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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.

Signs that you need to replace your siding include siding that’s warping, bubbling, or cracking; signs of rot or mold growth; fading, peeling, or chipped siding or paint; or siding that’s separating from the exterior of your house. Failing to replace your siding when it’s damaged can lead to moisture problems or structural damage, so promptly repair or replace siding as soon as you notice any of these signs.

Generally speaking, the thicker the siding, the higher the quality. Thicker siding provides a stronger resistance against extreme weather conditions. Thicker siding also tends to fade more slowly under the sun. Hardie boards, a popular fiber cement siding option, is usually 5/16 inches thick. Meanwhile, masonry-finished cement siding varies from 5/8 to 5/8 inches thick.

Yes, vertical and horizontal siding both come in the same materials, including wood, vinyl, aluminum, and engineered wood. The material you choose can significantly affect your siding’s overall price, lifespan, insulation properties, and maintenance costs.