Chimney Problems Found During a Home Inspection: Would You Flag These?

At Mahon Services, we inspect real homes every day, and sometimes one photograph can tell quite a story.

For this week’s “Would You Flag This?”, we’re taking a closer look at a masonry chimney we encountered during an actual home inspection.

At first glance, you may notice that the chimney looks a little rough. But when a home inspector looks at this area, we’re not just asking whether it looks good. We’re looking for conditions that could allow water intrusion, contribute to deterioration, or eventually require costly repairs.

So, what would you flag?

1. Deteriorated Masonry

One of the most noticeable concerns is the condition of the brick and mortar near the top of the chimney.

Masonry is constantly exposed to rain, snow, freezing temperatures, and temperature changes. Over time, moisture can enter deteriorated brick and mortar. Here in Ohio, repeated freeze-thaw cycles can make that deterioration progressively worse.

Damaged or loose masonry isn’t simply a cosmetic concern. Continued deterioration can eventually affect the stability of portions of the chimney and allow additional moisture penetration. Depending on the extent, repairs may include tuckpointing, replacing damaged bricks, or rebuilding portions of the chimney.

2. Problems at the Chimney Crown

The top of a masonry chimney is particularly vulnerable to weather.

A properly constructed chimney crown helps direct water away from the masonry below. When the top is deteriorated, damaged, improperly constructed, or missing adequate protection, water can more easily enter the chimney assembly.

Once water gets into masonry, it can contribute to cracking, mortar deterioration, staining, and additional freeze-thaw damage. This is why an inspector pays close attention to the entire chimney—not just the bricks visible from the ground.

3. Chimney Flashing Deserves a Closer Look

Now look at where the chimney meets the roof. Every roof penetration creates an opportunity for water intrusion if it isn’t properly flashed and maintained.

The flashing visible around this chimney appears to have undergone previous repairs or sealing. Sealants and roofing cement are sometimes used as temporary repairs, but extensive patching can be a clue that there has been a previous problem in the area. We evaluate flashing installation, seal condition, and evidence of interior leaks.

4. The Roof-to-Chimney Intersection

Chimneys interrupt the normal flow of water down a roof. Proper flashing details are critical for directing that water around the chimney rather than allowing it to enter between the chimney and roofing materials.

That’s why the inspector doesn’t stop after identifying deteriorated masonry. We also examine the surrounding roof covering and look inside the home or attic for evidence of moisture intrusion.

Why These Findings Matter

The important lesson isn’t simply that 'the chimney needs repair.' It’s that several components work together to keep water out of a home. Multiple deficiencies in the same area indicate that more extensive repairs are needed. That’s why a professional home inspection involves much more than walking through with a basic checklist.

Buying a Home in Central Ohio?

Don’t let the things that look fine from the ground surprise you after closing. Mahon Services Residential Inspections LLC provides comprehensive home inspections including radon testing, sewer scopes, well and septic inspections, water testing, and WDI termite inspections.

Call Mathew Mahon today at 740-868-9386 or schedule online at mahonservices.com!