Fireplace Insert Installation in Deptford, NJ

What actually has to happen to put an insert in your fireplace

Will the insert just slide into the old firebox? Rarely. An insert needs its own stainless liner running the full flue, top to appliance. In the pre-1980 ranches and split-levels around Deptford, that flue is clay tile. Sixty-year-old mortar joints between those tiles crumble. The liner has to pass down through them. Offsets near the smoke chamber are where it binds.

So the first real question is flue size, not insert size. Narrow tile can refuse a properly sized liner. Then the smoke shelf or damper frame gets cut out. That is normal work, not a surprise charge.

Prefab zero-clearance boxes in 1980s and 2000s townhouses are different. Those are listed systems. You cannot put a wood insert into a prefab box unless the manufacturer lists it. Metal chase chimneys and pooling chase covers complicate the top connection.

We also check the crown and cap before anything goes in. Water entering a cracked crown ruins a new liner's insulation from above. Rusted dampers and firebox steel tell you humidity has been working for years.

Honest answer on old glazed creosote: it gets removed first, or the liner traps it behind stainless for good.