Abstract: The invention relates to building construction and to the production of building products and can be used for constructing low rise residential, industrial and administrative buildings for different climatic zones. The invention increases the quality of products having a complicated geometric configuration, extends the range thereof and makes it possible to obtain the precise geometrical shape of the products. The inventive universal multicavity cassette mould is embodied in such a way that it is multisectional and has the form of crest-forming elements rigidly fixed to a frame, articulated drop sides being also fixed to the frame. Groove-forming and crest-forming elements are fixed to the opposite longitudinal sides, respectively. The articulated drop sides are provided with locking elements, the upper groove-forming elements being disposed in such a way that they are dismountable.