Foundation window assembly and method for installing a foundation window frame into a foundation wall

A foundation window assembly for a foundation wall, the foundation window assembly comprising:

• a window frame comprising:
• a plurality of frame members, and
• at least one casing connector extending from at least one of said plurality of frame members;
• and
• a window casing integrable to the foundation wall upon building thereof, the window casing comprising:
• a plurality of casing members defining together a frame-receiving opening, wherein at least one of said plurality of casing members defines a frame-abutting shoulder and comprises:
• a casing flange portion, and
• a frame-engaging portion,
• wherein the casing flange portion and the frame-engaging portion at least partially delimit together the frame-abutting shoulder;
• wherein a frame-engaging recess is formed in the frame-engaging portion, the frame-engaging recess at least partially circumscribing the frame-receiving opening, said at least one casing connector being removably engageable into the frame-engaging recess when the window frame is inserted into the frame-receiving opening;
• wherein the plurality of frame members each have a frame thickness and define together a window frame perimeter, at least one of said plurality of frame members comprising a window-supporting portion forming at least partially the window frame perimeter and an outer flange portion projecting from said window-supporting portion and having an inner face, wherein said at least one casing connector extends inwardly from the inner face of the outer flange portion of said at least one of said plurality of frame members along at least portion of the frame thickness thereof and is removably engageable into the frame-engaging recess when the window frame is inserted into the frame-receiving opening and wherein the casing flange portion has an outer face, the outer flange portion having an outer face configured to be substantially in a same plane as the outer face of the casing flange portion when the window frame is at least partially inserted into the frame-receiving opening.