The estimated completion time is forty-five minutes.
Objectives
At the end of this study session, you should be able to:
At the end of this study session, you should be able to:
- Describe the details of installation of a modified bitumen single-ply membrane.
- Explain the techniques for differentiating modified bitumen roofing from roll roofing.
- Describe and be able to recognize the possible conditions that you could encounter in the field.
Question 1
For a modified bitumen single ply membrane without a granular surface, what are some clues that can help you to differentiate the surface from other membranes?Selected Answer: 1. It is not plastic or elastomericCorrect Answer: Modified bitumen seams are approximately three feet apart. Seams on other single ply membranes are further apart. There may be bleed out of asphalt at the seams of the modified bitumen roof. Modified bitumen roofing is much thicker than most plastic and synthetic rubber roofing.Response Feedback: [None Given] Question 2
Give one example of ultraviolet protection that is typically used on modified bitumen single ply roofing:Selected Answer: 1. A granular surface2. Liquid applied latex coating3. Foil surfaces (Aluminum or copper)4. BallastedCorrect Answer: - Granular surfacing - Liquid applied latex coatings - Foil surfacesResponse Feedback: [None Given] Question 3
If you are looking at a single ply roof surface that has a granular surface, what are some clues that will help you to differentiate modified bitumen from roll roofing?Selected Answer: 1. Mod bit roofing is 39 inches and roll roofing is 36 inches2. Mod bit is more flexible3. Roll roofing has nail heads that are exposed.Correct Answer: Roll roofing often has nail heads that are exposed or covered with plastic cement and/or plastic cement along the seams. Roll roofing is typically not used for flashings. Modified bitumen is more flexible than roll roofing and will usually not break if folded. Roll roofing is usually 36 inches wide. Modified bitumen roofing is usually 39 inches (1 meter) wide.Response Feedback: [None Given] Question 4
List 6 common installation mistakes on modified bitumen roofing.Selected Answer: 1. Inadequate overlaps at sides or ends2. Seams facing up the slope3. Poor surface preparation4. Ponding due to lack of slope5. End seams not staggeredCorrect Answer: - Seams facing up the slope - Inadequate overlap of seams - End seams not staggered - Inadequate fastening of the membrane to the decking - Poor sealing at seams and flashings - Inadequate drainageResponse Feedback: [None Given] Question 5
List 9 common problems you'll find on modified bitumen roofs. Don't count installation problems.Selected Answer: 1. Old/worn out2. Openings at seams and flashings3. Surface cracking4. Loss of granulars5. Slippage of the membrane6. Blisters7. Punctures or tears8. Ponding/vegetation9. PatchedCorrect Answer: - Old - Openings at seams and flashings - Surface cracking - Loss of granules - Slippage - Blisters - Punctures - Ponding - Patching (temporary repairs)Response Feedback: [None Given] Question 6
A roll roofing single-ply membrane is essentially the same as a modified bitumen membrane with a granular surface. The typical life cycle is essentially the same.Selected Answer: False
Answers: TrueFalse
Response Feedback: Good work
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