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Do some research before hiring a concrete contractor . Consider asking whether the contractor is insured, if they can provide references of past clients you can contact, and if this type of work requires a permit. Another potential question is how long they guarantee their work.

For handy homeowners, concrete projects are DIYable, and DIYing is a good way to save on the cost of a concrete slab, walkway, or other concrete work. If you’re completing a larger project or one that’s subject to building codes, you should always hire a professional to ensure the job is done safely and correctly.

Unfortunately, concrete cracks happen, so there’s no surefire way to avoid them long-term. To slow down the cracking, apply a sealant every two to three years and use sand rather than salt to melt snow or ice. Using salt speeds up the freeze-thaw cycle, which may increase the likelihood of cracking. Additionally, keep vehicles and heavy machinery off of your concrete, as the weight can lead to more cracking.

The actual moisture level that is acceptable for your concrete floor depends on what primer or flooring material you plan to install above it. For this reason, you should check the manufacturer’s instructions for the exact details.

Generally, the moisture levels should be 3.5% to 4.5%, although it does vary. Some products can handle higher levels of moisture, so you should always test your concrete before purchasing your flooring materials.