Framing & StructuralQuestion 401 of 700
In conventional roof framing with rafters bearing on exterior walls, what is the PRIMARY purpose of ceiling joists or an equivalent tie connecting opposing rafters?
a.To support the finished roofing weight only
b.To provide attic storage capacity
c.To align the ridge board vertically
d.To resist rafter thrust that would otherwise push the walls outward
Explanation
Ceiling joists or rafter ties act in tension to resist the outward thrust that sloped rafters exert on the walls at their bearing. They are not solely for roofing weight, attic storage, or ridge alignment; without the tie the walls could spread and the ridge could sag.
Law Reference: 2025 CA Residential Code §R802.4Practice all 700 questions free — no signup required.
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