Family-owned smoke chamber repair serving Oakland

Clearing debris from the shelf

A pile on the smoke shelf is more than untidy. Damp debris holds moisture against the masonry, and a large pile can crowd the damper and keep it from closing fully.

We remove everything on the shelf by hand and vacuum before any repair, then look at the surface underneath. If the debris includes old nesting material, we note it, because it tells us something about the cap. Any animal removal is a separate service, quoted on its own line.

Parging or rebuilding the chamber

Parging is right for a chamber whose masonry is sound but rough, stepped or gapped. The coat smooths, seals and can reshape the chamber. Rebuilding is right when the walls are loose, badly cracked, missing brick in large areas or clearly too thin.

The line between the two is not always sharp. When a chamber sits near it, we price both options and explain the difference in cost and in what each fixes. Some chambers get a partial rebuild of the worst area, then a full coat.

Prefabricated smoke chamber linings

Not every chamber is laid brick by brick. Section R1001.8.1 mentions prefabricated smoke chamber linings, which are shaped units set into a masonry fireplace to form the chamber surface. Where one is used, its inside face may tilt up to 45 degrees off plumb.

A prefabricated lining can crack or shift like any masonry unit. We identify it during the inspection, check its joints and its seat on the throat and plan repairs that suit it. The estimate explains what kind of chamber you have.

What a chamber estimate lists

A clear chamber estimate separates the work into parts you can understand and approve one by one. Ours list preparation, masonry repair, the coat itself, the shelf and any damper, cap or firebox work beside it.

Each line has its own price, and the total does not change later without your approval. If cleaning uncovers something new, we stop and talk it through before adding anything.

• Cleaning and glaze removal
• Loose brick, joints and throat repair
• Refractory coat, walls and thickness
• Smoke shelf repair
• Related items on their own lines

Refractory mortar and ordinary mortar

Masonry mortar for exterior walls and chimney joints is made to handle weather, and it is the right product there. Inside a smoke chamber, the exposure is heat, and the code calls for refractory mortar instead.

Mixing the two up leads to failures, such as ordinary mortar used to patch a chamber that crumbles after a season of fires. We use each where it belongs and name both in the estimate when a job involves inside and outside masonry.