Prefab Chimney Repair in Spring Hill, Florida

How a Prefab Metal Chimney Is Built

A factory-built chimney is not one pipe. It is a run of sections stacked from the top of the fireplace to the roof. One fireplace maker's installation manual describes its chimney as double-wall snap-lock pipe: a stainless steel inner flue, a galvanized outer pipe and a wire spacer that holds the gap between them, in lengths from 12 to 48 inches. Supports carry the weight, firestops close the ceiling openings, and at the top a storm collar, a flashing or chase top and a termination cap keep the water out.

Every one of those parts was tested with the fireplace below it. Section R1005.4 of the Florida Building Code, Residential, says the chimney of a factory-built fireplace meets UL 127, the same standard as the fireplace, and section R1005.1 says it is installed and terminated to the maker's instructions.

Metal Chimney Repair Starts With the Label

Before any part is ordered, we find out exactly what system you have. The fireplace carries a label, usually inside the opening or behind the lower grille, with the maker, the model and the chimney it was listed with. One maker's manual even has the installer put an identifying label on the chimney sections themselves. With that information, a rusted cap, a section or a storm collar can be matched part for part.

That matters because pipe that looks the same is not the same. Section diameters, joint styles and the air space between the walls can differ from maker to maker and from model to model. A part from another system may slide on, but it is not covered by your fireplace's listing, and the joint it makes has not been tested at all.

Chimney Pipe Replacement, Section by Section

Most repairs are at the top, where rain hits first. A corroded cap is replaced with the termination listed for the system; a storm collar that slid down the pipe is reset and sealed; a section that rusted through at the chase top is cut out and replaced. Inside the chase, a joint that pulled apart is relocked; that manual checks each joint by pulling up on the section after it locks.

While the chase is open we check the things that do not show from below: firestops in place at each ceiling, the attic shield, the straps, and the clearances to framing. The same manual warns never to fill the chimney enclosure with blown insulation, and we pull out any we find packed against the pipe.

Water that got in at the top usually damaged more than the pipe. A rusted chase top is replaced as chimney chase cover work, and rotted framing as a chimney chase repair.

When the Listing Forces a Whole-System Change

Makers change their models over the years, and parts for an older system are not always still supplied. When the maker or its successor no longer supplies the listed chimney parts for a model, there is no honest way to patch the run with something else. That maker's manual says that altering the fireplace system, chimney components included, may void its listings and approvals and could result in an unsafe installation.

At that point the choices are to stop using the fireplace, or replace the fireplace and its chimney together as one new listed system. We tell you that plainly in the estimate, and the full job is priced as fireplace replacement. What we will not do is mix brands to keep an old system going.

Your Prefab Chimney Inspection

The free inspection reads the label, looks up the chimney from the firebox, checks the attic run and walks the roof to the cap. The written estimate names each part from the listed system, or explains why the system cannot be repaired. Old pipe and caps leave with our experienced crew; we are local, family-owned and Proudly American.