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The clapboard exposure, also called the reveal, refers to the amount of clapboard visible in the siding. Clapboards always overlap slightly, but some overlap more than others. The exposure is the vertical measurement of the board that remains visible as the clapboard is installed.

When repairing clapboard siding, it’s important that you match the exposure of your current clapboards. You may want to take a measurement of the specific exposure on your siding for reference in repairs.

Mildew grows into porous wood, making it more difficult to remove than regular dirt (and more destructive). We suggest using a dedicated mildew and mold fungicide to remove mildew, which is found in any local home improvement store. Apply a dose of the fungicide to the siding and leave to work according to the instructions, usually for an hour or two. Then wash it thoroughly away and scrub the spot again. Repeat the process if necessary. If nothing is removing the mildew stains, you should plan on removing those clapboard planks in time, as their damage could cause future problems.

On it own, aluminum siding has a relatively low insulation value (also called R-value); aluminum siding has an R-value of 0.61. However, you can purchase insulated aluminum siding to increase the R-value to between 2 and 5. You can also install additional insulation within your walls to help maintain temperatures within your home. On average, insulation costs $1,825 to install throughout the typical home.

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