• RDH Building Science

Poured-in-place concrete walls have historically provided an acceptable level of performance in multi-unit residential buildings. This was illustrated through a number of the case studies. Where problems did appear they were isolated and not systemic in nature. However, many of the problems were difficult to fully isolate, and repairs often involve dismantling the wall assembly from the interior. Poured-in-place concrete buildings constructed in the 1970s and 1980s were also simpler in form with fewer interface details. In addition these buildings had higher levels of air leakage than more recent buildings thereby providing ventilation to moderate interior moisture levels.

As poured-in-place concrete wall assemblies are used more often as an element in current new construction this study identifies the reasons why older buildings of similar wall assembly type have performed well. In addition, strategies for design and construction are presented that address changes in newer buildings.