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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.

The average cost to replace siding is $10,500, but you should expect to pay an average of $12,000 to install new siding over stucco. The additional cost goes toward assessing the old stucco for damage, any necessary repairs before the new siding goes up, and the materials and labor required to install furring strips over the stucco to attach the new material. Even with this additional cost, installing siding over stucco is often more affordable than removing the stucco and starting over.

Siding underlayment varies based on the type of material, but most siding is installed on top of a vapor barrier, a moisture-resistant house wrap, sheathing made from plywood or oriented strand board (OSB), and a layer of insulation sheeting. Having the correct underlayment is a critical part of properly installing siding and will protect your home from water intrusion, structural damage, and energy loss.

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.