Smoke chamber repair for fireplaces in Croissant Park

How a smoke shelf is meant to be built

Where a fireplace has a smoke shelf, guidance places it directly under the flue, level across the face and in line with the base of the damper. It runs the full width of the throat and may be flat or curved into the back wall.

A shelf that is sloped, broken or partly missing can collect debris unevenly. Smoke shelf repair restores a sound, even surface at that point. We describe the shelf we find and whether repair, reshaping or clearing is what it needs.

Loose brick and mortar come first

The same instructions ask for the chamber to be checked for cracked, loose or missing brick and mortar, and for obstructions, before any coating is applied. A coating cannot hold loose masonry in place, and it should not bridge over a hole.

Where we find loose or missing brick, it is reset or replaced before parging. That work appears as its own line in the estimate. If the damage is extensive, we explain whether a rebuild of the chamber would be the sounder course.

Lines a chamber repair estimate should show

A chamber repair estimate that states only a single figure tells you little about the work. Look for these lines, which show what the price covers and make proposals easier to compare.

Anything outside these lines, such as damper, firebox or flue work, is listed separately. Conditional items, such as brick that may prove loose once cleaned, are marked as such. Every line carries its own price before you approve anything.

• Cleaning of soot and glazed deposits
• Resetting loose or missing brick
• The refractory product and areas covered
• Smoke shelf repair and curing guidance

A small conditioning fire after curing

After the initial air cure, one chamber coating maker calls for a small conditioning fire before normal use. The aim is to drive out remaining moisture gently. Larger fires too soon can turn trapped moisture into steam.

We give you the conditioning steps for the product used. Keep early fires small for the period the instructions describe. If anything looks wrong during those fires, stop and tell us before continuing. The written record repeats these steps, so they are at hand when you light that small fire.