Repairing cracked chimney brickwork in South Miami Heights
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Chimney masonry damage you can see
- Top courses shifted out of line
- Plants growing from chimney joints
- Caulk smeared over cracked joints
- Paint peeling off chimney brick
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Chimney masonry from the roof line down
Bricks that rock under light pressure
A brick that moves when pressed has lost its bond with the mortar around it. Loose units tend to show first in the top courses and at the corners, where water and wind do the most work.
Loose bricks can fall, so keep the area below clear. We check by hand where we can reach safely and mark the extent of the looseness. A few loose units can be taken out, cleaned and relaid. Looseness that runs deeper usually means a section needs relaying, and we explain where it ends.
Mortar is chosen, not simply mixed
Masonry mortar comes in standard types defined by ASTM C270, from stronger to weaker mixes. Each suits different brick and different exposure. The brick industry's guidance on mortar selection explains how to match the type to the job.
On the estimate, we describe the mortar in plain terms rather than by a type letter alone. It is suited to your brick, no harder than it, and matched in color and finish. Ask us the reasons behind the choice and we will explain them.
A water repellent comes last, if at all
Clear repellents lower the amount of rain a brick face takes in. The brick industry's guidance puts repellents after repairs to brick, mortar and flashing. It also limits them to products that let water vapor pass, such as silanes and siloxanes.
We treat a repellent as an optional item, not as the repair. If it suits your chimney, chimney waterproofing covers the product and the application once the masonry has dried. If it does not, we say so plainly and leave it off the estimate.
Setting a replacement brick
A replacement brick is set into a mortared opening with its faces fully buttered. It is pressed into position, centered, and the joints around it are pointed and tooled to match the wall. The brick industry's guidance sets out that sequence.
Full joints around the new unit keep water out, and matching the tooling keeps the repair from standing out. When several units are replaced near each other, they are set so the joint lines stay straight. The estimate lists how many areas are involved and how the new units were chosen.
What your chimney mason prices
- Repair mortar matched to existing brick
- Masonry at the flashing joint reset
- Structural check flagged where cracks suggest it
- Tie-in with crown and flashing work noted
Chimney masonry questions asked in South Miami Heights
Can you repair cracks without taking the chimney down?
In many cases, yes. Cracks confined to joints or a few bricks can be repaired in place. Cracks that suggest movement need their cause assessed first, and we explain that before any price is given.
Do you replace single bricks or whole sections?
Both, depending on the damage. A few broken units can be cut out and replaced. When loose or damaged brick runs through several courses, relaying that section is usually the sounder repair.
Why did an earlier masonry repair on my chimney crack again?
Common reasons are water still reaching the masonry, continued movement or a repair mortar harder than the brick. We look for the reason before repeating anything, so the new repair addresses it.
More Ways to Care for Your Fireplace
- Chimney Sweep and Chimney CleaningArrange careful chimney cleaning in Miami with a defined scope, protected work area and useful findings.
- Wood-Burning Fireplace Insert InstallationFit a wood-burning insert after assessing its host fireplace and full connection requirements.
- Chimney Chase Cover ReplacementReplace the chase top with a properly planned cover and clearly defined pipe connections.
- Chimney Flashing RepairRepair the chimney-to-roof connection with a scope that accounts for the adjoining roofing and masonry.
- Chimney TuckpointingRenew deteriorated mortar joints around chimney bricks that can appropriately remain.
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Chimney & Fireplace Brands We Work With
DuraVent 
Olympia Chimney and Venting 
Copperfield Chimney Supply 
Rutland 
Heatilator 
Heat & Glo