Structural Garage Floors
A large number of new homes in my area are being constructed with structural floors (ie the full size of the garage is added to the basement below). I believe they are also called suspended garage floors. This is becoming very popular. Typically metal forms (looks similar to corregated sheet metal but much thicker)are set on the support beams and the concrete and steel placed above that. The cost per sqare foot is incredibly low - somewhere around $10 per square foot for added room to the basement and/or more garage room if you have a walkout. I have a walkout basement and will add a garage door opening to the back underneath the main garage. In essence, my 3 car garage will become a 6 car garage and I won't need to construct a costly out-building.
Question - I've heard pre-cast, pre-stressed concrete beams (with a thin concrete surfacing layer) are also being used instead of the corugated steel. Does anyone have any experience with either? What are the pros cons to each? I want the biggest span possible in the area beneath - just curious what others have.