When you study the blueprint of the floorplan, pretend that you are walking through the actual house. This technique helps you transform the data and symbols into something more real. A good place to start is at the entryway. From there, you can clearly see the overall organization of the home's interior. They appear as if open with a thinner, curving line showing the space required for them to close.
French doors have two straight and two curved lines.
Two overlapping sets of straight lines is the symbol for sliding glass doors. Parallel solid lines within walls are windows. Like doors, overlapping lines indicate sliding window units. As you study the placement of windows and doors, you can determine if they will permit good ventilation and natural lighting of the interior, as well as make the most of exterior views and provide sufficient access to the outdoors. On the blueprints of a two-story house, you will encounter a staircase, revealed by a group of parallel lines.