What must be provided where masonry is used as veneer for a framed chimney?

In the context of building construction, particularly when masonry is used as a veneer for a framed chimney, it is essential to manage moisture effectively to prevent damage to both the chimney and the underlying framing.

Through flashing is a critical component that directs water away from the chimney and prevents moisture from infiltrating the veneer and the structure behind it. This flashing is typically installed at points where the chimney meets the roof or other surfaces to create a waterproof barrier.

Weep holes are also important because they allow any moisture that may enter the masonry veneer through its own natural permeability to drain out. This prevents water from accumulating within the wall assembly and causing rot, mold, or deterioration of the materials over time.

Thus, both through flashing and weep holes serve crucial functions in moisture management. Because they address different aspects of potential water intrusion—one by preventing water from entering (through flashing) and the other by allowing trapped water to escape (weep holes)—the correct answer indicates that either solution or their combination can meet building code requirements and best practices for maintaining the integrity of a chimney constructed with masonry veneer.