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Yes, you should always wet concrete before jackhammering to avoid harmful dust from becoming airborne. According to the U.S. Occupational Safety and Health Administration, they recommend a wet-cut method that involves continuous spraying of the concrete where the jackhammer bit hits. Use a jackhammer with a built-in sprayer attachment, or have a work partner spray the area with a garden hose and spray nozzle.

Like all concrete, pervious concrete is susceptible to cracking due to expansion and contraction from freezing and thawing or heavy weight. Pervious concrete, however, is less likely to crack due to moisture intrusion than traditional concrete since pervious concrete is designed to drain and hold water in the material’s voids.

The method used to repair cracks in your concrete driveway will depend on the extent of the damage, but the most common method for small cracks is to use a driveway resurfacing compound. This solution is either cementitious or made of polyurethane, and it will seal the crack and make your driveway appear undamaged. 

For more severe cracks, you will likely need to hire a professional driveway repair service. They can use mudjacking, epoxy injections, partial driveway replacements, or a combination of these to fix more serious cracks in your concrete driveway and to prevent recurring issues.

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.