A method for forming an object by joining a first component and a second component which are made with respective materials both containing fibres which include natural fibres, wherein at least one component selected from either the first component or the second component is subjected to moulding, and wherein the first component and the second component are joined during a pressing step in which a joining portion of the first component is pressed into contact with the second component, the joining portion being delimited by an anchoring surface intended to be joined to the second component, and wherein, before the pressing step, on the anchoring surface;
- fibres are present that are at least partially free, in order to promote joining of the first component and the second component.