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Spalling damage on masonry chimneys: This article defines chimney spalling and describes the causes and significance of spalling on masonry chimney exteriors.
We show examples of different types of brick spalling or concrete block spalling ("cinder block spalling") damage and we explain its causes.
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Causes, Impact & Repair of Spalling Chimney Exterior Surfaces
Spalling describes the chipping off or loss of surface from a masonry material. Spalling can occur on a brick chimney such as the one shown at left, on masonry block chimneys, and on other masonry surfaces such as sidewalks or foundation walls. The chimney is also "supported" by a metal strap tying it to the home.
[Click to enlarge any image]
In our photo at above left you can see that leaks at the chimney top from an improperly sealed chimney crown have sent water into the chimney structure. Not only has the face broken away from some of the bricks, leaving their softer interior exposed to the weather, but also bricks have been dislocated and are being pushed off of the chimney.
Spalling can occur even in warm climates when a masonry product is soft, porous, improperly made, or improperly constructed. But spalling damage is often most severe in northern climates where a freeze-thaw cycle can cause frost to actually break and push off masonry fragments.
Our photo below shows typical brick chimney spalling - notice that ultimately entire bricks can be lost leaving a hole in the chimney and accelerating water and frost damage.
We sometimes find bricks have been lost entirely from a chimney and we have to ask if the bricks fell into the flue (blocking it and making it unsafe). Our photo at above right shows a spalling concrete block chimney.
A spalled chimney may also have a damaged and unsafe flue.
A detailed inspection of the flue interior is in order. But usually spalling and frost damage occur only on the exterior portions of a chimney exposed to weather, not on the interior portions that run inside of a building.
Below we illustrate spalling on a concrete block chimney.
Watch out: water and frost damage to masonry chimneys can lead to costly damage, fire and flue gas hazards, and even chimney collapse hazards.
See CHIMNEY COLLAPSE RISKS, REPAIRS
This spalling and cracked masonry chimney exterior was observed near Sharon Ct. and illustrates leaks into and thorugh the chimney structure.
Notice the brown stains exuding from the chimney face about 12 feet below the chimney top? That's a sure indication of water and condensate leaking from the chimney interior out through the masonry structure of the chimney.
The flues in this chimney need to be inspected for safety and the chimney top cap repaired.
See
CHIMNEY FLUE INSPECTION CAMERA
and
see CHIMNEY CRACK DETECTION & DIAGNOSIS for details.
See SPALLING CONCRETE BLOCK WALLS & CHIMNEYS for help identifying block foundation damage and for more about spalling concrete block.
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Continue reading at CHIMNEY CRACK DIAGNOSIS or select a topic from the More Reading links or topic ARTICLE INDEX shown below.
Or see BRICK WALL FROST & WATER CRACKS, EFFLORESENCE, SPALLING
Or see CHIMNEY REPAIR METHODS
Or see FOUNDATION DAMAGE & REPAIR GUIDE - home
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CHIMNEY SPALLING at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.
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- Eric Galow, Galow Homes, Lagrangeville, NY. Mr. Galow can be reached by email: ericgalow@gmail.com or by telephone: 914-474-6613. Mr. Galow specializes in residential construction including both new homes and repairs, renovations, and additions.
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