GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Audio Play Icon Headphones Icon Plus Icon Minus Icon Check Icon Print Icon Picture icon Single Arrow Icon Double Arrow Icon Hamburger Icon TV Icon Close Icon Sorted Hamburger/Search Icon

Community and Q&A

Why is this brick eroding?

Richard Hogan | Posted in General Questions on

I have an interesting thing happening to my brick chimney. We noticed that two of the bricks, their faces, kind of crumbled off. Not the white powdery residue but actually powdered off in the same color as the brick. Looking for a reason why this might be happening. We live in Missouri (St. Louis). In the pictures the picture labeled “Brick 2” is what the effected brick looks like. The other picture is a typical smooth brick on our chimney.

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.

Replies

  1. User avatar GBA Editor
    Martin Holladay | | #1

    Richard,
    These may simply be old bricks that were not fired properly -- weak bricks that aren't durable.

    Or the problem may be due to an oversized flue (leading to corrosion caused by flue gas condensate). For more information on the latter problem, see When a Flue is Too Big.

Log in or create an account to post an answer.

Community

Recent Questions and Replies

  • |
  • |
  • |
  • |