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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.

The recommended PSI (pounds per square inch) for cleaning vinyl siding can vary, so it's best to consult the manufacturer's guidelines. Generally, vinyl siding can handle high pressure, from 2,500 to 3,500 PSI. For comparison, more delicate materials like wood and aluminum siding should not face more than 1,500 PSI. To safely disperse the pressure on vinyl, use a tip with a wider spray span, such as a green (25-degree) or yellow (15-degree) nozzle. For routine cleaning of light dirt, a garden hose with a spray nozzle may be sufficient. Always exercise caution to avoid using excessive pressure that could damage the siding.

To maintain vinyl siding, homeowners should regularly clean it with mild soap and water, inspect for damage, and promptly repair any issues. Avoid using high-pressure washing and keep sharp objects away to prevent scratches. Check for mold or mildew and clean with a mixture of water and mild detergent. Take preventive measures to avoid fading, such as minimizing exposure to direct sunlight and using color-safe cleaning products. With proper maintenance, vinyl siding can retain its appearance for years.

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.