40 Hour Property and Building Inspection Practice Test

How can one distinguish between roof sheathing sag and rafter sag from the exterior?

1. Sheathing sag shows a dishing at the ridge.

2. Rafter sag shows repetitive patterns across the roof.

3. Sheathing sag creates a consistent pattern between rafters.

4. Rafter sag causes cracks near windows.

The correct answer is: Sheathing sag creates a consistent pattern between rafters.

The option that states sheathing sag creates a consistent pattern between rafters is correct because roof sheathing is installed perpendicular to rafters and spans across them. When there is sagging in the sheathing itself, it typically results in a uniform or consistent dip that can be seen from the exterior. This sagging may correspond to the spacing of the rafters, creating a pattern that is consistent across the roof's surface. In contrast, rafter sag manifests differently. When rafters themselves sag, it can produce variable patterns depending on how each individual rafter has settled or deformed, often leading to uneven dips or peaks across the roof plane. This may not show the same consistency as sheathing sag. Additionally, other signs such as cracks near windows are often related to structural issues in the walls rather than being a direct indicator of rafter sag. Thus, understanding the distinction between the two types of sagging is crucial for a thorough property inspection.