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Hoofkantoor NV, Assendelft





Roof area:

7,300 m² intensive and 5,200 m² extensive

Green roof build-up:

Extensive: Optigreen system solution "Nature Roof"; protective fleece, 5 cm gravel drainage layer, filter fleece,  10 cm extensive substrate type E, intensive seeding: Optigreen system solutions "Garden Roof" and "Landscape Roof"; building protection mat, 10 cm gravel drainage layer, filter fleece, 30-75 cm intensive substrate type i or 15 cm lawn substrate type i and, where indicated, additional base substrate type U, lawn seeding, lawn turf, installation of shrubs and bushes, intensive public roof: Optigreen system solution "Public Roof" type "Green"; sliding film, solid body drainage type FKD 12, 0-60 cm gravel support layer, 25 cm gravel lawn layer type SR, lawn turf

Special features:

Greening for roofs and underground garages (including fire access). Fall protection system (OPTISAFE Type P) secured by superimposed load. Leak testing by electronic leak detection.

Building owner:

Kärtner Holding Beteiligungs-AG, Klagenfurt, subsidiary of Hypo Alpe-Adria-Bank International AG


Jabornegg & Palffy Architects, Vienna

Green roof

Optigreen partner company ISS Facility Services Grünraum GmbH, St. Veit an der Glan