The eighth edition of Architectural Graphic Standards (AGS), published by The American Institute of Architects (AIA), has several serious flaws in its Chapter 4 on masonry. FLASHING DETAILS Throughout the masonry chapter of AGS, details requiring a flashing membrane are shown with the membrane terminated within the outer wythe of masonry. This practice can cause walls to perform poorly. The flashing membrane should extend beyond the outer face of the wall. PARAPET DETAILS Parapet walls always should be detailed carefully and kept to a minimum height if possible. All parapets shown in AGS details are tall. Some of them have flaws. For example, whenever the book shows metal copings on masonry parapet walls, it fails to mention two critical requirements. First, all metal caps should be watertight. Second, the book doesn't show movement joints or slippage joints in the metal cap. MASONRY MOVEMENT JOINTS AGS's Chapter 4 also falls short in its discussion of control and expansion joints. Although it does a good job of explaining expansion joints, it omits a critical point in its definition of control joints: Control joints should be used only in concrete or concrete masonry, not in brick. The book confuses these two types of joints throughout the section on masonry.