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Stucco is considered a type of cladding because it includes a built-in ventilation layer, a weatherproof membrane beneath that, and, often, a layer of insulation to improve building efficiency. The multiple layers of stucco—the scratch coat, the brown coat, and the finish coat—also create a more complex building membrane, so it’s more accurate to call it cladding. However, homeowners and contractors alike refer to stucco as siding.

Traditionally, you place a layer of ⅜-inch foam board beneath aluminum siding. This gives you a smooth surface to which you can fasten the trim and siding. Beneath the foam board, you should have some kind of waterproof sheathing to further protect your home from water damage. It’s possible this sheathing is already under your current siding.

Insulated vinyl siding is very durable and can last for 20 to 40 years. The extra support that the insulation provides helps to make the vinyl siding less susceptible to damages from weather and other minor wear and tear. Vinyl siding on its own may  be less durable than other types of siding like fiber cement, but when coupled with insulation it is stronger than usual.

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.