Roof drainage

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    Scott Barber

    Hi Brenda, you can find this info in the IPC (Chapter 11). I'm not sure if there's a book that discusses it as well, but that has all the charts based on location, roof slope, catchment area, etc.

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    Brenda Margolis

    So should I be adding the IPC to my list of resources that I am studying for the exam? I had more than one rather specific question regarding this topic on the exam and had only come across it much more generally in the main ncarb listed references. (I dont think the IPC is listed as a study resource?)

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    Scott Barber

    I don't see the IPC listed in the ARE Handbook either...

    I'm not sure what question you saw (not asking for any details) but section 1502 in the IBC does have a small amount of info for roof drainage, which might have covered the content of your question. It does reference two sections of the IPC in that section as well. Along those lines, I'm not sure how to suggest people study the IBC as referenced in the ARE Handbook. Since there are two sections of the IPC that the IBC references, would you be responsible for that as well? Maybe NCARB didn't include the IPC because most of that code isn't covered, even if a few sections could be? Just my brief speculation.

    I did just look through Architectural Graphics Standards and found it covered in there in the section with gutter and downspout shapes and sizes. AGS has so much good information it can be hard to study, but it's definitely in the top three books on my list for PPD and PDD. 

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    David Kaplan

    Brenda,

    I might also offer to you that if you get a question on the exam that says (and i'm just completely making this up) "how many roof drains are required for a roof area X big in SF, I would wager a strong bet that you will be given some sort of table (perhaps from IBC or IPC) that identifies for you how many SF can be allocated per drain based on roof slope and/or roof materials.  You'd then have to use that table and info given to you on the question about the roof to figure it out.  I'd be very surprised if you had to have something memorized to address a question like this.  Just my take.

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    Gang Chen

    David is right. Even in real practice, you do not need to memorize these numbers, you just need to know where to find the information and how to size the drain with the data.

    Gang Chen, Author, AIA, LEED AP BD+C (GreenExamEducation.com)

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