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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.

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).

You can put new siding over clapboards, but it’s not recommended. Some sidings, like vinyl siding, can go over clapboards with sheathing like a foam layer in between. However, it’s best to remove clapboard siding if you plan on replacing it with new siding. Burying wood clapboards underneath new siding can create risks of rot and mold, or hidden insect damage. It can also create warping issues over time. Removing clapboards allows you to properly install a new sheathing, as well as clean up the exterior wall and look for any signs of damage.

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.