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It is definitely worth sanding a deck to ensure the wood absorbs new stain. Sanding a deck removes the outer layers of aging wood, allowing the stain to penetrate. It also gives a fresh look to the entire surface as part of the deck refinishing process. Without sanding, your stain or sealant is less likely to absorb into the wood. While sanding a deck is a time-intensive project, the rewards are noticeable and long-lasting.

How long deck boards last largely depends on the type of wood and if it's treated or not. Untreated boards last anywhere from ten to 30 years, assuming proper care and maintenance. Treated boards can last up to 50 years. Composite boards also tend to last longer than pure wood boards.

Typically, most residential wooden decks are designed to support approximately 40 pounds per square foot, including the deck’s weight and any items placed on it. While this is fine for typical use, it is usually not enough to hold the weight of a hot tub filled with water and people. To safely support a hot tub, your wood deck will likely require reinforcement. Therefore, it’s best to have a contractor or a structural engineer assess it before hot tub installation.

Often, cracked deck boards are just an aesthetic problem and do not need replacement. However, longer or deeper cracks may be a problem, especially if they are on the end of the board. You can fill minor cracks with caulk, epoxy, or sealant to prevent further damage and improve their appearance. Replace boards with more serious cracks, which could become a safety hazard.