Courtesy of Marlene terreros-Oronao, Arlington County Historic Preservation Program
David Gibney, left, leads a window restoration workshop in Arlington. Mr. Gibney, a member of the Window Preservation Standards Collaborative and owner of Historic Restoration Specialists, says most window problems can be solved with rope caulk and weatherstripping.

Courtesy of Marlene terreros-Oronao, Arlington County Historic Preservation Program David Gibney, left, leads a window restoration workshop in Arlington. Mr. Gibney, a member of the Window Preservation Standards Collaborative and owner of Historic Restoration Specialists, says most window problems can be solved with rope caulk and weatherstripping.