CHIMNEY SPALLING - CONTENTS: What causes spalling or loss of brick or masonry block surface material from a chimney?Significance of chimney spalling on its exterior. Leaks at chimney shoulders damage building walls & interiors & invite insect pests & rot
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 at left 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.
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.
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