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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.

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.

Vinyl can withstand many different cleaning methods, but there are two things you need to be wary of. First, particularly harsh chemicals will damage your vinyl siding and reduce its lifespan. Second, be careful about pressure washing your vinyl siding. Vinyl can resist powerful washing damage more than softer siding like wood, but high levels of pressure can still crack it. Use the lowest level of pressure for power washing vinyl, or hire a siding professional to do it.

Pressure washing shou sugi ban siding is generally not a good idea. The charring process used in creating shou sugi ban siding involves burning the wood's surface to achieve its unique appearance and enhanced durability. The charred surface is delicate, and pressure washing can easily damage it. Instead of pressure washing, you can clean it with a soft brush or broom to remove loose debris, followed by a mixture of mild soap and water applied with a soft cloth or sponge.