Abstract: A process for the production of particulate board from a matrix of flake or particles mixed with a cementitous material includes the steps of continuously feeding the matrix into a press, applying at least one of steam and gas or gases to the matrix to cure same to form the particulate board, and removing steam and gas or gases therefrom by vacuum assistance. The apparatus includes press and diffusion belts, which guide the matrix through a nip, where it is compressed into particulate board. Upon exiting from the apparatus, the boards so produced are cut into predetermined lengths.