Understand the two flashing roles
Flashing directs roof water around the chimney and back onto a drainage path. Counterflashing protects the upper edge of that connection at the masonry. Both need to integrate with surrounding materials. Their exact arrangement depends on the roof and chimney geometry.
A repair description that says only “seal chimney” leaves important questions unanswered. Ask which component failed, whether metal is being replaced and what preparation is included. A surface treatment is not automatically equivalent to rebuilding a defective connection.
Consider water entering above the roofing
Chimney masonry, joints, caps and related components may also admit water. If moisture comes from above the roof intersection, roofing work alone may leave the cause untouched. An assessment should distinguish those possibilities and identify when a masonry professional is needed.
Indoor stain position can be misleading because water moves through the assembly. Describe when it appears and whether earlier repairs changed the pattern. A roof visit may establish some observations while leaving concealed areas uncertain.
Plan how repair connects to the existing covering
Replacing flashing often requires disturbing adjacent roofing. Ask whether that material can be handled and reinstated or whether additional replacement is needed. Brittle or discontinued shingles can affect both the work and the visual match.
If a roof replacement is already planned, specify the chimney detail in that scope. Do not assume new shingles include new flashing or chimney repairs. Any component proposed for reuse should be evaluated for condition and compatibility.
Keep appearance and performance in the same discussion
Where a property has a historic designation, check the applicable review for proposed changes. The building’s existing appearance is relevant, but it does not make a failing component serviceable. Share photos and the desired result while asking how water protection will be achieved.
Retain a written description of roofing and masonry responsibilities, photos of completed details and the actual warranty terms. If moisture returns, those records help determine whether it involves the repaired connection or another part of the chimney assembly.
One more useful question
Can new shingles leave a chimney leak unresolved?
Yes. If the source is a flashing connection or masonry above the roof, replacing the covering without addressing that detail may not stop the water.
Further technical reading
Manufacturer references are educational; they do not imply certification or affiliation.
GAF: understanding roof flashing