Joints & cracking
Sourced answers on joints & cracking, written for the person standing in front of the problem.
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1
How do you fill cracks in concrete?
Decide first whether the crack moves. Moving cracks take a flexible sealant, static ones take epoxy or patching mortar. Prep and backer rod decide the result.
2What is a control joint in concrete?
A control joint is a planned weak line that tells a slab where to crack. Space it 2 to 3 feet per inch of thickness and cut it a quarter of the slab depth.