The present invention is a thin profile prefabricated reinforced plastic fence. A preferred embodiment of the fence comprises a top rail having a bottom side with a plurality of picket apertures and a bottom rail having a top side with a plurality of member apertures. The bottom rail preferably contains a horizontal strengthening member and supports the top rail by way of vertical pickets. Each picket sheaths a strengthening member that is slideable inside the picket. The top of each picket is inserted into the picket apertures of the top rail and the strengthening member extends from the bottom of each picket into the member aperture of the bottom rail. The bottom of each picket rests upon the top side of the bottom rail. The fence ends have a first post and second post to which the top and bottom rails are fastened.