Window retrofit increases R-value, decreases tenant inconvenience

The basics: The Saint John Properties' Oxford Building in Towson, Md., received a full window renovation from the interior of the building. A triple glazed window retrofit system was used to improve performance of existing windows without inconveniencing existing tenants. The existing windows were improved from an approximate R-value of 1.67 (center of glass) to an R-value of 5.56 (center of glass), according to officials from JE Berkowitz LP.

The players: Glass fabricator, JE Berkowitz LP, Pedricktown, N.J.; retrofit spacer supplier, Edgetech I.G., Cambridge, Ohio; glazing contractor, Anco Glass, Stevensville, Md.; glass manufacturer, PPG Industries, Pittsburgh.

The glass and systems: Renovate by Berkowitz window retrofit system—an insulating glass unit that is sealed to the original single-pane unit with Super Spacer TriSeal, creating a triple-pane system. The project has approximately 7,500 square feet of insulating glass units. The glass makeup consists of 7/8-inch clear over PPG Solarban 60 to create the RbB triple pane system.