Roof System

• Rafters


  Light-gauge steel joist sections serve as?
• Hip


  Roofs that have sloping ends and sides meeting at an inclined projecting angle
• Ridge beam


  Is a structural horizontal member supporting the upper ends of rafters at the ridge of a roof
• Valley


  Is intersection of two inclined roof surfaces toward which rainwater flows
• Hip


  Is the inclined projecting angle formed by the junction of two adjacent sloping sides of a roof
• Rake


  Is the inclined, usually projecting edge of a sloping roof
• Pratt

  Trusses that have vertical web members in compression and diagonal web members in tension
• Howe

  Trusses that have vertical web members in tension and diagonal web members in compression
• Fink


  Are Belgian trusses having sub-diagonals to reduce the length of compression web members toward the centerline of the span
• Low-slope


  A sloping roof up to 3:12
• Collar tie


  Unite two opposing rafters at a point below the ridge, usually in the upper third of the rafter length
• Main rafter


  Extend from a wall plate to a ridge board or ridge beam and support the sheathing and covering of a roof
• Habitable attic space


  Sufficient headroom, ventilation, and natural light
• Flat roof


  Which of the following require a continuous membrane roofing material, can efficiently cover a building of any horizontal dimension, and may be structured and designed to serve as an outdoor space?
• Flat

  Trusses that have parallel top and bottom chords
• Dormer


  Are projecting structures built out from a sloping roof and housing a vertical window or ventilation louver
• Roof construction


  Should also control the passage of moisture vapor, the infiltration of air, and the flow of heat and solar radiation
• Roof form and slope


  Must be compatible with the type of roofing used to shed rainwater and melting snow to a system of drains, gutters, and downspouts
• Gambrel roof


  Are divided on each side into a shallower slope above a steeper one
• Warren

  Trusses that have inclined web members forming a series of equilateral triangles
• Space frame


  A long-spanning three-dimensional plate structure based on the rigidity of the triangle and composed of linear elements subject only to axial tension or compression
• Soffit


  The underside of an overhanging roof eave
• Ridge board


  Is a nonstructural horizontal member to which the upper ends of the rafters are aligned and fastened
• Knee

  Are short walls supporting rafters at some intermediate position along their length
• Steel truss


  Are generally fabricated by welding or bolting structural angles and tees together to form the triangulated framework
• Hip jack


  Are jack rafters extending from a wall plate to a hip rafter
• Crescent

  Trusses that have both top and bottom chords curving upward from a common point at each side
• Ridge


  The horizontal line of intersection at the top between two sloping planes of a roof
• Gable roof


  They slope downward in two parts from a central ridge, so as to form a gable at each end
• Roof


  Primary sheltering element for the interior spaces of a building
• Shed

  A roof having a single slope
• Tetrahedron


  The simplest spatial unit of a space frame having four joints and six structural members
• Bowstring


  Trusses that have a curved top chord meeting a straight bottom chord at each end
• Rigid frame


  Consist of two column and a beam or girder that are rigidly connected at their joints