Metawell® panels with tongue and groove allow – in a simple way – the installation of large-format acoustic ceiling sails. The largest sail of this project has a dimension of 4450×5580 mm. Drywall work is not necessary for fast and clean installation. The hook profiles are already installed to the backside of the panels and must only be hung. Thanks to the flatness of the panels the joints are hardly visible.The connection was realized with tongue and groove as a retrofit at the company Heikes.