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Unit 56

Unit 56. Exterior Window and Door Frames. Window Units • Exterior Door Units • Overhead Garage Doors. Preassembled window and door units are set in place by carpenters.

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Unit 56

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  1. Unit 56 Exterior Window and Door Frames Window Units • Exterior Door Units • Overhead Garage Doors

  2. Preassembled window and door units are set in place by carpenters.

  3. Building codes often specify the minimum glass and venting area required for inhabitable rooms. In this example, the two windows provide 12 sq ft of glass area, which is 10% of the 120 sq ft floor area, and 6 sq ft of natural ventilation, which is 5% of the floor area.

  4. The tops of window and door frames are usually the same height.

  5. Preassembled windows are constructed of a variety of materials including wood, aluminum, and aluminum-clad wood.

  6. Condensation will occur when certain air temperatures and relative humidity is achieved.

  7. National Fenestration Rating Council (NFRC) labels provide information pertinent to window performance.

  8. All windows have one or more sashes that fit into the window frame. A double‑hung unit with two sashes is shown here.

  9. Fixed-sash windows are often used in combination with operable windows. Fixed-sash windows are shown in the middle and at the top of this assembly, and double-hung windows flank the large window at the bottom.

  10. A double‑hung window unit has upper and lower sash sections that move vertically in tracks provided in the window frame. The sashes for some double-hung windows can be tilted inward to allow cleaning of the exterior side.

  11. Double‑hung windows require a balancing device to hold them in an open position.

  12. Casement windows are hinged on one side. The casement window shown here swings outward as the crank operator at the bottom of the window is turned. Sash locks are located along the inner edges of the window.

  13. Sliding windows often feature one movable and one stationary window.

  14. Awning windows are hinged at the top and swing out at the bottom.

  15. Sill pans may be installed at window or door openings to divert water to the outside.

  16. A beveled wood strip or dam strip may be installed below a sill pan to provide a slight angle.

  17. Flexible membrane flashing is commonly used as window and door flashing.

  18. Rough window openings should be flashed with building paper before the window frame is installed.

  19. Windows must be properly sealed to prevent air and moisture infiltration.

  20. Window units are installed in the rough opening, which has been flashed with building paper. Some manufacturers recommend that the sash be removed before installation.

  21. When replacing a wood window unit with a metal unit, the sashes, stops, and parting strips are removed. The metal unit is designed to fit into the existing wood frame in the building.

  22. Skylights are installed in flat or pitched roofs.

  23. Skylights provide additional light and may provide ventilation.

  24. Skylights may be installed over a light shaft in an attic roof. The light shaft is framed between the ceiling joist and roof rafters and is surfaced with gypsum board or wood paneling.

  25. Main entrance doors may be single or double doors. Main entrance doors may be flanked by sidelights or a transom.

  26. Exterior doors provide passage between the inside and outside of a building. Exterior doors may be flush, panel, or crossbuck doors, with or without lights.

  27. Exterior glass sliding doors are frequently used for passage to porches, patios, and terraces.

  28. Door units are installed in the rough opening, which has been flashed with building paper.

  29. Metal doorjambs are anchored to a masonry wall. One end of the anchors is welded to the doorjamb and the other end is embedded between the masonry courses.

  30. When installing wood frames in exterior masonry walls, the frames must be accurately plumbed, leveled, and braced. Masonry walls are then constructed on both sides.

  31. Sliding glass doors may be two- or three-door configurations. The two doors on the right of this sliding glass door unit slide while the door on the left is stationary.

  32. Overhead garage doors are the most common type of garage door.

  33. Sectional roll‑up garage doors are guided by a track system fastened to the jambs and suspended from the ceiling.

  34. Steel overhead rolling doors are used in industrial and commercial buildings.

  35. Automatic opening systems are widely used with residential overhead garage doors. The system shown here has a chain‑and‑cable mechanism operated by an electric motor, which is activated by a pushbutton in the garage or a transmitter carried in an automobile.

  36. Rough openings for overhead garage doors must accommodate space needed for the garage door in the open position.

  37. Various hardware components are used for an overhead garage door.

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