Building paper means any paper that is used for insulation purposes. This is used between the floors of any building, along with the roofs, and the walls.
Building paper is also known as a house wrap. This is paper of a fibrous and strong nature, with the abilities to block the entry of moisture and water from the exterior environment. It also enables the passage of moist air through the interior, combating developing moisture within the walls, that otherwise leads to mold formation as well.
This type of building paper is used in several real estate projects or houses for securing the floors and walls with insulating attributes, along with the roofs. This is one of the construction techniques used in the industry.