Wednesday, June 18, 2025
Q. After much research, we chose brick for our new house. It has been a nightmare getting satisfaction from the mason who did the work. We noticed after only a few months that there were white powder-like streaks across the brick walls in many places. We spoke with the brick manufacturer, who said it sounded like an installation problem or streaking from other materials around it. The mason came back and looked at it. He used acid and brushed one spot and it lightened up but didn’t go away. He seemed annoyed with us, and said he could “send someone” to brush and put more cleaner on, but the whiteness would remain and it would have to “weather” after that. We had a sample wall built to make sure the color was right, and really went to a lot of effort for our choices. We are upset that the mason acted like it was our fault for complaining. We selected brick for high durability, weather resistance and low to no maintenance, and now we have this problem. What could have caused it, and is there any other remedy?
A. Brick was a great choice for all the reasons you described, and will outlast generations of occupants if installed correctly. The whiteness may be caused in a few ways. You have to first know what caused it.
Trim materials, above and around brick, will streak from the wrong paint on roof-edge or top-of-wall trim. If the paint used was interior latex water-soluble paint, it will separate and run. Prefinished metal, factory finished, will also start to chalk and run. If a highly pigmented paint with low-resin binder was used, then the same results occur. The brick will be somewhat cleanable, but will have to be exposed to many cycles of rain, heat, freezing, etc., also known as weathering.
Because the mason did not mention the runoff of paint from trim, I suspect that your problem is the worst-case scenario, and all the cleaning with muriatic acid and a steel brush will not solve the staining entirely. Wire brushing or high power-washing actually harms brick, because that amazingly strong fired-finish on the brick, the reason brick is such a good resister of the elements, is now going to be broken down to a grainy finish that can harbor mildew.
Sadly, the issue was completely preventable, either by using trim that did not lose color or by the brick installation. Yes, the brick installation. It starts with not having the correct width of the foundation to carry the brick, so it is installed too close to or right against the exterior plywood. That airspace is supposed to be 2 inches, clear, behind the brick, so rain that gets sucked into the mortar joints can drop behind the brick and “weep” from weep holes at the bottom of the wall. If you do not have weeps, then the wall was installed incorrectly and the problem will continue. Good luck!
© 2025 Monte Leeper. Readers are encouraged to send questions to yourhousedr@aol.com, with “Herald question” in the subject line, or to Herald Homes, 2 Endo Blvd., Garden City, NY 11530, Attn: Monte Leeper, architect.
