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Mold or Efflorescence?
This heater duct is blowing directly on the concrete. It is causing moisture which is bringing what looks to be a mold-like substance to surface or is it efflorescence? Testing can tell.
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See AllNow is the time to check those downspouts for proper extensions and splash blocks. While you are walking around the exterior of the house and garage, be sure the grading is sloped away from the founda