COLUMN BUILDING SCIENCES "pan flashing" for the opening. The window installation now follows the same steps as for the "innie" approach. So which are better? "Innies" or "outies"? And what is the correct location of the water control layer? Depends on whom you ask. And when you ask them. It becomes a Ginger or Mary Ann question. There is usually no wrong answer. But regardless of where you end up, the water control layer of the wall has to connect to the water control layer of the window. PHOTO 3 Strap Window Attachment. Similar to window installation in masonry openings lined with window bucks. Unlike masonry openings the window flanges are retained for water control. FIGURE 7 Structural Box. Note that with the structural box the water control layer is wrapped into the box opening and the material is typically flashing tape. FIGURE 8 Window Installation Sequence for Mineral Fiber Installation (Stone Wool). Note that liquid applied flashing is used to provide continuity with the water control layer on the face of the structural sheathing and the "picture framing" "structural extension." The liquid applied flashing wraps into the frame opening and creates the "pan flashing" for the opening. The window installation now follows the same steps as for the "innie" approach. A B C D E A) Structural sheathing installed over frame wall with opening "picture framed" with 2 × material extending past face of sheathing; B) Install beveled wood siding in frame opening at sill to create slope; C) Install liquid applied flashing wrapping into the frame opening; D) Install window plumb, level and square; E) Install flashing tape at jambs. F G H I J F) Install flashing tape at head; G) Install continuous insulation; H) Interior view prior to window installation; I) Interior view after window installation; J) Air seal window around entire perimeter with sealant and sealant backer rod. 62 ASHRAE JOURNAL ashrae.org APRI L 2015