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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.

Pressure washing is, in fact, one of the few cleaning methods that can damage your fiber cement siding. Though durable, the material cannot withstand high water pressure. Always follow the manufacturer’s instructions and use the appropriate cleaning solution when cleaning If you are dealing with stubborn stains, use a scrub or metal-bristle brush, or leave it to a professional.

When moisture infiltrates your siding, it can result in deterioration and decay of the sheathing, cause structural damage to your foundation, and provides an ideal breeding ground for mold. Mold growth can lead to various health-related problems, such as itchy eyes, sneezing, allergies, and asthma. Mold and dampness commonly attract a wide range of insects, so if your siding has taken any kind of water damage, it could invite some unwelcome guests.

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.