This invention relates to a method for manufacturing agglomerated material from retified fibers. It also relates to a coffin manufactured with such material and a profile such as a joinery profile. Said method involves a first step that consists in preparing pellets where the pellet composition is formed by extruding a mixture of retified vegetal fiber in fragmented form with a thermoplastic polymer or a mixture of thermoplastic polymers, and a second step that consists in an extrusion step from at least one pellet composition, during which the pellets are heated and mixed.
