Abstract: The covering for a window has a pair of base and top or cap frame strips having complementary shaped engaging surfaces including longitudinally extending ribs and grooves, and where the base frame strip is adapted to be secured to a window frame casing or wall surface and such strip has a series of sharp pointed devices carried thereby and extending upwardly therefrom less than the thickness of the top frame strip so that a plastic sheet can be impaled on the sharp pointed devices and means secure the frame strips together and to the window frame in such a manner that the plastic sheet is in sealed engagement with and between the frame strips.