Should You Seal Concrete Expansion Joints. Caulking the joints and cracks is the best way to stop this from happening. How do you seal gaps in concrete? A sealer is soft and able to accommodate the concrete slab's expansion and contraction.
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However, joints need to be filled with soft, pliable material so that rainwater can't get under the concrete, which could cause the construction to sink or heave. Before sealing concrete, make sure the surface is clean and dry. I like to use a high quality urethane caulk.
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This will ensure a water tight seal. How do you reseal concrete expansion joints? Sealers and fillers for concrete joints are not the same thing and have very different purposes. These joints are placed in the slab as an allowance space for concrete expansion.
