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Control joint
A control joint is a planned weak line in concrete that encourages cracks to form in a predictable place.
Why it matters
Concrete cracks. Control joints help keep cracks straight and less visible.
Where people get this wrong
Control joints do not prevent cracks. They guide cracks. Joint spacing and timing matter.
Real-world example
A garage floor cracks diagonally across the middle because the joints were skipped. With proper joints, the crack would have followed a clean line instead.
Where this hits your build
This matters during site work and foundation. Mistakes here get buried and are expensive to fix later. Pay attention before concrete is poured.
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