Core TradesQuestion 73 of 700
Control joints (contraction joints) are tooled or saw-cut into a slab primarily to:
a.Create a weakened plane so shrinkage cracking occurs at a planned, straight location
b.Increase the slab's load-carrying capacity
c.Serve as a bond break between two pours
d.Provide a channel for drainage
Explanation
Control joints create a deliberately weakened plane, usually cut about one-quarter of the slab depth, so drying shrinkage cracks form at the joint rather than randomly. They do not add load capacity, act as isolation/bond breaks, or serve as drainage channels.
Law Reference: 2025 CA Building Code, Chapter 19 (Concrete)Practice all 700 questions free — no signup required.
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