To get the flow of space/ceiling/roof that Schindler achieved, we need to get rid of the header. To do that, we must change the roof framing so it doesn’t need the support of the header (beam) over the door. And to do that, Schindler turned the rafters 90 degrees, so they span from wall to wall.
The turned rafters in the cantilevered section would be floating in air. To support them, beams (in red) are added (Figure 1). The beams extend out (cantilever) beyond the wall below to support the rafters in the cantilevered section. Posts (purple) are added at the corners to help support the weight of the cantilevered beams.
Once the rafters aren’t supported by the wall below (they are supported by the beams and sides walls) this wall can be opened up. A high window (clerestory) can be added-in Schindler’s case this would be a long horizontal window that might extend from corner to corner (Figure 2).
While we are at it, if we extend the cantilever beam all the way back to the rear corner and add another post, the side wall isn’t needed either. We can add another window and clerestory window to the side (Figure 3). This really opens up the corner, an important feature in the Plaster Skin buildings.
Next article: Framing the McAlmon apartment