40 Hour Property and Building Inspection Practice Test

What do intermediate support or collar ties primarily help prevent?

1. Rafter collapse

2. Rafter sag

3. Deter pests

4. Roof leaks

The correct answer is: Rafter sag

Intermediate support or collar ties are specifically designed to help prevent rafter sag in roof structures. Rafter sag occurs when the weight of the roofing materials, along with any additional loads such as snow or ice, causes the rafters to bend or deflect downwards. By utilizing collar ties, which are horizontal members located high on the rafters, the structural integrity of the roof is enhanced, allowing the weight to be distributed more evenly and ensuring that the rafters maintain their intended shape. This is particularly important in maintaining the overall aesthetic and structural performance of the roof over time. In contrast, while prevention of rafter collapse is important, it is the sagging of rafters under load that collar ties primarily address. Collar ties do not serve the function of deterring pests or preventing roof leaks, as these issues are related to different aspects of building and roof design. Therefore, the emphasis on preventing rafter sag illustrates the specific role that collar ties play in roof framing and structural support.