The Surface Hatch Linework component draws all linework coming from surface hatches of the objects cut. Surface hatches appear in faces of the section object that are not cut by the section line. This component is specific to 2D sections.
Note: Surface hatches that you have assigned to objects will display in a 3D section object. However, you cannot set them separately in a 3D section; you can do that only in a 2D section object.
The surface hatch linework component is controlled by the surface hatch component of the material.
2D section with roof surface hatch