What is the purpose of using building paper in residential construction?

Using building paper in residential construction primarily serves as a moisture barrier. This material is typically installed between the exterior sheathing and the siding of a building. Its main function is to prevent water from penetrating the walls while allowing water vapor to escape, thereby helping to mitigate issues like mold, rot, and structural damage caused by trapped moisture.

By effectively managing moisture, building paper plays a crucial role in maintaining the integrity of the building's structure and contributing to the overall durability of the construction. While insulation, aesthetic appeal, and the enhancement of structural strength are important considerations in building design, they are not the primary functions of building paper.