Forensic Illustration: Birdcage Leak
Client Marketing Demo / 2010
Media Sketchup, Photoshop, iMovie
Project Create animated diagram to illustrate progress of water leaking through Concrete Masonry Unit (CMU) wall during a wind driven rain storm.
The main stairwell of this building is nicknamed "The Birdcage" because the street facing facade is comprised of a mesh covered open steel structure. This design creates a light filled, airy space, but also gets rather wet during wind-driven rain storms. One exceptionally heavy storm in 2008 caused leaks in some odd places. This investigation focuses on how water is getting through the CMU walls, and will be a useful resource in planning future corrective action.
The slides below give a clue to what is happening. Or have a look at the full-size animation for the complete picture.
3d model of lobby stair next to a section of the building affected by leaks
Exterior of CMU wall that separates stairwell from office spaces
Water pooling on floor of 3rd floor office space
Diagram showing how water can soak a CMU wall in a covered space
Cutaway diagram of interior wall, showing path of water into office