Subtopic 4.1103 Enclosed Walls

Consistent, uniform thermal boundary Thermal boundary The separation between the interior and exterior environments of a building that slows heat flow between conditioned and unconditioned space to prescribed R-value of an adjoining insulated assembly

Properly installed insulation reduces heat flow through walls and framing cavities inaccessible to other treatments

Properly installed insulated wall sheathing and insulated siding

Maintain a consistent, uniform thermal and weather-resistant boundary between conditioned and unconditioned space to prescribed R-value of an adjoining insulated assembly

Complete and continuous thermal air barrier Air barrier The separation between the interior and exterior environments of a building that slows air flow to the point that no smoke movement is visible at 50 pascals of pressure difference across the boundary around the exterior of the building to minimize thermal bridging