Humber/Ontario Real Estate Course 4 Exam Practice

If a home's roof sags between trusses, what is the most likely cause?

1. Thin sheathing

2. Unsuitable flashings

3. Attic condensation

4. High roof pitch

5. Excessive snow load

6. Poor weatherproofing

The correct answer is: Thin sheathing

A sagging roof between trusses typically indicates that there may not be enough support to handle the weight above it. Thin sheathing can potentially contribute to this issue, as it may not provide adequate structural integrity for the roof as a whole. When the sheathing is insufficiently thick or strong, it can lead to sagging under various loads, including the weight of roofing materials, as well as snow and other environmental factors. Looking at the other possibilities: unsuitable flashings may cause water intrusion and leaks but do not directly contribute to structural sagging; attic condensation is more related to moisture issues than to the actual support of the roof structure; high roof pitch generally reduces the risk of snow accumulation, which is less likely to cause sagging; excessive snow load can lead to sagging, but the question focuses on the structural support, where sheathing plays a critical role; and poor weatherproofing relates to the exterior protection of a home rather than the physical integrity of the roof's structural components. Thus, focusing on the structural implications, thin sheathing aligns most closely with the cause for roof sagging between trusses.