Expert smoke chamber repair in Park Lake/Highland

What the smoke chamber does above the damper

A masonry fireplace has a wide firebox and a much narrower flue. The smoke chamber is the tapered space between them, rising from the throat and damper to the bottom of the flue. Smoke gathers there and is funneled upward.

Because it sits out of sight, the chamber is easy to forget until something falls onto the damper. Our pros treat it as its own part of the fireplace, with its own findings and its own line on the estimate.

• Collects smoke above the damper
• Narrows the passage toward the flue
• Carries the first flue tile at its top

Rounding the corners of the chamber

Sharp inside corners are where smoke tumbles and deposits collect. After the coat is placed, the directions we follow suggest radiusing the corners, and a straight-sided jar or bottle is one tool the maker mentions for doing it.

Rounded corners also make the finished chamber easier to brush. Our crew works each corner from the top down so the curve runs continuously into the flue, then smooths the flat faces between them with a trowel.

How a smooth chamber can help draft

Smoke rising through an even, tapered chamber meets less resistance than smoke tumbling over ledges and into pockets. That is part of why parging is offered as a chamber repair that can help a fireplace draw.

Help is the right word. A chamber repair can improve the passage, but the damper, the flue size and height and the fireplace opening all play their part. We check those too and tell you what the chamber work is likely to change before you book it.

Insulating refractory coatings

Some chamber coatings are made to insulate as well as smooth. The data sheet we follow describes its product as a refractory coating designed to streamline, strengthen and insulate masonry fireplace smoke chambers.

Insulation slows how quickly heat moves from the chamber surface into the masonry behind it. It does not change the clearance rules for framing around the fireplace. We explain what the product does, and we avoid claims it does not make.

What we look at during a chamber inspection

We begin at the firebox, open the damper and look up into the chamber with a strong light. We check the shape of the walls, the joints, any earlier coat, the buildup and the smoke shelf. Where roof access is safe, we also look down the flue to the chamber top.

We measure the opening and note the damper type and condition. Nothing is taken apart at this stage. The purpose is a clear picture of the chamber, and the written estimate follows from it.