Chimney Leaks and Cracked Flashing

Many homeowners call for a “roof leak,” but the real issue is often the chimney system—specifically the flashing and the masonry areas exposed to weather. Because a chimney breaks through the roof surface, it creates multiple joints where water can enter if any part of the system is worn or improperly installed.

Why chimneys leak so often

A chimney takes constant exposure from rain and sun, and it also experiences temperature shifts that cause small movement. Over time, those shifts can break down mortar joints and sealant, and they can separate flashing from the chimney or roof surface.

Common leak points include:

• Step flashing along the sides of the chimney

• Counterflashing where the chimney meets flashing

• Cracked or deteriorated chimney crown

• Missing or damaged chimney cap

• Worn mortar joints that let water absorb into the masonry

Once water gets in, it can spread into the attic, insulation, roof deck, and even wall framing—creating stains that look like a roof failure.

Warning signs your chimney may be the problem

You don’t need to climb on the roof to notice early clues.

• Stains on ceilings or walls near the fireplace area

• Musty odors after rain

• White chalky residue on bricks (efflorescence)

• Cracked mortar joints or loose bricks

• Rust stains near the fireplace damper or firebox

• Dripping sounds during storms

If any of these signs are present, an inspection can prevent more expensive structural repairs later.

What proper chimney repair should include

Effective chimney repair isn’t just “adding caulk.” A long-term fix usually includes some combination of:

• Rebuilding or repointing damaged brick and mortar

• Repairing or replacing the chimney crown

• Installing or upgrading the chimney cap

• Correcting the flashing system so it sheds water properly

• Addressing nearby roofing materials to ensure a watertight transition

When chimney repairs are done correctly, they can also extend the lifespan of the roof by stopping moisture at one of the most common entry points.

Why delaying chimney repairs increases costs

Water intrusion doesn’t stay in one place. A small leak can lead to:

• Rotting roof decking and rafters

• Mold growth and insulation damage

• Interior drywall and paint repairs

• Repeated roof “patches” that don’t solve the cause

Fixing the chimney early often costs far less than repairing structural components later.

Need chimney repair in Astoria or nearby areas?

 All Borough Home Improvements  provides chimney build and repair services, including flashing corrections to stop leaks at the source.

• Address: 18-39 42nd St Astoria, NY 11105 United States

• Phone: (718) 751-5101

• Email: info@allboroughhomeimprovements.com

• Website: www.allboroughhomeimprovements.com