Abstract: An apparatus for constructing a masonry structure comprises a rigid backing panel with rows of rectangular openings formed therein. Attached to the backing panel and extending outwardly therefrom is a wire structure formed to define a plurality of brick receiving compartments substantially overlying the openings in the panel. The compartments are sized and arranged to accept a plurality of bricks and support them in spaced relationship. A mortar applying tool having a nozzle extending in the space between the bricks and rollers adapted to roll on the surface of the brick adjacent the space is used to fill the spaces between the brick with mortar while simultaneously sculpting the exposed portion of the mortar in the shape of the end of the nozzle.