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Lumber is typically dried to a specific moisture content before it is used in construction because this process helps to ensure the structural integrity and durability of the wood. Moisture content plays a critical role in the performance of lumber; wood that is too wet can lead to issues such as warping, cracking, or shrinking once it is installed. When lumber is dried, it reaches a moisture content that is appropriate for the environment in which it will be used, usually around 15% for interior applications and lower for exterior. Proper drying also improves the wood's strength and stiffness, making it suitable for carrying loads and providing support in construction.

The other processes mentioned, such as treatment for pests, staining, and painting, are not universally applied to all lumber before construction. Pest treatment can be relevant for certain types of wood or specific applications, but it is not standard for all lumber. Staining and painting are typically finishing processes applied after installation to enhance appearance or provide protection, rather than preparation steps before construction.