Vermiculation is decoration of a surface by means of random channels resembling worm-tracks or honeycomb. In masonry this is typically a process of carving or finishing of building stones with irregular grooves.
In Australian terrace houses, it is often done using the same process with stucco render. Vermiculation is typically found on projecting sections of party walls, where the roof and floors meet with the party walls. It is sometimes also found as a frieze below the cornice or above it on the parapet. Rarely it is found on the facade itself or other stuccoed architectural elements made to resemble stone such as gates.