Abstract: The combination of a gutter piece and a gauging apparatus. The gutter piece has a length, a front, a rear, a bottom and a top. The gutter piece has an upwardly opening “U” shape, as viewed in cross-section taken transversely to the length of the gutter piece, for accumulating water and guiding accumulated water in a lengthwise direction. The gauging apparatus is operatively attached to the gutter piece and has a front and rear and a projecting portion to abut a surface on a structure to which the gutter piece is attached so as to thereby allow the gutter piece to be consistently aligned with the structure in a direction lengthwise of the gutter piece.