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.
A cracked chimney crown or spalling bricks can easily cost $1,000 to repair. And, if left untreated, the damage can accelerate quickly, and cost you upward of $3,000. It doesn't have to be that way. By simply sealing the bricks and the crown and adding a chimney cap, you'll greatly extend your chimney's life.