What is NOT considered a warning sign of potential building collapse?

Sagging gypsum or wall board, while it can indicate potential structural issues, is not specifically recognized as a direct warning sign of imminent building collapse in the same way that other options are closely associated with structural compromise. Cracks or separations in walls and foundations typically indicate significant structural distress that could lead to collapse. Loose bricks, blocks, or stones also directly suggest stability issues, as they may signify that the structural integrity of a wall or façade is compromised. Dark smoke from a truss roof or floor is particularly alarming, as it can point to fire impingement on these structural members, which is a critical warning sign that a collapse could occur.

In contrast, while sagging materials can signal problems, they are often more associated with load distribution or moisture issues rather than an immediate risk of collapse. This distinction highlights why sagging gypsum or drywall may not be considered as urgent a warning sign compared to the others listed.