Source google image: http://sc2a.eu/amenagement-comble/wp-content/gallery/pose-du-plaques-de-placoplatre-placo-dans-les-combles/100_0520.jpg
Comble rail
Source google image: http://sc2a.eu/amenagement-comble/wp-content/gallery/pose-du-plaques-de-placoplatre-placo-dans-les-combles/100_0520.jpg