Abstract: A screwless window fastening system has a frame having an exterior surface, an interior surface, and a peripheral wall extending between the exterior and interior surfaces. The peripheral wall has an inward facing surface forming a window opening for receiving a window assembly through the exterior surface. At least one window clip has a window frame receiving channel and is attachable to a window frame of a window with the window frame disposed in the window channel to form an assembly that is insertable into the window opening. And when the assembly is inserted into the window opening, the at least one window clip engages with the frame to prevent withdrawal of the assembly from the window opening.

Abstract: A window buck having frame members forming a frame having an opening for receiving a window. The frame members are constructed to enable use of the window buck in the construction of poured walls, block walls and framed walls. The frame members are milled from stock material according to specific specifications and are delivered assembled to the construction site ready to be placed in a wall under construction. A removable structural web is inserted into the opening and attached to the frame to provide structural support during transport and during wall construction. The particular construction of the frame members provides the window buck with an integral sill pan and improves waterproofing of the window construction.