The cantilever of this formeret allowed them to build the vault, which rests on the formeret, narrower than the width of the aisle. Masons used the top of this rounded wall surface as a platform to project the large, flat bricks of the formeret (Fig. Where the formerets have disappeared in the third bay of the northern aisle wall, a section of this profile is still visible (on the right in Fig. In each bay, on top of the aisle wall, the outside edge of the brick courses forms a semicircular profile. For the base of the vaults, masons used corbel construction (horizontal coursing), and for the webs, they used true-vault construction (nonhorizontal coursing) with temporary centering. Two standard techniques of groin construction were used to make the vaults in the side aisles at Lomello. Have been left in such a ruined state that the bricks in the webs and cross section of the vaults are completely exposed (Fig. Lomello, Santa Maria Maggiore, nave, northern aisle, three western bays. The vaults in the three western aisle bays of the parish church of Santa Maria Maggiore at Lomello provide an important exception because they 15.
This condition usually makes the study of vault construction impossible. In most important early eleventh-century Lombard churches, the plaster that covers the vaults masks the bricks in the webs.
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