This picture shows a joint between an existing masonry wall and a newly installed six-stories high curtain wall. The joint was designed to be one inch wide.  Unfortunately, the existing masonry wall was built out the plane. During the curtain wall erection on the second floor there was no more room left at some spots between brick and end vertical mullion. Third floor was even worse as the existing wall was found tilting outward.

Finally the curtain wall has been narrowed, instead of chipping out the brick.  The horizontal mullion's have been re-cut and the new, narrower glass lites have been ordered.

This example shows that the essential joints shall be always designed with sufficient room left for allowance and error or the existing conditions should be surveyed.