Sealing or rebuilding the chimney crown in South Miami

Forming a new crown in place on the chimney

A cast-in-place crown is built on the chimney. Forms are set around the top, reinforcement is placed, and concrete is poured and shaped. The finished crown should slope away from each flue and overhang the brick with a drip.

Brick industry guidance asks a cast crown to keep the same thickened shape as a precast one, rather than thinning out toward the edge. We explain the shape planned for your chimney before work begins. Exact dimensions follow the construction and the applicable requirements, so they are confirmed on site.

Conditions that decide sealing or replacement

The choice between coating and a new crown comes down to a few conditions. We check each one on your chimney and explain what we found.

When all of these hold, a coating may be a sensible repair. When one or more fails, a coating would cover a problem it cannot solve, and we explain replacement instead.

• The concrete is firm and still attached to the brick
• The crown slopes away from every flue
• The edges keep real thickness and overhang the face
• The joint at each flue can be resealed

Appliances that vent into the chimney during crown work

A chimney may serve more than the fireplace. A furnace or water heater can vent into one of its flues. Crown work must not block a flue that an appliance depends on, even for a short time.

Tell us about every appliance connected to the chimney before the visit. We plan the work so that flue stays open, and we explain whether the appliance should be turned off during any part of the job. Its own servicing is not part of crown repair.

Crowns and dampers mounted on the flue top

Some chimneys carry a damper mounted on the flue top, worked by a cable from the fireplace. Its frame usually sits on the liner or on the crown around it. Crown repair may need that damper taken off and set back.

We check how the damper is fixed and whether it is in working order. If it can be reused, it is reinstalled when the crown work is complete. If it is damaged, replacing it is a separate item with its own explanation. The crown scope does not hide damper work.