Your prefab fireplace, repaired to its manual in College Park

Rust inside the firebox

Rust spots on the firebox floor, streaks down the back panels and a flaky damper blade usually mean water is reaching the fireplace from above. In a factory-built unit, it can come in at the termination, the storm collar, the chase top or the roof around the pipe.

We follow the water back to where it enters before fixing the damage it caused, since replacing rusted parts first only starts the clock again. The leak repair and the fireplace repair are written as separate lines.

• Termination cap
• Storm collar
• Chase top
• Roof around the pipe

Minimum chimney height on a factory-built system

Factory-built fireplaces are tested with a minimum and a maximum chimney height. One maker's model needs at least 16 feet from the base of the fireplace to the top of the termination for a straight flue, more with two sets of elbows and no more than 50 feet in all, while a different model from the same maker sets 12 feet above the appliance as its minimum.

A chimney shortened during a roof job, or a system that was always short, can explain a stubborn draft problem. We measure the system against your model's figures.

Smoke detectors near a fireplace

One maker recommends installing smoke detectors and suggests placing one in a hallway next to the fireplace room, to reduce false activation from the heat of the appliance, while following any local code that requires one in the same room.

Detectors sit outside the fireplace itself, yet they belong on any list of checks before the season. We remind you of them when we finish a repair.

• One in the hallway next to the fireplace room
• Any detector your local code requires in the room itself
• Regular testing

Prefab fireplaces in condominiums and townhomes

In condominiums and townhomes, the chimney of a factory-built fireplace can run through a shared attic or chase, and the association may have rules about roof and exterior work.

We suggest checking with the association before work that reaches the roof or a shared chase. Inside your unit, the repair follows the fireplace's listing, and our written scope gives the association a clear description of the work.

• Association rules checked first
• A written scope for the association
• Roof and shared chase work coordinated