Issue link: https://hi.iaq.net/i/248503
www.epa.gov/iaq/moisture • The window jamb, sash and glazing system provide insulation continuity to the rough opening at the bottom of the window, which is insulated with canned foam. Insulation Layer Continuity To demonstrate a continuous layer of insulating material around a section, place the pen tip on the insulating layer in the center of the roof and trace from one insulating material to the next around to either the bottom of the foundation wall or the center of the foundation floor. • The exterior insulating foam sheathing and cavity insulation carry the insulation layer to the foundation. • Foam sill seal provides thermal insulation between the bottom of the wall and the concrete foundation, which carries thermal protection below grade to the bottom of the foundation wall. Figure A-2 shows the continuity of thermal insulation in a sample section. • Beginning at the center of the roof, trace through foam insulation to the edge of the roof. • Vertical foam insulation applied to the interior of the foundation wall. • One- or two-part polyurethane foam insulation applied in the field fills the top and bottom voids created by the fluted steel deck, providing both insulation and air barrier continuity. Air Barrier Continuity Continuity of the air barrier is demonstrated using the same method used for rainwater control and the insulation layer. Air barrier materials and the sealants used to connect them are identified from the center of the roof to the center of the foundation floor. • The field-applied foam connects to the top of the exterior foam insulation sheathing and the top channel of steel wall framing. • The steel wall framing is filled with cavity insulation, and the thermal bridge through the steel is insulated by the exterior foam insulation. In this case foam insulation on the roof and walls, windows and the concrete floor slab forms the basis of the air barrier. The insulation components are connected with sealants (e.g., field-applied canned foam) and gasket-like materials (e.g., foam sill seal). • The rough opening between the exterior foam sheathing and the window jamb is insulated (and air sealed) with field-applied canned foam insulation. A-5