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Yes, it is common for mold to grow on the underside of the siding due to the moist atmosphere. When there is an abundance of moisture, mold has the ideal environment to spread and thrive. This fungus can be found on virtually any surface, both indoors and outdoors. Generally, it is most active when the environment is warm, damp, and humid.

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.

Choosing siding combinations that look good together comes down to finding textures and colors that complement each other. You want some contrast so that your home doesn’t look boring or too uniform, but you also want the materials to play off of each other so that each makes the other stand out. It’s a good idea to hire a siding professional to create 3D renderings for you so you can get a sense of what your home will look and feel like before you get started.

Different types of siding provide unique aesthetic and structural features, with each material commanding its own cost. Availability of materials and shipping costs also factors largely into the cost. The common types of siding materials include:

• Stucco: $7–$9 per square foot

• Wood: $1–$15 per square foot

• Engineered wood: $1–$6 per square foot

• Aluminum: $3–$6 per square foot

• Fiber cement: $5–$14 per square foot

• Brick: $10–$20 per square foot

• Brick veneer: $3–$10 per square foot

• Stone: $7–$30 per square foot

• Stone veneer: $5–$11 per square foot