Abstract: A method and apparatus adapted to insulate a buck of a wall of a dwelling such as a house. The method of the present invention includes placing an elongated, generally rigid insulating member having a height of about 92 and 5/8 inches, a width of about 3.5 inches and a depth of about 2 inches within a buck of a wall while the wall is under construction. The buck itself is formed by fixedly securing a pair of 2.times.4 inch studs on opposite side portions of a third 2.times.4 inch stud, to thereby place inner surfaces of the 2.times.4 inch studs about 3.5 inches apart. A third 2.times.4 inch stud is positioned such that an outer surface thereof is substantially flush with rearward edge surfaces of the pair of 2.times.4 inch studs, to thereby form an elongated cavity having a width of about 3.5 inches and a depth of about 2 inches, the cavity representing the buck.