CSRE National Practice Test

What is the main function of a collar tie in roof framing?

Helps prevent rafter sag Improves insulation Supports ceiling joists directly Prevents water leakage

Correct Answer:

Helps prevent rafter sag

Explanation:

Collar ties are placed high between opposite rafters to keep the roof from spreading outward under load. By tying the rafters together near the top, they resist the outward thrust that tends to push the walls outward and lift the ridge, which stabilizes the roof frame as a single unit. That stiffer frame also helps limit deflection, so the rafters don’t bend or sag as much under weight. They aren’t aimed at insulation, they don’t directly carry ceiling loads, and they aren’t about sealing against water. The key idea is preventing the rafters from pushing the walls outward and the ridge apart, keeping the roof shape stable.

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