gather

A gather is the sloped or stepped masonry built at the point where a roof begins to pitch upward from a wall or where a chimney narrows as it rises. It forms the transition between vertical and sloped surfaces, creating a solid base for the roof structure while managing water drainage. The gather must be carefully built to support the weight above and to direct moisture away from the junction.

In chimney work, a gather is essential. As a chimney rises through a roof, it typically needs to narrow in section. Instead of cutting away bricks abruptly, masons build a gather: a series of stepped or angled courses that taper the chimney inward while maintaining structural integrity. This stepped reduction is stronger than a vertical cut and provides proper bearing for the flashing and roof material.

Water and Load Management

The soffit (underside) of a gather is critical. It must slope downward and outward to shed water and to allow air to circulate beneath the roof framing. A poorly pitched gather soffit becomes a trap for moisture and debris, leading to rot, mold growth, and deterioration of the junction. The gather must also be strong enough to support the roof load, which means adequate brick overlap and proper mortar bonding are non-negotiable.

Gathers appear in several contexts: beneath roof edges where eaves are built up in masonry, at chimney penetrations, at parapets where the wall continues above the roof line, and at stepped gable ends. The specific angle and construction method depend on the roof pitch and local building codes. In older work, gathers were often built with simple stepped brick courses; modern work may use tapered brick units or stone to achieve a smoother slope.

The term gather derives from the verb gather, meaning to collect or draw together. The masonry literally gathers in toward the center as it rises, narrowing the opening or transition. When a gather is not built properly, water pools, ice dams form, and the junction becomes a chronic maintenance problem. Conversely, a well-executed gather can last for decades with minimal attention.