Maricopa Community Colleges  SUN204   20052-20086 
Official Course Description: MCCCD Approval: 07/22/08
SUN204 20052-20086 LEC 2 Credit(s) 2 Period(s)
Construction of Roof Systems
Identifying and understanding specific roof systems. Using the framing square and essex scale to calculate and measure specific types of rafters. Defining roof terminology. Transcribing and transferring measurements onto rafters. Using "speed square" to determine measurements for specific types of rafters. Defining unequal roof pitch. Identifying specific types of plank and beam roofs and roof trusses used in the industry today.
Prerequisites: Registered apprentice status or permission of the apprenticeship coordinator.
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MCCCD Official Course Competencies:
 
SUN204   20052-20086 Construction of Roof Systems
1. Identify and define specific roof terms: pitch, span, total rise and rise-per-foot-run. (I)
2. Given specific roof dimensions, calculate pitch, total rise and rise-per-foot-run. (II)
3. Describe the parts and scales of a rafter framing square. (III)
4. Make specific calculations, using a rafter framing square, for board foot measurements, rafter measurements, seat cuts, ridge cuts and tail cuts. (III, IV)
5. Describe the required miter cuts for rafters. (IV)
6. Explain how to establish the measuring line on a rafter and transfer to the top edge of the rafter. (IV)
7. Calculate specific lengths of jack rafters. (IV)
8. Define "unequal roof pitch" and calculate rafters for an unequal pitch roof. (V)
9. Describe the process for erecting a roof. (VI)
10. Use a "speed square" to cut rafter lengths. (VII)
11. Describe specific plank and beam roof systems. (VIII)
12. Identify types of trusses used in roof systems. (IX)
13. Describe the proper installation of trusses. (X)
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MCCCD Official Course Outline:
 
SUN204   20052-20086 Construction of Roof Systems
    I. Terms and definitions
        A. Pitch
        B. Span
        C. Run
        D. Total rise
        E. Rise-per-foot-run
        F. Rafters
          1. Common
          2. Hip
          3. Jack
          4. Cripple jack
          5. Hip jack
          6. Valley
          7. Valley jack
        G. Valley board
        H. Ridge board
      II. Roof calculations
          A. Roof as geometric design
            1. Right angle triangles
            2. Base
            3. Altitude
            4. Hypotenuse
          B. Formulas
        III. Rafter framing square
            A. Components
              1. Body
              2. Tongue
              3. Heel
              4. Face
              5. Back
              6. Scales
            B. Essex board measure
              1. Board feet
              2. Starting point
              3. Board feet calculations
              4. Board feet assumptions
          IV. Rafter calculations
              A. Length of common rafter per foot run
              B. Odd span or odd run common rafter
              C. Length of hip or valley rafter per foot run
                1. Ridge cut/plumb cut
                2. Seat cut/birds mouth
              D. Measuring line
                1. Establishing the line
                2. Transferring the line
              E. Cutting a hip rafter
              F. Odd span/odd run hip rafter
                1. Cheek side cuts
                2. Backing the hip rafter
              G. Valley rafters
              H. Jack rafters
                1. Hip jack rafter
                2. Valley jack rafter
                3. Theoretical length vs. actual length
              I. Valley jack rafters
            V. Unequal pitch roofs
                A. Calculations and line markings
                B. Layout of rafters with overhang
              VI. Erecting a roof
                  A. Weight transference
                  B. Marking the top plate and ridge beam
                  C. Plumbing the rafters
                  D. Bracing
                    1. Collar ties
                    2. Purlins
                  E. Flat deck roof
                VII. Rafter cutting with a speed square
                    A. Cutting common rafters
                      1. Measurements
                      2. Tables
                      3. Markings
                      4. Cuts
                    B. Cutting a hip rafter
                    C. Uneven pitch roof
                      1. Methods of calculating rise per foot run
                      2. Procedure for obtaining measurements
                    D. Cutting valley rafters
                      1. Measurements
                      2. Markings
                      3. Cuts
                  VIII. Plank and beam roof framing
                      A. Component parts
                        1. Ridge beam
                        2. Tongue and groove planks
                        3. Rafter beam
                        4. Bearing block
                        5. Beam hanger
                        6. Framing hangers
                      B. Longitudinal method
                      C. Flat roof steel frame
                      D. Precast concrete roof
                      E. Metal roof with concrete roof deck
                      F. Heavy timber construction
                      G. Laminated beams
                    IX. Trusses and roof designs
                        A. Truss types
                          1. Three hinged arch
                          2. Mansard
                          3. Scissors
                          4. Cambered
                          5. Double pitch
                          6. Flat howe
                          7. Flat warren
                          8. Pitched flat
                          9. System 42
                          10. Modified warren-system 42
                          11. Vault
                          12. Gable end
                          13. Umbrella
                        B. Specifications and design criteria
                          1. National design specification for wood construction
                          2. National design specification for metal plate connected wood trusses
                        C. Lumber grades
                        D. Roof structures and configurations
                        E. Valleys
                      X. Installation of roof trusses
                          A. Inspection and repairs
                          B. Selection and spacing
                          C. Bracing
                          D. Gable ends and gable end overhang panels
                          E. Space joist system
                          F. Flat roof design - solid roof rafter
                          G. Flat roof space joints (truss joists)
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