What is a common cause of structural concerns in mitigation efforts?

When considering the common causes of structural concerns in mitigation efforts, notched or drilled lumber floor joists stand out as a significant issue. Lumber floor joists are critical for supporting the weight of a building, and altering them through notching or drilling can compromise their structural integrity. This modification reduces the joists' load-bearing capacity and may lead to sagging or even failure under weight, making it a serious concern in mitigation efforts that aim to ensure safety and stability.

While excessive moisture levels can also cause structural damage, primarily through wood rot or mold growth, its effects are more indirect and related to overall health and safety rather than immediate structural failure. Inadequate insulation primarily affects energy efficiency and comfort rather than structural integrity, while incorrect paint application does not relate to the physical structure itself but rather aesthetic concerns. Therefore, notched or drilled floor joists are a more direct contributor to structural concerns in the context of mitigation efforts.