Yes. The only time you can't install fiber cement siding over wood is if the wood is painted or covered with a non-breathable finish, like vinyl or aluminum. In that case, you would have to remove the paint or finish before installing the fiber cement.
Yes. Fiber cement siding can be installed over wood siding, but it's not recommended. The main reason it's not recommended to install fiber cement siding over wood siding is because moisture can get trapped between the two materials, which can cause the wood to rot. In addition, if there is any damage to the fiber cement siding, it will be difficult or impossible to repair because you'll have to remove the entire layer of siding in order to get to the damaged section.
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