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Yes, you can shou sugi ban existing siding, but it might pose a hazard to wooden structures, shouldn’t involve treated wood, and must be done by a siding professional. You can not char wood on a house without first removing the boards, so it’s a more complicated replacement project than other siding types.

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.

Professional installers typically recommend caulking between siding boards, but it depends on the material. With Hardie board and fiber cement siding, manufacturers don't recommend adding caulk because it can trap moisture in the joints or discourage flexibility in fluctuating temperatures. Consult your local siding contractor about caulking best practices before adding any to your home’s exterior.

Consider your home's architectural style, neighborhood guidelines, and the vendor's options. Samples and software previews can help visualize the final result.