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Insulated vinyl siding is very durable and can last for 20 to 40 years. The extra support that the insulation provides helps to make the vinyl siding less susceptible to damages from weather and other minor wear and tear. Vinyl siding on its own may  be less durable than other types of siding like fiber cement, but when coupled with insulation it is stronger than usual.

Avoid toxic chemicals that can leach into nearby lawns, as well as household ingredients like vinegar that can ruin paint and sealants. Instead, look for a very light detergent or a dedicated exterior siding cleaner. In a pinch, you can use a basic dish or laundry soap, but we suggest sticking with a dedicated cleaner.

If your siding is struggling with algae or moss, which indicates moisture issues, look for an outdoor cleaner that’s specifically designed to clear moss and algae stains. This is also a sign that you need to seal your clapboard against further problems.

If you buy new cedar, the process of cutting it usually roughs up the surface enough that it doesn’t require sanding. However, if you buy older cedar or you’re repurposing it from another application, it’s a good idea to sand it. This helps the stain settle into the grain, and results in a more uniform appearance.

Traditionally, you place a layer of ⅜-inch foam board beneath aluminum siding. This gives you a smooth surface to which you can fasten the trim and siding. Beneath the foam board, you should have some kind of waterproof sheathing to further protect your home from water damage. It’s possible this sheathing is already under your current siding.