If the coil is located on the back of the zipper instead of the front it is an Invisible Zipper. Metal zippers consist of individual metal teeth. They are typically made from nickel, brass, aluminum and manganese.
Cost of Repair. The cost to re-line a chimney can be very expensive! Repair costs generally range from about $2000.00 to $4500.00 per flue or more! In a Real Estate transaction, you may have the opportunity to negotiate defects that are disclosed as part of the inspection process.
1 Simple repairs to a chimney crown can cost $500 to $1,000; more complex work (including rebuilding) can cost $1,000 to $2,500. 2  A new chimney cap costs $50 to $500, plus $100 to $200 or more for installation.  Repairs to chimney flashing cost $250 to $500.