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You should put gravel that is 3/4 to 1 inch under a concrete slab. However, depending on the project, local building codes may dictate the proper gravel size and shape. Some concrete slabs that do not hold significant weight may have a subbase of sand. Also, keep in mind that the subbase you choose will affect the cost of your concrete patio, walkway, or driveway.

As a general rule of thumb, allow 24 hours for penetrating sealers to cure and at least 48 hours of drying time for most topical sealers. Always check the instructions for the sealing product you’re using to determine the drying time.

Concrete can take years to fully settle, but interior concrete floors are mostly settled after a year. Shifting and settling can occur throughout your home’s life, but most major settling happens the first few years after the concrete is poured. It’s not uncommon for minor cracks to appear in concrete floors over time—check with a concrete pro to ensure new cracks don’t indicate a structural issue in your home.

A concrete pathway is very durable and can last upward of 30 years under normal conditions. Heavy snowfall and excessive heat may decrease this lifespan over time, as can vehicle traffic and salt applications during freezing conditions. Homeowners in extreme climates might notice cracking and deterioration after just 15 years, while those in more temperate climates should see multiple decades of life from their concrete.