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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.

Yes, you can pour concrete if it rained the day before, but you’ll need to drain the construction site to ensure there isn’t standing water where your slab will sit. You might need to manually remove any puddles and set up drainage on your site to dry it before pouring. Moist soil won’t be an issue, but standing water will throw off your concrete mix ratios. Additionally, ensure there isn’t more rain expected in the near future before you pour.

In many cases, you will need a building permit for your patio, but it depends on the type of patio. Generally speaking, any improvements to your land considered “permanent” will require a permit. Since a concrete patio is a permanent foundation, you will need a permit. On the other hand, a paver patio or flagstone patio usually sits over gravel and sand, are considered “temporary” improvements, and rarely require permits. To be safe, you should always ask your building department or your patio company if a permit will be necessary.

Decks are generally more expensive to build because they require elevating and railings. The difference between decks and patios is that decks are elevated, while patios are usually on the ground level. Plus, decks are usually made of wood and need more maintenance than most patios. However, decks and patios serve the same purpose, providing outdoor space for you to enjoy.