Method of preparing and installing a 3-dimensionally extending false ceiling or wall having a shape of a 3-dimensionally extending surface, the 3-dimensionally extending false ceiling or wall comprising a plurality of flat ceiling or wall tiles, the flat tiles being mineral fibre based tiles, each having a front major surface being adapted to be visible, an opposing back major surface and one or more edge surfaces extending along the perimeter of the flat tile and connecting the front and back major surfaces, wherein the front and back major surfaces are parallel to each other, and wherein the flat tiles are adapted to be connected to and suspended to a framework by a plurality of elongated suspension elements and thereby form said 3-dimensionally extending false ceiling or wall, the method comprising:
- calculating format, position and orientation for each individual flat tile in the 3-dimensionally extending suspended ceiling or wall,
- associating each individual flat tile with a unique tile identity,
- producing the individual flat tiles according to the calculated format, and
- providing each respective flat tile with its respective tile identity,
- providing a representation of the 3-dimensionally extending false ceiling or wall including an association of the position of each respective flat tile with its respective tile identity, and
- calculating at least one of positions of connection points on the flat tiles for each one of said individual flat tiles for which said format, position and orientation in the 3-dimensionally extending false ceiling or wall have been calculated, and positions of connection points on connection elements interconnecting said individual flat tiles for which said format, position and orientation have been calculated,
- wherein the suspension elements are adapted to be attached to the flat tiles or to the connection elements at the calculated connection points for suspension of the flat tiles,
- providing each respective flat tile with a preinstalled connection element or with a marking indicating where a connection element or a suspension element is adapted to be connected to the respective flat tile,
- calculating, for each suspension element, an attachment position at which attachment position the suspension element is adapted to be attached to the framework, the calculation being performed relative to a representation of the framework, the calculation also including calculation of orientation and length of said suspension element,
- associating each individual suspension element with a unique suspension element identity,
- providing a representation of the 3-dimensionally extending suspended ceiling or wall including an association of the attachment position of each respective suspension element with its respective suspension element identity and including information concerning calculated orientation and length of each respective suspension element with its respective suspension element identity, and
- installing the 3-dimensionally extending suspended ceiling or wall to a physical location including an a plurality of installed tiles and a plurality of installed suspension elements each comprising an installed connection position of each respective suspension element with its respective installed suspension element identity according to the representation and the calculated orientation and length of each respective suspension element with its respective suspension element identity, wherein the installed connection position of each respective suspension element with its respective installed suspension element identity includes an installed calculated orientation and the installed calculated orientation of at least one of the suspension elements comprises at least one of an acute angle and an obtuse angle of the installed suspension element relative to its respective installed tile.