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Many people remove aluminum siding to get to the wood underneath, allowing them to paint, stain, or finish the wood to give the home a brand-new aesthetic. With that in mind, you find plywood and related types of wood underneath aluminum siding, but you also run into fiber cement board, strand board, and a diverse array of other building materials. It depends on the original design of the house. 

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.

Clapboard is considered to be eco-friendly, as it is mostly sourced from sustainable natural resources and it has insulating properties. Clapboard is more sustainable than vinyl siding materials, which are made of plastic. Clapboard made from fiber cement can also be considered environmentally friendly. This material mimics the look of wood without the impact of deforestation.

You should plan to stain or refinish your home's cedar siding every three to seven years to maintain its appearance and provide maximum protection, though some estimates suggest a range of four to six years. The exact frequency depends on several factors, including your local climate, exposure to severe weather like direct sunlight, rain, and wind, the quality of the initial stain application, the type of stain used, and the overall condition and quality of the wood.

For homes in harsh climates with high humidity and significant sun exposure, you should plan on staining as often as every three years, while those in milder locations may only need to do so every seven years. For the longest-lasting protection in particularly harsh climates, consider using an opaque stain.

If you are looking for a lower-maintenance alternative, you might consider vinyl or aluminum siding. While the initial installation cost can be higher, they do not require as much upkeep and can offer more value over time, especially in areas with excessive rainfall or high humidity.