Build Better Walls: Clearing the air on exterior insulation performance
Sponsor: Atlas Roofing
Credits: 1 AIA HSW LU
Complex project designs & evolving enclosure material options combined with demanding weather conditions & confusing product performance attributes can be challenging to synthesize. Because thermal value code targets are increasing, along with the uncertainty of future energy costs & weather patterns, getting the project’s insulation strategy right is critical. This session examines the performance attributes of exterior insulation options under real world conditions to better enable the design & installation of higher performing, more resilient and durable walls.
Learning Objectives:
- Understand current building code requirements and testing methodologies for fire propagation and smoke development. Given assembly testing following the Grenfell tragedy, attendees will better understand NFPA285 fire propagation testing in relation to actual material properties and performance.
- Review material properties governing moisture and air performance as they pertain to conditions encountered in rainscreens and masonry veneers so as to best understand the actual performance characteristics of insulation specification choices.
- Understand conditions that pose unique challenges, including multiple drain planes, drainage efficiencies, increased water absorption, and water vapor transmission. Recognize risks associated with exterior insulation when used in combination with cavity insulation, interior vapor retarders, and low-perm water-resistive barriers.
- Understand the effects of wind-washing and convective heat loss in modern rainscreen systems. Identify and prevent conditions that jeopardize the thermal insulation layer, which may in turn affect moisture transfer and overall wall performance