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Yes, siding orientation can affect a home’s resale value, but in what way and by how much really depends on the prospective buyer. For instance, some buyers prefer the more modern appearance that vertical siding offers, so having it can increase your home’s value in their eyes. However, other buyers prefer the classic, more common appearance of horizontal siding, so having vertical siding can decrease your home’s value in their eyes. 

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 cost of wood siding varies by the type of wood. Engineered wood siding tends to be in the middle of typical costs ($3 to $7 per square foot for materials). Hardwoods, for instance, can cost $5 to $20 per square foot for materials alone, but cedar wood can be as cheap as $3 per square foot.

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.