Rot loves moisture, so deck rot typically impacts the parts of a board that stay wet. This includes the underside of boards, in addition to support posts and joists. However, any part of a board can rot, given the right conditions. 

Yes, it is generally safe to have a fire pit on a deck, but you must adhere to building codes and take several safety precautions. For both built-in and freestanding models, you must use a heat-resistant barrier, such as a fire pit pad or heat shield, between the pit and the deck. Additionally, consider the weight of the fire pit and ensure your deck can structurally support it, reinforcing it if necessary. The fire pit must also be positioned a safe distance from your house, particularly from materials like vinyl siding, to prevent heat damage.

You typically don’t need a railing and handrails on a deck that’s less than 30 inches from the ground. However, consider adding them regardless. Railings provide additional safety for you and your guests who use your deck—plus, railings give the deck a more finished look than it would have without them.

While you can use various materials like sand or even just soil, gravel is widely considered the best option to put under a deck. It provides excellent drainage and is resistant to water, fire, and pests. Gravel also helps anchor the soil to prevent erosion during heavy rain and acts as a built-in weed blocker, reducing regular upkeep. Furthermore, it is simple to spread, available in various textures and tones, and adds a polished look that complements any deck design.