What It Does

The brick and mortar you see outside aren’t just for looks. They’re the armor that protects your chimney from rain, snow, sun, and everything else the weather throws at it.

Bricks are tough, but they’re also porous. Each brick in your chimney can absorb roughly a cup of water. Over time, water works its way in, freezes, expands, and starts to crack or flake the surface. That slow, steady damage can eventually reach the inside of the chimney or even the walls of your home.

What Can Go Wrong

Here’s what to look for:

• White powdery stains on the brick (that’s called efflorescence)

• Cracked or missing mortar joints

• Flaking, chipping, or “spalling” bricks

• Rust stains or dark streaks running down the sides.

 These are all signs that moisture is already making its way in. Once that happens, repairs get more expensive fast.

How the Pros Fix It

A certified chimney sweep can spot problems early and keep water out before it causes major damage. They can replace missing mortar, swap out bad bricks, and apply waterproofing treatments that protect your chimney without trapping moisture inside.

One of the most effective solutions is ChimneySaver Water Repellent, a professional-grade treatment that forms a breathable barrier on the surface. It keeps water out while letting trapped vapor escape, which helps prevent cracking, spalling, and other water-related damage.

The Products They Trust

ChimneySaver Water Repellent: A professional-grade waterproofing treatment that blocks water penetration but still lets the chimney breathe. It helps prevent cracking, spalling, staining, and long-term deterioration. There are several types of ChimneySaver Water Repellent. Your chimney professional will know which type matches your project’s needs.