Deterioration of the chimney cap can be attributed to weathering and inappropriate seals between the flashing and the chimney. Regular inspections will save you thousands of dollars in chimney repairs. The difference between traditional masonry caps and metal caps have been a point of contention in recent years.The Ontario building code (Section 18.104.22.168.2) is clear on two facts:
- The chimney cap must be sloped from the chimney lining to the edge,
- and the chimney cap must provide a drip edge.
This is not the case with metal caps generally produced in the Ottawa region. There are a few exceptions with custom copper or aluminum caps made on site. These metal chimney caps can be made to meet the Ontario Building Code. Flat tin chimney caps do not meet the Ontario Building Code. The joints are soldered, not folded and the craftsman create a ribbed fold to provide proper rigidity and protection. Custom made caps on site are very expensive and not suited for the general home owner.