CE Practice Exam #52, why door thickness is added to calculate door width?

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Hao Li

July 24, 2023 14:52

In this question, how do I understand the "2" door thickness, why it is added to calculate door width" in step 4 from the official answer?

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  Russ Montenero July 30, 2023 01:15 (Edited July 30, 2023 01:38)

  The thickness of the door and the thickness of the panic hardware mounted to the door are going to impede the path of egress. Looking at the door while open at 90 deg, you’ll see how the thicknesses of these two items makes sense. 

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  Hao Li July 31, 2023 14:18

  Okay, I got it now, and that kind of interpretation about clear width is wicked. Even I follow that interpretation, the door leaf width should be 1"(Door Stop) + 35" + 2"(Door Thickness) + 2"(Panic Bar) = 40". Unless, you say Panic Bar could be push in so it wouldn't be counted in.

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  Blane Hammerlund August 01, 2023 13:37

  IBC Section 1010.1.1, Size of Doors.

  "The required capacity of each door opening shall be sufficient for the occupant load thereof and shall provide a minimum clear opening width of 32 inches. The clear opening width of doorways with swinging doors shall be measured between the face of the door and the stop, with the door open 90 degrees." 

  So this leads me to believe that the NCARB answer is correct and that the panic hardware is not accounted for. 

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  Hao Li August 01, 2023 13:47

  got it, thank you both!

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  Haytham Abdelrahman Abdelall August 01, 2023 14:21 (Edited August 01, 2023 14:25)

  Reference to the above IBC Sec # 1010.1.1 if the panic hardware is not accounted for, it means that the min leaf width = Clear Door Width (35") + 1" (Door Stop) on left side + 2" Door thickness on right side = 38"

  Not sure why we count door thickness to figure out the leaf width ? It should be cleat door width + 2 * Door stops.

   

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  Russ Montenero August 04, 2023 02:53

  So in effect the 38” door allows for a 2” thick panic bar/crash bar. I was probably making too many assumptions in my comments above - not to mention by using my 2” number for the panic bar the math wont work, but Haytham and Blane’s way of thinking is much more concise. Thanks for your comments everyone.

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  Mason Orantes July 11, 2024 15:04

  This question also took me hours to understand.  Pushbar is not accounted for in clear width.  I believe this diagram is fully explanatory. :)

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