Zero-clearance fireplace repair by local pros in Kirkman South

Alterations that take a fireplace out of its listing

Makers draw a clear line around changes to their units. One maker lists actions that void its warranty and that it disclaims responsibility for, including modification of the fireplace, its components, doors, air inlet system and damper control, and use of component parts it did not make or approve.

Past owners and past remodels sometimes altered a unit by trimming a panel, removing a shield or blocking an air inlet. We look for those changes, explain what each one affects and list what it takes to return the fireplace to its intended build.

What refractory panels do inside the firebox

Many wood-burning factory-built fireplaces line their steel firebox with molded refractory panels on the sides, the back and the floor. One maker's parts list names separate left, right, rear, bottom rear and bottom front panels, held in place by retainers.

The panels take the direct heat of the fire and shield the metal behind them. When a panel breaks apart, the fire can reach steel that was never meant to face it, which is why panel condition is one of the first things we check.

• Left and right side panels
• Rear panel
• Bottom rear and bottom front floor panels
• Retainers that hold them in place

Caring for tempered door glass

Tempered door glass is tough within limits. One maker says its glass withstands a gradual temperature rise beyond what a normal fire produces, and that the glass must warm slowly and evenly. It warns against letting flames touch the glass and against slamming or striking the doors.

Cleaning takes the same care. The manual calls for a commercial glass cleaner or soap and water, no abrasives and no cool water on glass that is still hot. Cracked or chipped glass is replaced with the maker's part before the doors go back into use.

Rattles, ticks and pops from a prefab unit

Steel expands as it heats and contracts as it cools, so a factory-built fireplace ticks and pops as a fire starts and dies. A new rattle, a loud bang or a change in the sound can point to a loose panel, a free damper weight or a separated joint.

Tell us when the sound happens and where it seems to come from. We match that description with what we find in the firebox and along the chimney.