed to please the eye.

Location:  Pipitea Plaza, Wellington, NZ

Client:  Wellington Tenths Trust with Redwood Group

Living roof installation:  Greenroofs Ltd

Architect:  Zac Athfield, Athfield Architects

Project Manager/Contractor:  Naylor Love

Development Type:  Commercial Office Space

Client Brief:  Roof top gardens on three levels. Each level is looked down onto by staff within the building so has to be aesthetically pleasing. The green roof will be used to reduce stormwater runoff and to help to protect the roofing membrane. The planting needs to be saline tolerant and to be able to withstand strong winds as the building is close to the Wellington Harbour.

Living Roof Design:   The total green roof area is 605m2 of planting and 630m2 of pebbles and chip. Each level of green roof is planted to reflect three different colours, white, pink and yellow, which will be achieved through the foliage colour of the plants as well as the flowers. Sedum/succulents and grasses have been used with the emphasis on a specific colour for each level. The planting is in blocks of sedum/succulent species and blocks of pebbles/chip. Otaki pebbles, from the North Island and Riwaka Gold chip, from the South Island, have been used for contrast. All planting materials were sourced from the north island of New Zealand and manually plug planted. Planting is saline tolerant and is able to withstand strong winds from the Harbour. A drainage layer and fleece was installed on top of the waterproofing, followed by installation of the growing medium and plants.The green roof will not only reduce stormwater runoff, but will also help to protect the roofing membrane.

Comments:  The building has achieved a 5 star Green Star rating for office design from the NZGBC. The green roof helped the project to achieve points under the Green Star NZ certification process.Maintenance will be required once the plants are established to ensure the designs/plant blocks remain intact.

Completion:  December 2010