Roofing Inspection Section#3 Flat Roofing Quiz#2

You should have finished Study Session 1 before starting this study session. This study session covers built-up roofing including construction and installation. Typical conditions that you may encounter in the field are discussed in detail.

The estimated completion time is sixty minutes.

Objectives
At the end of this study session, you should be able to:

• Describe the details of installation of a built-up roof.
• Describe and be able to recognize the possible conditions that you could encounter in the field.

• Question 1

  Needs Grading

  	Give two implications of a ponding roof:
  	Selected Answer: 1. The prolonged exposure to water is likely to shorten the life of the membrance. 2. The weight of the ponded water deflects the structure and makes the poor slope worse. The more water that accumulates, the more the structure sags. The more the structure sags, the larger the low spot and the more water that can accumulate. 3. When a ponding roof leaks, there is often a large volume of water involved. The can cause significant damage inside the building.  Correct Answer:   - A shortened life expectancy - Roof structure sag - A large volume of water available to leak into the building - Vegetation growth on the roof Response Feedback: [None Given]

• Question 2

  Needs Grading

  	If it has not rained in a long time, and there is no ponding at the time of the inspection, what are other clues that might lead you to believe that the roof has experienced some ponding?
  	Selected Answer: 1. Circles that are paticularly dirty on the roof. 2. Show algae. 3. Vegetation growth.  Correct Answer:   Look for dirt, algae and vegetation on the roof surface. Response Feedback: [None Given]

• Question 3

  Needs Grading

  	We have discussed 13 conditions relating to the membrane of a built up roof. List as many as you can.
  	Selected Answer: 1. Old/Worn out 2. Mechanically damaged 3. Patched. 4. Multiple layers 5. No protective surface (gravel or paint) 6. Blisters 7. Alligatoring 8. Gravel erosion 9. Ridging and fishmouths 10. Membrane movement/splitting 11. Ponding/vegetation 12. Debris or storage on the roof 13. Exposed felts Correct Answer: - Old - Mechanically damaged - Patched (temporary repairs) - Multiple layers - No protective surface - Blisters - Alligatoring - Gravel erosion - Ridging - Fish-mouths - Membrane movements - Ponding - Debris or storage - Exposed felts Response Feedback: [None Given]

• Question 4

  Needs Grading

  	We have listed 16 examples of poor installation practice. Give as many as you can.
  	Selected Answer: 1. Mopping roofing felts directly onto a wood or playwood deck 2. Failure to properly secure dry-laid felts to the deck. 3. Using incompatible materials Correct Answer: - Mopping roofing felts directly to the deck - Failure to properly secure dry laid felts - Using incompatible materials - Using the wrong type of asphalt - Applying only one or two plys - Improper asphalt temperature - Using too much or too little asphalt - Failure to completely bond the felts - Failure to press the felts into the asphalt - Working with wet felts, gravel or decking - Failure to install UV protection - Using sharp gravel - Failure to provide proper drainage - Failure to complete roofing operations at one time - Installing the membrane on a steep slope - Applying a membrane into a roof that flexes too much Response Feedback: [None Given]

• Question 5

  Needs Grading

  	What causes blisters in a built up roof surface? (3 things)
  	Selected Answer: 1. Air or water trapped between the roof sheathing and the membrane. 2. Air or water trapped between the plies of the membrane. 3. Air or other gas trapped in the asphalt. Correct Answer: - Air or water trapped beneath the sheathing or the membrane - Air or water trapped between the plys of the membrane - Air or other gases trapped in the asphalt Response Feedback: [None Given]

• Question 6

  Needs Grading

  	What is the main implication of exposed felts?
  	Selected Answer: water will be wicked into the roof, leading to premature failure and leakage. Correct Answer:   Water may be wicked into the felts. Response Feedback: [None Given]

• Question 7

  Needs Grading

  	What is the purpose of the asphalt, and the felts, in a built up roof?
  	Selected Answer: 1. Asphalt is waterproofing material 2. The felts hold the asphalt in place and provide strength, distribute the forces and stabilize the layers of asphalt. Correct Answer: The asphalt is the waterproofing material. The felts hold the asphalt in place, add strength, distribute the forces and stabilize the layers of asphalt. Response Feedback: [None Given]

• Question 8

  Needs Grading

  	What is the purpose of the flood coat on a tar and gravel roof?
  	Selected Answer: To protect felts below Correct Answer:   The flood coat holds the gravel in place and provides some waterproofing. Response Feedback: [None Given]

• Question 9

  Needs Grading

  	What is the purpose of the gravel on a tar and gravel roof?
  	Selected Answer: The gravel provided ballast to help hold the roof membrane down.  The gravel also provided some fire protection for the roof.  The gravel provided some protection against foot traffic. Correct Answer:   The gravel provides ultraviolet protection for the roof. Response Feedback: [None Given]

• Question 10

  0 out of 0 points

  	Any roof that still has water on it _____ hours after a rain is defined as a "ponding" roof.
  	Selected Answer:  48 Correct Answer: Evaluation Method Correct Answer Case Sensitivity Exact Match 48 Exact Match forty eight Exact Match forty-eight

• Question 11

  0 out of 0 points

  	Does a tar and gravel roof that is completely covered with a wood deck, require gravel?
  	Selected Answer:   No Answers: Yes   No Response Feedback: Good work

• Question 12

  0 out of 0 points

  	Is it good practice to apply new built-up roof membranes over old?
  	Selected Answer:   No Answers: Yes   No Response Feedback: Good work