Transcription of Chapter 2: TRUSS AND ROOF TERMINOLOGY - ITC-SA
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Chapter 2: TRUSS AND ROOF TERMINOLOGY - ITC-SA
_____ Estimator/Designer Course Level 1 Revised Edition: January 2017 Chapter 2: TRUSS AND roof TERMINOLOGY APEX: The highest point on a TRUSS where the sloping top chords meet (Figures 3, 4 & 6). AXIAL FORCE: A push (compression) or pull (tension) acting along the length of a member. Usually measured in Newtons (N) or kiloNewtons (kN). (Figure 18) AXIAL STRESS: The axial force acting at a point along the length of a member, divided by the cross-sectional area of the member. Usually measured in MegaPascals (MPa) or Newtons per square millimeter (N/mm2). (Figure 18) BARGE BOARDS: Trim boards applied to gable ends of buildings. (Figure 2 & 10) BATTENS: Small-section timber members usually 36x36 (See SANS 1783-4) spanning between trusses, connected to the top of the top chord of the TRUSS and usually supporting a roof covering of tiles or slates (Figure 4).
GIRDER TRUSS: A truss that supports other trusses, beams or rafters (Figures 1 & 2). GUTTER: A sheet metal or PVC profile attached at the end of the overhang of the roof trusses to catch rain water runoff from the roof (Figure 3) HEEL: The part of a truss where the top chord and bottom chord intersect (Figures 3 - 6).
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