# Free Roof Area

The "Free Roof Area" function is used to enter the roof area that belongs to a previously entered roof contour polygon.

When the "Free Roof Area" function is selected, a roof contour polygon must be chosen first. This can be done either in the XoY view or in any other view.\
After selecting the roof contour polygon, a dialog box opens in which the values for the roof area can be entered. Depending on the values entered in the dialog box, different functions for generating the roof area can be selected.

It is also possible to select roof contour polygons that already have a roof area. In this case, the existing roof area remains in place until the new roof area is generated. It is therefore possible, for example, to use points of the old roof area when determining points for the new roof area.
