Licensed Architect - Winter 2015 - (Page 38)

Second Chances for Buildings Before After Partial exterior view of building before and after window restoration work. Evaluating Repair Approaches for Historic and Contemporary Window Systems BY TIMOTHY M. CROWE, ALA, SE, PE AND MICHAEL FORD, ALA, AIA indow systems in existing buildings create numerous challenges in the preservation and adaptive reuse of structures, especially when codes and project requirements, such as blast resistance or LEED certification, dictate improvements to energy efficiency and performance of window systems. Often window replacement projects are associated with interior alterations and insulation upgrades which can further complicate window system details. There are many variables which need to be considered when evaluating repair approaches and developing design details for replacement window systems. These include whether to refurbish or replace existing windows, specifications of secondary (storm) and replacement windows systems, foreseeing possible changes to the interior environment 38 | Licensed Architect | Winter 2015 as a result of interior alterations and HVAC modifications, and integration of window system with the wall assembly to reduce air and water infiltration. Also, modifications in the placement of insulation in the wall system can have a significant effect on the thermal performance of the window system depending on its location within the wall. On-site testing, mock-ups, and computer-based modeling are some of the tools which can assist in quantifying the effectiveness of repairs and potentially identifying appropriate specifications for window systems. This article will examine two specific window projects that created technical challenges and are good examples where performance testing, mock-up, and computer-based modeling were used to verify that repair approaches would satisfy energy efficiency and performance criteria. Window Restoration and Reinstallation: The first project is the adaptive reuse of a historic landmark building within a multi-building campus that is being adapted for a different use. The three-story brick masonry building, constructed circa 1870, had been closed off, as part of a temporary stabilization effort, with only moderate ventilation during a 10-year "mothball phase" and was in a fairly dilapidated condition. The building has multi-wythe brick masonry walls, approximately 18 inches thick, with internal cell voids integrated into the construction that create a semihollow wall. Typical window openings are approximately 4 feet wide by 6 feet 4 inches tall. Within each opening are wood-framed multi-light double-hung windows with flat plate glass with the frames recessed approximately 3 inches from the exterior face of the masonry wall. The building was being adapted for

Table of Contents for the Digital Edition of Licensed Architect - Winter 2015

President’s Letter
Legal Issues The New Construction Industry Arbitration Rules
ADA Advice Accessible Showers: The Devil is in the Details
Conference Recap
ALA New Members
Continuing Education Architectural Coatings: Field Performance and the Application Process
Chapter News
Second Chances: Evaluating Repair Approaches for Historic and Contemporary Window Systems
Insurance Information “Go” “No-Go” Project Evaluation
Firm Management Want To Be More Profitable? Here’s How
Index to Advertisers

Licensed Architect - Winter 2015