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Wood clapboard siding needs frequent sealing to keep it in top condition—likely every two to three years. A sealant helps protect it from both moisture and sunlight damage. Your weather and climate will affect how often you need to seal the siding, but the pros recommend sealing it every couple of years. More durable woods in milder climates may not need to be sealed quite as often.

Clapboard siding is traditionally made of wood, and is one of the most common types of wood siding in North America. When people talk about wood siding, they are usually talking about clapboard siding. However, not all wood siding is in the clapboard style: It can be tongue-and-groove, shake, and other designs. Also, clapboard siding can sometimes be made of different materials, like vinyl or fiber cement, so the terms are not interchangeable.

You should plan to stain or refinish your home's cedar siding every three to seven years to maintain its appearance and provide maximum protection, though some estimates suggest a range of four to six years. The exact frequency depends on several factors, including your local climate, exposure to severe weather like direct sunlight, rain, and wind, the quality of the initial stain application, the type of stain used, and the overall condition and quality of the wood.

For homes in harsh climates with high humidity and significant sun exposure, you should plan on staining as often as every three years, while those in milder locations may only need to do so every seven years. For the longest-lasting protection in particularly harsh climates, consider using an opaque stain.

If you are looking for a lower-maintenance alternative, you might consider vinyl or aluminum siding. While the initial installation cost can be higher, they do not require as much upkeep and can offer more value over time, especially in areas with excessive rainfall or high humidity.

Vinyl siding is the cheapest option in terms of upfront costs. The average cost to install vinyl siding is around $12,173, with certain types like vinyl shake, clapboard, or dutch lap costing as little as $2 to $3 per square foot. While vinyl is very low-cost, it may not last as long as natural materials or metal, with a typical lifespan of 20 to 40 years. In contrast, metal siding is more expensive initially but can save you money in the long run due to its longer lifespan, which is often double that of vinyl. It's recommended to consult a siding professional to determine if the lowest-cost option is the best material for your specific home.