GLOSSARY OF WINDOW TERMS The Learning Center Head The main horizontal member forming the top of the window or door frame. Head Board A flat board cut to fit the contour of a bow or bay window and installed between the head jambs and the flat wall surface to finish off that area which would normally be ceiling. Header A heavy beam extended across the top of the rough opening to prevent the weight of wall or roof from resting on the window frame. Hopper A window with a top sash that swings inward. Infiltration The inadvertent flow of air into a building through breaks in the exterior surfaces of the building (e.g., through joints and cracks around window and skylight frames, sashes and glazings). Head - Keeper Insulation When old windows are removed and new ones installed generally there will be areas that will have voids that will need to be insulated. This is especially true if the windows were of the outdated variety that had counter weights in the walls. That cavity should be insulated. Jack Stud Framing members, generally 2" x 4"s, which form the inside of the window or door rough opening. They run from the sole plate to the header, which is supported by them. Jamb Liner Metal or plastic covering the inside surface and head jambs of sliding windows. Keeper The protruding, hook-shaped part of a window lock, which is mounted on the inside surface of the sash stile. < previous main menu       next > 1-877-SWING CLEAN info@energyswingwindows.com 3245 Miracle Drive Murrysville, PA 15668 724-387-2991 PA Contractor ID PA001856