Roofing Inspection Section#3 Flat Roofing Quiz#5

You should have finished Study Session 4 before starting this study session. This study session covers flat roof flashing. These flashings may be common for all of the flat roofing membrane systems described up to this point. As mentioned several times previously, the flashings are the critical areas where a leak could develop and much of your time inspecting roofs should be devoted to the flashings.

The estimated completion time is ninety minutes.

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

• Describe the different types of flashings that are typically in use on the various types of flat roofs.
• Identify different flat roof flashing types.

• Question 1

  Needs Grading

  	A common way to install counter flashing at a flat roof / wall joint is to attach the flashing to the wall with mechanical fasteners and then seal the top joint with a flexible sealant. What are the drawbacks to such an installation?
  	Selected Answer: It requries high maintainace Correct Answer: These joints remain watertight for only a short period and the mechanical fasteners are potential leakage points. This is a high maintenance detail. Response Feedback: [None Given]

• Question 2

  Needs Grading

  	For a flashing detail where a flat roof meets a wall, the top edge of the base flashing is not a water tight joint. What keeps water from getting in behind the base flashing?
  	Selected Answer: The counter flashing Correct Answer:   The counterflashing Response Feedback: [None Given]

• Question 3

  Needs Grading

  	Individual pieces of metal flashing should be no longer than _________.
  	Selected Answer: 10 feet Correct Answer:   10 feet Response Feedback: [None Given]

• Question 4

  Needs Grading

  	List seven general principles that apply to all good flashing.
  	Selected Answer: 1. Allow the roof menbrane to be secured in place 2. Make water-tight joints between the roof membrane and other materials Correct Answer: Good flashings should: - Allow the roof membrane to be secured in place - Make watertight joints between the roof membrane and other materials - Protect the joints from the weather, mechanical damage, heat and ultraviolet light - Allow for expansion and contraction due to changes in temperature and moisture - Last as long as the roof membrane - Be executed consistently with reasonable skill levels - Be cost effective Response Feedback: [None Given]

• Question 5

  Needs Grading

  	On steep roofs, the most common area for leakage to occur is at the flashings. Where is the most common area for leakage on a flat roof?
  	Selected Answer: The flashing Correct Answer:   At the flashings Response Feedback: [None Given]

• Question 6

  Needs Grading

  	What is a cant strip and where is it used?
  	Selected Answer: Cant strips are triangular blocks used at 90 degress intersections to allow asphalt based roofing materials to make two 45 degree bends.  Correct Answer:   Cant strips are triangular blocks used at 90 degree intersections to allow asphalt based roofing materials to make two 45 degree bends. Response Feedback: [None Given]

• Question 7

  Needs Grading

  	What is the purpose of a "pitch pocket"?
  	Selected Answer: A pitch pocket is used to flash irregularly shaped roof penetrations Correct Answer:   A pitch pocket is used to flash irregularly shaped roof penetrations. Response Feedback: [None Given]

• Question 8

  Needs Grading

  	What is the purpose of a secondary scupper?
  	Selected Answer: To act as emergency drains in case the primary drains are obstructed Correct Answer:   Secondary scuppers act as emergency drains in case the primary drains are obstructed. Response Feedback: [None Given]

• Question 9

  Needs Grading

  	When a skylight is installed on a flat roof an 8 inch high curb is built for the skylight frame to sit on. Does the skylight frame go over the base flashing or does the base flashing extend up the sides of the skylight frame?
  	Selected Answer: The skylight frame goes over the base flashing.  Correct Answer:   The skylight frame goes over the base flashing. Response Feedback: [None Given]

• Question 10

  Needs Grading

  	Why would you not want aluminum flashing on masonry?
  	Selected Answer: Not compatible Correct Answer:   Aluminum is not compatible with masonry Response Feedback: [None Given]

• Question 11

  0 out of 0 points

  	When a steep roof drains onto a flat roof, the flat roof membrane should extend about ____ feet up under the steep roofing shingles or tiles.
  	Selected Answer:  3 Correct Answer: Evaluation Method Correct Answer Case Sensitivity Exact Match 3 Exact Match three

• Question 12

  0 out of 0 points

  	On a flat roof flashing system, the counter flashing is typically attached to the:
  	Selected Answer:   Vertical surface Answers:   Vertical surface Horizontal surface Response Feedback: Good work

• Question 13

  0 out of 0 points

  	True or false, the base flashing on a flat roof is a "shedding system"
  	Selected Answer:  False Answers: True  False Response Feedback: Good work