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.
Install the new flue pipe. 1  Install an increaser in the largest hole in the chimney. 2  Install smoke caps in the smaller holes and seal them with furnace cement. 3  Install an increaser on the flue base on the water heater.  Install the 90-degree elbows on the two increasers, and then rotate the elbows so that they're aligned with one another.