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The clapboard exposure, also called the reveal, refers to the amount of clapboard visible in the siding. Clapboards always overlap slightly, but some overlap more than others. The exposure is the vertical measurement of the board that remains visible as the clapboard is installed.

When repairing clapboard siding, it’s important that you match the exposure of your current clapboards. You may want to take a measurement of the specific exposure on your siding for reference in repairs.

Professional installers typically recommend caulking between siding boards, but it depends on the material. With Hardie board and fiber cement siding, manufacturers don't recommend adding caulk because it can trap moisture in the joints or discourage flexibility in fluctuating temperatures. Consult your local siding contractor about caulking best practices before adding any to your home’s exterior.

You should restain or refinish your home's cedar siding every three to seven years to maintain its appearance and ensure maximum protection. The precise frequency depends on several factors, including your local climate, the siding's exposure to severe weather like direct sunlight, rain, and wind, the quality of the initial stain application, the type of stain used, and the condition of the wood.

Homeowners in harsh climates with high humidity and significant direct sunlight should plan on restaining every three years, while those in milder locations can wait up to seven years. For the longest-lasting protection in particularly harsh environments, consider using an opaque stain.

If you're looking for a lower-maintenance alternative, vinyl or aluminum siding are options to consider. Although their installation cost may be higher, they don't require as much upkeep over time, which can provide more value, especially in areas with excessive rainfall or high humidity.

Though vinyl siding is affordable, the material may not last as long or look as good as other siding materials. For example, wood siding has a beautiful, natural appearance but requires much more maintenance to keep your siding looking as good as new. 

Fiber cement siding is another alternative that mimics the appearance of wood siding. Like vinyl siding, fiber cement is a low-maintenance material, but it does come at a higher price and is heavier and more difficult to install. Weigh the pros and cons of all siding materials before you decide on the best option for your home.