Column Building ScienceS With the jumbo sized buildings you just start on one side and work your way around. First the fluidapplied water control layer and air control layer and the 2×4 wood furring (Photo 7). Then you layer in the rigid insulation (Photo 8). Then the cladding. In this case fiber cement panels (Photos 9, 10 and 11). The big remaining question involves the windows. Are they "innies" or "outies." The physics calls for "outies" and that is the way that I push hard for (Figure 4). But lots of folks like the look of "innies" (Photo 12). With "outies" the thermal control layer of the wall easily lines up with the thermal control layer of the Photo 9 Fiber Cement Panels. Fireproof and pretty robust. Photo 7 Jumbo Sequencing. With the jumbo-sized buildings you just start on one side and work your way around. First the fluid-applied water control layer and air control layer and the 2×4 wood furring. windows. With "innies" this is not the case unless you make the window opening smaller. That reduces Photo 10 More Fiber Cement Panels. Note the "innie" windows. I don't always win. Photo 8 Next Step. Add the rigid insulation. Layer it between the furring and then over the entire kit and caboodle in continuous layers. glazing area. Good luck with that argument. The best argument for "innies" is that the existing windows Photo 11 Scupper Detail. You have to drain the roof. Cladding Furring Masonry Wall Fluid-Applied Water Control Layer and Air Control Layer Sloping Head Piece Tape Window Head Plywood Extension Box Beveled Sill as Backdam Sill Flashing Cladding 2×4 Wood Furring Mechanically Attached to Masonry Wall Jamb Flashing 1×4 Wood Furring Attached through Rigid Insulation to 2×4 Wood Furring Figure 4 "Outies." The physics calls for "outies." With "outies" the thermal control layer of the wall easily lines up with the thermal control layer of the windows. 42 ASHRAE JouRnAl ashrae.org Au g ust 2014 Photo 12 "Innie" Window. The best argument for "innies" is that the existing windows are good enough not to be replaced as part of the retrofit. If you are replacing the existing windows with new high performance windows the best option is an "outie."