ASSIGNMENT  3 Textbook  Assignment: Chapter 3 -   Roof  Construction  and  Trim  Carpentry Chapter 4   - Exterior Finish of Walls 3-1. Roof sheathing has what primary purpose? 1. Appearance 2. Nailing base for shingles 3. Insulation 4. Tying  rafters  together 3–2 . Composition  roof  sheathing  should be laid in which of the following ways? 1. Closed 2. Open,  horizontally  only 3. Open,  diagonally  only 4. Open,  horizontally  or diagonally 3-3. Board  roof  sheathing  normally  falls into which of the following categories? 1. Matched  tongue  and  groove  only 2. Shiplapped  only 3. Shiplapped  and  square  edged only 4. Any of the above 3–4. Tongue-and-groove  boards  used  for closed  sheathing  must  be  supported by what minimum number of rafters? 1. One 2. Two 3. Three 4. Four 3–5. When you are determining the plywood  thickness  for  roof sheathing,  which  of  the  following factors should NOT be a consideration? 1. Rafter  spacing 2. Weather  conditions 3. Insulating  factor 4. Type of roofing material to be used 3-6. In what direction relative to the rafters should the face grain of plywood  sheathing  run? 1. Perpendicular 2. Parallel 3. Diagonal 3-7. When  nailing  3/4-inch  plywood sheathing to the rafters, what size nails should you use? 1. 10d 2. 8d 3. 6d 4. 4d 3-8. What is the purpose of the 2° bevel cut on the ends of plank roof decking? 1. To allow for expansion 2. To ensure a tight face joint 3. To  ensure  space  for  adjustment 2. To allow for quicker installation 3-9. What length should nails should you use  for  fastening  plank  decking? 1. Twice the nominal plank thickness 2. Three times the nominal plank thickness 3. Three and one–half times the nominal  plank  thickness 4. Four times the nominal plank thickness 3–l0. Roof decking extending beyond a gable-end wall should span at least how many rafters? 1. One 2. Two 3. Three 4. Four 12