One approach to perform the design for production of masonry with BIM tools is to explicitly represent the wall elements. However, this strategy decreases the application performance because of model complexity. Generative Modeling is a modeling paradigm aimed at defining rules and applying them for generating models. The masonry block placement is associated with a set of rules, making the use of generative modeling a viable solution to implicitly represent the blocks. This paper presents some preliminary results of our research on investigating if Generative Modeling can help in the representation of masonry modulation and for the proposal of a shape grammar for representing its basic elements.