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Fiber cement siding is the best siding to install over stucco because it offers many of the same benefits for homes where stucco is common, including fire resistance, insect resistance, and good insulation. Fiber cement siding is also rigid, so it won’t warp over time like vinyl siding might if installed over furring strips.

You can put new siding over clapboards, but it’s not recommended. Some sidings, like vinyl siding, can go over clapboards with sheathing like a foam layer in between. However, it’s best to remove clapboard siding if you plan on replacing it with new siding. Burying wood clapboards underneath new siding can create risks of rot and mold, or hidden insect damage. It can also create warping issues over time. Removing clapboards allows you to properly install a new sheathing, as well as clean up the exterior wall and look for any signs of damage.

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.

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.