University Hall, designed by Welton Becket and Associates and constructed in 1959, is a large concrete-frame high-rise building that houses administrative offices for the University of California, Berkeley. The structure is composed of a seven-story tower and an adjoining two-story annex.
UC Berkeley selected Interactive Resources to perform a study and make recommendations for envelope improvements for University Hall, with an emphasis on roof replacement, penthouse wall coating, water intrusion mitigation at the windows, and improving drainage and watertightness of the annex patio. This study was used as a basis for the envelope improvement project, intended to reduce maintenance requirements, save energy, and improve functionality and appearance of the roofing and related exterior elements.
The existing roofing materials consist of a modified bitumen torch-down system at the main tower roof, and built-up roofing with an aggregate surface at the penthouse and annex roofs; all roof systems appear in excess of 20 years old. The stucco penthouse walls are coated with a delaminating elastomeric coating. The original single-glazed anodized aluminum fenestration system includes operable windows; sealants appear aged and present hairline gaps at some locations observed. Poor drainage and waterproofing had resulted in water penetration into rooms adjoining a patio at the annex.
The base scope of work included: complete roof replacement with a polyvinyl-chloride (PVC) single ply roofing system, recoating the penthouse walls, partially upgrading the most weather-exposed windows, providing a new sloped substrate and deck coating system at the annex patio.