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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.

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.

Yes, vinyl siding can be installed over existing materials in some cases, assuming the underlying structure is sound and the installation will not cause moisture issues.

The cost to install or replace brick or stone siding generally ranges from $10 to $50 per square foot. The final price depends on several factors, including the specific material type, local labor rates, and any necessary preparation work, such as removing old siding. For example, different types of stone have varying costs per square foot: natural stone ($4.50–$35), stone veneer ($11–$13), faux stone ($6–$9), and cultured or manufactured stone ($5–$8).