MCCCD Program Description

Roof Systems

Course: ABC136

First Term: 2014 Fall

Lecture 1 Credit(s) 1 Period(s) 1 Load
Subject Type: Occupational
Load Formula: S

Description: Defining roof terminology. Identifying and understanding specific roof systems. Using the framing square and essex scale to calculate and measure specific types of rafters. 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

MCCCD Official Course Competencies
1. Identify and define specific roof terms: pitch, span, total rise, rise-per-foot-run and perform calculations used to obtain them. (I) 2. Describe the parts and scales of framing squares and use a framing square to make specific calculations from board-foot measurements, rafter measurements, seat cuts, ridge cuts and tail cuts. (II) 3. Identify and describe the components of hip roofs and gable roofs. (V, VI, VII) 4. Describe the required miter cuts on rafters, how to establish the measuring line, how to transfer from measuring line to top edge and calculate specific lengths of jack rafters.(III) 5. Define unequal roof pitch and calculate rafters for an unequal pitch roof. (IV) 6. Use a speed square to determine rafter lengths. (V) 7. Describe specific types of plank and beam roof systems. (VI) 8. Identify types of trusses used in roof systems and describe proper installation of trusses. (VII, VIII)
MCCCD Official Course Competencies must be coordinated with the content outline so that each major point in the outline serves one or more competencies. MCCCD faculty retains authority in determining the pedagogical approach, methodology, content sequencing, and assessment metrics for student work. Please see individual course syllabi for additional information, including specific course requirements.

MCCCD Official Course Outline
I. Introduction A. Terms and definitions 1. Pitch 2. Span 3. Run 4. Rise-per-foot-run 5. Total rise 6. Hip rafter 7. Jack rafter 8. Other B. Calculations II. 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 III. Rafter Calculations and components 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 IV. Unequal Pitch Roofs A. Calculations and line markings B. Layout of rafters with overhang C. Calculations V. 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 F. Cutting rafters with a speed square 1. Measurements 2. Markings 3. Cuts G. Cutting a hip rafter with a speed square H. Uneven pitch roof I. Cutting valley rafters VI. Plank and Beam Roof Framing A. Component parts 1. Ridge beam 2. T&G 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 VII. 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 VIII. 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 joists (truss joists)

MCCCD Governing Board Approval Date: 2/25/2014

All information published is subject to change without notice. Every effort has been made to ensure the accuracy of information presented, but based on the dynamic nature of the curricular process, course and program information is subject to change in order to reflect the most current information available.