In modern buildings, there tends to be moderate tolerance for design/construction errors affecting thermal performance, air leakage, and moisture migration. This is primarily due to the typically low interior moisture levels found in these types of projects and seasonal variation in exterior conditions.
Moisture presence in concrete slabs can cause problems for all types of floors, including carpeting, wood, stone, poured polymeric, and resilient finish. Too much moisture can cause floorcoverings to cup, buckle, blister, and discolor, and these problems can occur days, months, or years after installation.
Construction is underway on the Hilton Garden Inn, a 12-story high-rise on the University of Iowa campus. The team working on this 5110-m2 (55,000-sf) steel-framed hotel—including Cities Edge Architects and contractor Rushton Sheet Metal—has found a strong solution to the project’s variety of insulation-related challenges.
During a visit to review curtain wall assemblies on a project under construction, we noticed something unrelated—brick ties supporting a cantilevered through-wall flashing drip plate at a window opening in the exterior masonry. This unusual condition invited further examination of the cavity wall construction.