# PDD Practice Exam 2 Case Study - Vegetated Roof

**URL:** <https://community.blackspectacles.com/t/pdd-practice-exam-2-case-study-vegetated-roof/2862>\
**Category:** Project Development & Documentation\
**Created:** [April 6, 2021, 9:51pm UTC](https://community.blackspectacles.com/t/pdd-practice-exam-2-case-study-vegetated-roof/2862 "2021-04-06T21:51:01Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![smoriny](https://blackspectacles.com/uploads/images/14.png) [@smoriny](https://community.blackspectacles.com/u/smoriny)\
**Post date:** [April 6, 2021, 9:51pm UTC](https://community.blackspectacles.com/t/pdd-practice-exam-2-case-study-vegetated-roof/2862/1 "2021-04-06T21:51:01Z")

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Following is the question. The entire facility requires a new flat roof system. The owner has asked the architect to consider a vegetated roofing system. Which of the following items should the architect consider when determining the feasibility of a vegetated roofing system?  
One of the selection but not correct answer is Height of Building. I have not faced any project with vegetated roof in U.S., but when I worked on project outside the U.S., there is a regulation beyond the maximum height limit. I assume same for U.S. and need to know the height of the building to make sure the vegetated roof can be accommodate with in the maximum height limit. I also would like to clarify any requirement for vegetation beyond maximum height limit. If allowed, what is the limit projection of the vegetation/s beyond maximum height and where I can find in code?

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**Author:** ![monicafitzpatrick](https://blackspectacles.com/uploads/images/1.png) [@monicafitzpatrick](https://community.blackspectacles.com/u/monicafitzpatrick)\
**Post date:** [April 8, 2021, 8:27pm UTC](https://community.blackspectacles.com/t/pdd-practice-exam-2-case-study-vegetated-roof/2862/2 "2021-04-08T20:27:49Z")

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Hello! This is a great question. @coachchrishopstock do you mind helping @smoriny

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**Author:** ![coachchrishopstock](https://yyz1.discourse-cdn.com/flex029/user_avatar/community.blackspectacles.com/coachchrishopstock/32/1662_2.png) [@coachchrishopstock](https://community.blackspectacles.com/u/coachchrishopstock)\
**Post date:** [April 8, 2021, 9:48pm UTC](https://community.blackspectacles.com/t/pdd-practice-exam-2-case-study-vegetated-roof/2862/3 "2021-04-08T21:48:50Z")

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Hi @smoriny and thanks for the question!  
Vegetated roof systems are usually relatively low-profile, so the height of the building vs. a maximum allowed height is typically not a factor. Also, most municipalities allow vegetated roof systems to penetrate a maximum building height, so as to encourage their installation on existing buildings that may be built to the maximum allowable height.  
Finally, of the 6 possible choices here, the other 4 options are certainly all considerations, so height of the building is not amongst the 4 best answers to this question.  
I hope this was helpful and good luck in your studies!