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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.

Similar to other types of wood siding consisting of natural materials, cedar siding should last 20 to 40 years. However, the lifespan for any wood siding, including cedar, can be far shorter without the proper repair and maintenance work. Don’t put off making repairs, or problems could worsen quickly. While you can repair minor holes and cracks in the siding shakes, rot and warping requires replacing the boards. 

You may only need to repaint fiber cement siding every decade or so, but you should clean it every six to 12 months, depending on your local climate. First, wash with a garden hose or similar low-pressure device (not a high-pressure washer, which can damage the material) to remove dirt and any large debris. Then, gently wipe down the surface with a soft brush or cloth in a side-to-side motion, following the grain of the fiber cement.

You can calculate the required square footage of siding you need by measuring the height and width of your home’s rectangular exterior walls. For the triangular-shaped gable walls, measure the height from the ground to the tallest gable point to make sure you have enough for good coverage. Once you have combined the totals for each wall, add another 10% to account for wasted materials. It’s also good to have extra siding on hand to tackle wood siding repair down the road.