Your prefab fireplace, repaired to its manual in Pershing

Inserts inside a factory-built fireplace

An insert placed inside a factory-built fireplace changes how that fireplace heats and vents. One maker's manual warns against installing an insert in its firebox unless the insert maker's instructions specifically state that this fireplace has been tested for use with that insert.

We read both labels and both manuals before an insert is discussed. If an existing insert sits in your prefab unit without that match, we explain what the documents say and what your options are.

Clearances between the unit and the framing

Zero clearance describes a design, and the design still has clearances. One maker's model lists minimum clearances to combustibles at the back and sides of the fireplace, to the ceiling, in front of the opening and to the outer pipe of the chimney.

Remodels sometimes push framing, backer board or trim tighter than those figures. We compare what we can see with the manual for your model and list any clearance that needs correcting.

• Back and sides of the unit
• Ceiling above it
• Floor space in front of the opening
• Outer pipe of the chimney

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.

The first fire after a prefab repair

New parts can come with break-in instructions from their maker, and we follow whatever comes with yours. Before we leave, we open and close the damper, check the doors or screen and walk you through lighting the first fire.

Keep that first fire modest and watch how it draws. Anything that seems different from before is worth mentioning to us, so we can talk it through while the repair is fresh.

• Damper opened and closed
• Doors or screen checked
• Break-in instructions followed
• A modest first fire