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Avoid toxic chemicals that can leach into nearby lawns, as well as household ingredients like vinegar that can ruin paint and sealants. Instead, look for a very light detergent or a dedicated exterior siding cleaner. In a pinch, you can use a basic dish or laundry soap, but we suggest sticking with a dedicated cleaner.

If your siding is struggling with algae or moss, which indicates moisture issues, look for an outdoor cleaner that’s specifically designed to clear moss and algae stains. This is also a sign that you need to seal your clapboard against further problems.

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.

Composite siding has excellent insulative properties and one of the highest R-values of siding materials available. Its R-value is 2 to 4; compare that to vinyl, wood, and fiber cement—all of which have R-values under 1. You can boost your siding’s R-value by installing a layer of foam insulation. 

The average cost to install stucco siding on a home is around $5,700, with most homeowners paying between $2,200 and $9,100. However, the total cost can range from $750 to as high as $22,750 depending on several factors. On average, you can expect to pay between $7 and $9 per square foot. Key cost factors include the size and complexity of your home, the desired color and texture, labor and material costs in your area, and whether you have a multi-story home. Specific applications have different costs, such as adding stucco over brick ($7 per square foot) or over wood siding ($8.50 per square foot). To save money, you can consider removing the old siding yourself or scheduling the installation during the off-season.