COLUMN BUILDING SCIENCES FIGURE 4 (LEFT) Exterior Sheathing Air Barrier. Turning the sheathing itself into both the water control layer and air control layer. PHOTO 13 (TOP) Sheathing Water and Air Control Layer. The sheathing in this system is pre-coated with a water control layer. Tape is used to provide water control and air control layer continuity. FIGURE 5 (RIGHT) Insulating Sheathing Air Barrier. Adding the function of thermal control to the sheathing in addition to water control and air control. PHOTO 14 (BOTTOM) Insulating Sheathing Water and Air Control Layer. The insulating sheathing provides three functions in this approach: water control, air control and thermal control. COMPREHENSIVE COVERAGE OF DISTRICT HEATING AND COOLING SYSTEM DESIGN AVAILABLE NOW Price: $179 ($152 ASHRAE Member) www.ashrae.org/districtguide www.info.hotims.com/54426-7 54 ASHRAE JOURNAL ashrae.org MARCH 2015 www.info.hotims.com/54426-60