In the Gutter To the Editor: "Exterior Trim: Design Basics" (7/95) shows four gutter end treatments that ignore an essential feature of gutter placement: namely, that gutters should be set below the slope, or throw, of the roof so that ice and snow can slide clear. Besides this, I don't recall ever seeing an installation like the one illustrated in Figure 2B, where a small triangular block on top of the rake board covers the gutter end. Can the author provide pictures to demonstrate the illustrations? Stephen E. Zecher, AIA Zecher Associates Cambridge, Mass. Jamie Fisher responds: Your question points up the difference between the climates of Boston and Seattle. In Seattle, which gets only an occasional freeze, we don't spend a