COLUMN BUILDING SCIENCES insulation or the exterior face of the continuous insulation. Now for the "pain" part-the windows. Are they going to be "innies" or "outies"? Who talks like this? Welcome to my world. Are the windows going to be "inset" or are they going to be outboard of the structure at the exterior face of the continuous insulation? If the windows are "inset" and the water and air control layer is behind the continuous insulation everything is real easy-things "line up." If the windows are "outset"§ and the water and control layer is the face of the continuous insulation things are also real easy-things also "line up." But if the windows are outset and the water and control layer is behind the continuous insulation things get more complicated. Let's go with the easy stuff first. "Innies" with the water and air control layer being the sheathing behind the continuous insulation. Check out the sequence of installation (Figure 3). Note that the water control of the flanged window lines up with the water control of the sheathing. Note the sloping sill. Note that the pan flashing can be liquid applied or a formable membrane. Note that sealant is not necessary (or desirable) behind the window flanges. For an explanation see "Stuck on You," ASHRAE Journal, February 2013. Note that the seams in the continuous insulation do not need to be sealed or taped. And here's a real neat point- the continuous insulation does FIGURE 1 (TOP) Structural Sheathing as the Water and Air Control Layer. Continuous insulation is installed over the structural sheathing. FIGURE 2 (BOTTOM) Continuous Insulation as the Water and Air Control Layer. Include or exclude the structural sheathing based on structural considerations. § Pretty sure this is not what Webster's had in mind for the meaning of "outset." But what the heck, I have been making things up for years. I coined the phrase "drainage plane" because I needed rhymes that would help architects and consultants understand water control: "you need to drain the rain on the plane" and "don't be a dope, slope." APRI L 2015 ashrae.org ASHRAE JOURNAL 57