When new flooring is installed in a room with a sliding patio door, there can be a problem if the installers do not provide an “expansion gap” adjacent to the door track.  This thin gap should run the entire length of the door track and is often concealed by a thin strip of matching trim, such as a quarter round. This gap is to allow for the seasonal expansion and contraction of the flooring.  But, if the installers do not make provisions for such a gap, the flooring will force