Give weathered masonry a proper repair.
Find the extent of the damage
Loose mortar, cracked crowns and flaking brick deserve a closer look. Ground-level photos and a description of when the damage appeared help start the conversation. A qualified assessment should determine whether localized work is appropriate or a larger repair is needed.
Repointing, crown work and rebuilding are different jobs
Repointing addresses deteriorated mortar joints. Crown repair or replacement concerns the protective top of a masonry chimney. Rebuilding replaces damaged masonry. Ask for a proposal that identifies the affected areas, materials and how the work relates to any existing leak.
Plan for access and Minnesota weather
Roof pitch, chimney height and safe work access affect the job. Temperature and weather can affect masonry work and curing. Confirm permit requirements with the provider and local authority, and ask who handles roof protection, debris and cleanup.
Check the City of Rochester permit guidance for your scope.