The Top 5 Chimney Repairs Homeowners Often Miss During Roof Work

When it’s time for a roof upgrade or repair, homeowners often focus on the obvious aspects — shingles, gutters, and flashing — forgetting that the chimney is an integral part of the roofing system. Failing to maintain chimneys can lead to significant issues down the road, including leaks, structural damage, and costly repairs. Here are the top 5 chimney repairs homeowners often miss during roof work, and why addressing them is crucial for long-term durability.

1. Chimney Flashing

Chimney flashing is the sealing material installed where the chimney meets the roof. Its primary function is to prevent water from seeping into the roof structure. Many homeowners, and even contractors, tend to focus on the visible parts of the roof, neglecting the condition of the flashing. Over time, flashing can corrode, crack, or come loose due to weather exposure, leading to leaks. During roof repairs, it's important to have the chimney flashing professionally inspected and replaced if needed. Properly installed and maintained flashing provides an essential barrier against water intrusion.

2. Missing or Damaged Mortar Joints

The mortar joints between bricks in a chimney are crucial for maintaining structural integrity and weatherproofing. These joints are susceptible to cracking and deterioration over time, particularly with repeated freeze-thaw cycles. Many homeowners are unaware that gaps or cracks in the mortar can allow water to penetrate, causing internal damage or spalling of the brickwork. During roof work, a thorough inspection of the chimney’s mortar should be performed, and repointing should be done to fill any gaps, restoring both strength and weatherproofing.

3. Chimney Crown Condition

The chimney crown — the concrete or stone cap at the top of the chimney — shields it from water damage. If the crown is cracked, broken, or deteriorated, water can seep into the chimney structure, leading to extensive damage. Yet, this component often gets overlooked during roof repairs. Addressing cracks and ensuring a proper slope on the crown is essential for directing water away from the chimney. Having sealants applied or damaged crowns replaced by a professional can significantly extend the lifespan of your chimney.

4. Chimney Cap and Damper

A chimney cap prevents debris, animals, and water from entering the flue, protecting the interior of the chimney. Chimney caps are often overlooked during roof work, which can leave the chimney vulnerable to damage. Similarly, the damper — which controls airflow and heat escape — can become rusted or stuck. Properly functioning caps and dampers help prevent water ingress and maintain energy efficiency. During roof repairs, having these components professionally inspected and upgraded is a worthwhile investment with long-term benefits.

5. Structural Stability of the Chimney Stack

Over time, the chimney’s structural stability can decline due to weathering, improper construction, or previous damage. Cracks, leaning, or separation from the roofline are signs that the chimney may need reinforcement or rebuilding. Few homeowners have this evaluated during roof work unless visible damage is apparent. Addressing structural issues promptly ensures safety and prevents further damage to the roof and interior spaces.

Before You Replace Your Roof

A roof replacement or repair presents a perfect opportunity to inspect and maintain your chimney, ensuring it remains a reliable and safe feature of your home. By paying attention to chimney flashing, mortar joints, crown condition, caps and dampers, and structural stability, homeowners can prevent costly repairs and extend the lifespan of both their roof and chimney.

Your chimney is not just an aesthetic feature; it plays a vital role in your home’s overall health and safety. Don’t overlook it during your roof project.

Are You Planning a Roof Replacement in the Portland, OR Area?

If you own property in Portland, Beaverton, or Astoria, OR, or in Vancouver, WA, and plan to install a new roof, contact us at Lifetime Chimney so we can ensure your chimney is in top condition before you begin.

Lifetime Chimney is a family-owned and operated business that has been serving the Portland area for over twenty years. Schedule an appointment today.