Search Results for J jack truss A roof truss which is smaller than the main trusses, such as a truss in the end slopes of a hip roof. jalousie A window shutter or blind having stationary or adjustable slats angled so as to permit ventilation and provide shade and even some privacy, while simultaneously preventing the entrance of rain. jamb An exposed upright member of each side of a window frame, doorframe, or door lining. In a window, these jambs outside the frame are called reveals. jerrybuilt Constructed in a shoddy or flimsy manner. jesting beam Any beam employed strictly for decorative or ornamental, as opposed to structural, purposes. jetty Any portion of a building that protrudes beyond the part immediately below it, such as a bay window or the second story of a garrison house. joint The space, however small, where two surfaces meet. joint reinforcement Any steel reinforcement used in or on mortar joints, such as reinforcing bars or steel wire. jointing compound In drywall, premixed finishing material applied over joints and voids to be sanded to a smooth finish. joist A piece of lumber two or four inches thick and six or more inches wide, used horizontally as a support for a ceiling or floor. Also, such a support made from steel, aluminum or other material. joist hanger A metal angle or strap used to support and fix the ends of wood joists or rafters to beams or girders. This type of anchor acts in shear and in tension. journeyman The second or intermediate level of development of proficiency in a particular trade or skill. jumbo brick A brick manufactured larger than standard size, measuring 8" x 4" x 4", including mortar joints. junction box A metal box in which splices in conductors or joints in runs of raceways or cable are protectively enclosed, and which is equipped with an easy access cover. Search Again