What if building your own custom home was as simple as pressing "Print" on your computer? Science fiction fantasy? Not if Dr. Behrokh Khoshnevis from my alma mater, USC, has anything to say about it. He's pioneering a new construction method called Contour Crafting. Here's how the New Scientist article describes it:
It takes instructions directly from an architect's computerised drawings and then squirts successive layers of concrete on top of one other to build up vertical walls and domed roofs. The precision automaton...can work round the clock, in darkness and without tea breaks. It needs only power and a constant feed of semi-liquid construction material. The key to the technology is a computer-guided nozzle that deposits a line of wet concrete, like toothpaste being squeezed onto a table. Two trowels attached to the nozzle then move to shape the deposit. The robot repeats its journey many times to raise the height and builds hollow walls before returning to fill them.
"The goal is to be able to completely construct a one-story, 2000-square foot home on site, in one day and without using human hands," says Khoshnevis. The robot can install plumbing and wiring as it goes, but can't do windows -- yet.
Khoshnevis's prototype robot hangs from a movable overhead gantry, like the cranes at ship container depots. Khoshnevis speculates that they could also be ground-based, running along rails and able to build several houses at one time.
Not only will the homes go up faster, but more beautifully as well. According to Venice architect, Greg Lynn, ""I'm convinced this will allow you to make beautiful, innovative and as yet unimagined kinds of houses." Unconstrained by 2x4's, the technique will allow for complex curving walls and dramatic domed ceilings. I'm thinking about a funky mix of Taj Mahal, Walt Disney Concert Hall, and old school Mongolian yurt for my dream house.
The technology's speed and cost also makes it perfect for emergency housing in cases of earthquakes or war, low income housing, and even space colonies. Imagine future space colonists reading the directions: "Mix one part moon dust with one part water and stir..."
The construction industry has been a laggard in the productivity miracles that have already remade agriculture, manufacturing, and services. Looks like that won't last long.