Patent ID: 8020351

Claim:
A method of retrofitting a first basement window in a building with a second window wherein the second window has a greater surface area than the first window, the method comprising: removing a smaller first window from a opening in a foundation wall while leaving a window buck in place; enlarging the opening by cuffing out a bottom side of the window buck and a portion of the foundation below the opening to create a larger opening but leaving a top side and at least substantial portions of the left and right sides of the window buck in place; installing a structural frame in and around the larger opening, the structural frame comprising L-channel and having left, right, top and bottom sides, a first leg of the L-channel of each side forming collectively forming a flange portion with the other sides, the flange portion having a substantially planar back surface, the second leg of the L-channel of each side extending orthogonally away from an inside edge of the first leg; and installing a larger second window in the larger opening.