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.
Brick Replacement: Replacing a section of brick or an entire side can get costly, especially if you want a close-to-exact match. In the case of a chimney, the cap's bricks can deteriorate as time goes on. For a smaller area of brick, often 12 to 24 bricks, the costs can cost about $350 for the labor only. Chimney Foundation