Smiling JOe said:
Of course I am not in the building industry so I do not know. Is this something new? I thought if they built the house to handle the wind load, that hurricane rated 140mph wind resistant windows were not necessary.
The new building code went into effect in the summer of 2003. The code was a result of research done after Hurricane Andrew.
Wind rated windows are part of the new building code and REQUIRED if the house is three or more stories. If a house is three or more stories, all windows and doors in the house on all levels have to be wind rated to 130 mph. A builder may substitute hurricane shutters for the wind rated windows, but it is less expensive and easier to install the windows. This includes glass and frames and the contractor must show proof of wind resistance (provided by the window companies in the form of testing results) in order to pass building inspections.
According to the new building code, a contractor must also provide hurricane window protection for two and one story houses in the form of shutters or plywood and screws that are stored at the homesite.
The wind rated windows are a very important part of making a house wind resistant, but it is to 130 mph, not 140. It would be impossible for a house to handle the wind load without the proper windows. The purpose of the windows (or shutters/plywood) is not to prevent water damage from broken glass. The purpose is to prevent the windows from breaking and causing a pressure drop in the house which can in turn cause the roof to blow off or curtain walls to fail.