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The main differences between dutch lap versus clapboard siding have to do with their design and texture. Clapboard siding features flat, beveled planks stacked at a slight angle, offering a simple, traditional look. Dutch lap siding features a subtly concave surface along with a notch that creates a shadowed look between the boards. This eye-catching design often resembles wood grain and introduces a noticeable shadow line, making it more visually interesting compared to the simpler look of clapboard siding.

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.

Hardie board is more expensive than vinyl siding. Vinyl siding costs $3 to $12 per square foot, on average, with cost skewing toward the lower end of that range. Hardie board siding costs $7 to $18 per square foot, depending on the style, color, and trim. However, it lasts twice as long and often looks nicer, meaning you’ll see a higher bump in your home value and greater curb appeal from Hardie board.

You cannot install clapboard siding on a bare, unprepared surface. Clapboard siding requires a clean, sturdy base made from plywood or similar materials, sometimes called backerboard. Then, it needs an underlayment or sheathing, a moisture membrane to help protect the exterior wall.

Note that sometimes clapboard siding is caulked as it’s installed for additional protection. We don’t suggest this: Caulking the siding can trap moisture inside the clapboards and lead to moisture damage over time. The siding needs some space to “breathe,” especially in rainy weather.