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IBC 1007.1.1 Two exit measurements

J

John DeBruyne

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Dec 14, 2020
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13
Location
Detroit, MI
2 part question. This is a generic scenario in the attached sketch. No need to overthink.
1. A meeting room requires 2 exits. It has an adjacent small closet (or office or toilet or whatever) that on its own would require 1 exit access. What is the correct way to measure the 1007.1.1 diagonal: red dashed line or blue dashed line?
2. What is the correct way to measure the distance between exits to comply with 1007.1.1.1.1: Thin green line representing the closest opening edges, thin red line representing the center of the door, thin black line representing the furthest opening edges, or literally "any" point along the width of openings I chose?
 

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  • Exit Separation.JPG
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Blue line and any of the lines for the distance between exits. Here's what the 2021 IBC has to say about it:

1007.1.1.1 Measurement point - The separation distance required in 1007.1.1 shall be measured in accordance with the following:
1. The separation distance to exit or exit access doorways shall be measured to any point along the width of the doorway.
2. The separation distance to exit access stairways shall be measured to the closet riser.
3. The separation distance to exit access ramps shall be measured to the start of the ramp run.
 
NCRooster said:
Blue line and any of the lines for the distance between exits. Here's what the 2021 IBC has to say about it:

1007.1.1.1 Measurement point - The separation distance required in 1007.1.1 shall be measured in accordance with the following:
1. The separation distance to exit or exit access doorways shall be measured to any point along the width of the doorway.
2. The separation distance to exit access stairways shall be measured to the closet riser.
3. The separation distance to exit access ramps shall be measured to the start of the ramp run.
Click to expand...
So it is any point, so it is the closest (because why wouldn't you) so it is green....
 
RLGA said:
It could be green, it could be red, it could be black, or it could be anywhere in between the green and black.
Click to expand...
Yeah...i was thinking backwards....You would want that to be the bigger # for more separation....So if you are trying to do minimum it would be red (more separation = longer diagonal)...
 
The question is specifically for the IBC, but for those of us who also have to follow NFPA (such as FL); the answer is the dashed blue line and the thin green line.


7.5.1.3.2*
Where two exits, exit accesses, or exit discharges are required, they shall be located at a distance from one another not less than one-half the length of the maximum overall diagonal dimension of the building or area to be served, measured in a straight line between the nearest edge of the exits, exit accesses, or exit discharges, unless otherwise provided in 7.5.1.3.3 through 7.5.1.3.5.
 
For the diagonal measurement under IBC 1007.1.1, you'll want to go with the red dashed line. This approach accounts for the overall distance in the most effective way.
 
The red dashed line doesn't account for the overall distance. The same exits serve the closet, so the closet has to be included in the analysis. The blue line represents the maximum diagonal of the area served.
 
For the diagonal measurement under IBC 1007.1.1, you'll want to go with the red dashed line. This approach accounts for the overall distance in the most effective way. The blue dashed line looks tempting, but it doesn't fully capture the requirement for measuring the maximum diagonal of the space.

Also, if you ever need precise measurements for these sorts of evaluations, especially on-site, an on-screen ruler can come in handy for quick, accurate measurements without the need for additional tools.
 
erstonparo1973 said:
Also, if you ever need precise measurements for these sorts of evaluations, especially on-site, an on-screen ruler can come in handy for quick, accurate measurements without the need for additional tools.
Click to expand...

Adobe Reader, Adobe Acrobat, Foxit, and Bluebeam all have a measuring tool built in -- but the underlying drawing has to be drawn to scale, and you have to know what the scale is.
 
erstonparo1973 said:
For the diagonal measurement under IBC 1007.1.1, you'll want to go with the red dashed line. This approach accounts for the overall distance in the most effective way. The blue dashed line looks tempting, but it doesn't fully capture the requirement for measuring the maximum diagonal of the space.

Also, if you ever need precise measurements for these sorts of evaluations, especially on-site, an on-screen ruler can come in handy for quick, accurate measurements without the need for additional tools.
Click to expand...

The code requirement isn't "the arewa of the space" -- it's the "area served." You can't ignore the closet.
 
Yankee Chronicler said:
Adobe Reader, Adobe Acrobat, Foxit, and Bluebeam all have a measuring tool built in -- but the underlying drawing has to be drawn to scale, and you have to know what the scale is.
Click to expand...
with Blue Beam you don't need to know the scale. There is a calibrate option where you pick two points with a known dimension and the software will determine the scale for you.
 
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