During inspections, we often find that water entering through flashing, brick joints, or the crown causes many chimney leaks in periods of heavy rain. These small gaps let moisture in long before stains or damage appear inside the home, eventually leading to rot and deterioration around the roof structure.
Most chimney leaks can be traced back to a handful of failure points around the chimney and roof connection. When even one of these areas breaks down, heavy rain will find a way inside.
1. Faulty Flashing Around the Chimney Base
Flashing is the first line of defense against chimney leaks in heavy rain. It seals the transition between the chimney and roof, keeping water from seeping through the gap where shingles meet masonry.
Step Flashing and Counter Flashing
A proper installation includes step flashing along the sides of the chimney and counter flashing over the top edge. Step flashing diverts water running off the shingles, while counter flashing covers it to prevent water from getting behind the metal. When installed correctly, both layers work together to keep the roof watertight and the finish visually clean.
Headwall Flashing for Extra Protection
Headwall flashing should be installed on the upper side of the chimney, where the roof slope meets the wall. This protects against runoff flowing directly toward the chimney base.
Key Takeaway: Every chimney should have step, counter, and headwall flashing in good condition. Missing or improperly layered flashing is one of the top causes of leaks during heavy rainfall.
2. Missing or Damaged Chimney Cricket
A chimney cricket, also called a saddle, is a small, peaked structure installed on the uphill side of the chimney. Its purpose is to divert water away from the front of the chimney so it doesn’t pool or stagnate.
Without a cricket, water collects at the base of the chimney. Even with sealant or ice and water shield, shingles are not designed to hold standing water for long periods. Over time, ponding water leads to saturation and eventual leaks.
At Precision Roofing, we install a cricket on every chimney to prevent this issue. It’s a simple addition that eliminates one of the most common water-entry points.
Pro Tip: If your chimney sits on a steep slope or wide base, adding a properly pitched cricket can make the difference between a dry roof and recurring leaks.
Need expert help with chimney leaks in heavy rain? Contact Precision Roofing for a professional inspection and free consultation.
3. Aging Brick, Mortar, and Crown Deterioration
Masonry chimneys naturally break down over time. Brick and mortar are porous materials that absorb moisture. When exposed to years of freeze-thaw cycles, this water expansion causes cracks that allow more moisture to enter.
Tuckpointing and Crown Replacement
Most brick chimneys need tuckpointing every 15 years and may require a new capstone or crown every 30 years. These maintenance steps keep the chimney sealed against water intrusion.
Porous Brick and Weep Holes
Brick chimneys are designed with weep holes near the base to release trapped moisture. Behind the brick, there should be wall flashing that protects the home’s sheathing from rot. When mortar joints deteriorate or flashing fails, moisture can’t escape properly, leading to leaks during rainstorms.
How We Test and Detect Chimney Leaks
Our team at Precision Roofing often identifies chimney leaks through visual inspection. Missing mortar, cracked crowns, or corroded flashing are common signs. For less obvious cases, we conduct water tests by spraying the chimney for up to 30 minutes to trace the entry point.
Key Takeaway: Most chimney leaks are visible once flashing or mortar damage begins. Early inspection and maintenance prevent small issues from turning into structural damage.
Professional Solutions for Lasting Results
The best solution for chimney leaks in heavy rain is a combination of correct installation, ongoing maintenance, and proper drainage. Our technicians repair and replace flashing, rebuild deteriorated crowns, and install crickets to prevent ponding water at the base.
Protecting Your Roof and Chimney for the Long Term
A brick chimney can last for decades with regular maintenance and high-quality flashing. Ignoring early warning signs, however, leads to repeat leaks and costly repairs. Our team ensures each chimney is sealed, vented, and built to handle Kansas City’s heavy rain.
Ready to fix or prevent chimney leaks? Schedule your inspection with Precision Roofing today and protect your home from future water damage.
