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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.

While almost nothing is completely fireproof, metal siding is extremely fire-resistant. It’s non-combustible so while it may eventually melt in extreme temperatures, it won’t actually light on fire itself. This can add a layer of safety to structures that wood or vinyl siding can’t, making it attractive for industrial use. Metal siding can significantly slow down the spread of a fire, giving extinguishers and firefighters a much better chance at saving the structure and containing the blaze. 

You should restain or refinish your home's cedar siding every three to seven years to maintain its appearance and ensure maximum protection. The precise frequency depends on several factors, including your local climate, the siding's exposure to severe weather like direct sunlight, rain, and wind, the quality of the initial stain application, the type of stain used, and the condition of the wood.

Homeowners in harsh climates with high humidity and significant direct sunlight should plan on restaining every three years, while those in milder locations can wait up to seven years. For the longest-lasting protection in particularly harsh environments, consider using an opaque stain.

If you're looking for a lower-maintenance alternative, vinyl or aluminum siding are options to consider. Although their installation cost may be higher, they don't require as much upkeep over time, which can provide more value, especially in areas with excessive rainfall or high humidity.

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.