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Crumbling brick on chimney

Hello all, New to the board, and have a question.

Our house was built in 1901, we purchased it 4 years ago. I noticed that the brick is getting "bubbles" that will break if touched, resulting in holes. The brick is very powdery when it bubbles out and if scraped at in the holes.

It looks as if the previous owners may have used a drylock type coating on it. The chimney is only used for the gas hot water heater, as their is not a firplace in the house, uncertain as if there ever was.

What is the cause of this, and more importantly what can I do to fix it?

Re: Crumbling brick on chimney

I think I figured out what this is, would this be brick "spalling" and if it is I guess I have no choice but to replace what I can....


Re: Crumbling brick on chimney

You are most likely getting moisture behind the bricks. That can be from no cap or a damaged cap on the chimney, or condensation caused by inadequate draft for the hot water heater. A proper sized chimney liner and cap should help resolve the problem.

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