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Avoid toxic chemicals that can leach into nearby lawns, as well as household ingredients like vinegar that can ruin paint and sealants. Instead, look for a very light detergent or a dedicated exterior siding cleaner. In a pinch, you can use a basic dish or laundry soap, but we suggest sticking with a dedicated cleaner.

If your siding is struggling with algae or moss, which indicates moisture issues, look for an outdoor cleaner that’s specifically designed to clear moss and algae stains. This is also a sign that you need to seal your clapboard against further problems.

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.

A square of siding refers to 100 square feet of siding materials. Rather than sell by the individual square foot, manufacturers typically sell siding materials by the square. For instance, if you need 105 square feet of siding but the material is sold in squares, you’ll need to purchase two squares (200 square feet).

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.