While not all mold is as evident as the above photo, here are conditions in a home that may be conducive to mold growth:
Tree roots that have infiltrated storm and sanitary lines. Water backs up and basement wall moisture is evident.
Poor grading - flat or negative slope at the foundation wall is a sure sign of moisture in the home. Water takes the path of least resistance.
Downspout flow from gutters needs to be taken away from the structure. Splash blocks are not sufficient to do this, especially on flat or rolling grades.
Efflorescence (white powdery substance) and staining on: chimneys, foundation or basement walls, till, retaining walls, or any other home surfaces are an indication of moisture penetration.
Flashing changes in roof elevations, flashing not properly sealed, poor maintenance of roof and gutters may indicate a moisture problem.
Ventilation - lack of roof and crawl space ventilation. If you do not see vents, or verify that the vents are truly cut-through or not blocked, there will be mold growth. It is difficult to determine ventilation in cathedral ceilings or roof lines w/o attic entrances.
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