How many entrances to the building should be accessible?
I have a question about accessible entrances to the building. What is the minimum amount of accessible entrances to the building?
IBC 1104.2 saying "At least one accessible route shall connect accessible buildings, accessible facilities, accessible elements and accessible spaces that are on the same site".
IBC 1105.1 saying "... at least 60 percent of all public entrances shall be accessible"
While ADA 206.4.1 states "...at least 60 percent of all public entrances shall comply with 404"
In conflicting code statements I would go with the most stringent one. But I answered "More than half" in Black Spectacle and they are saying that one entrance is a minimum. I clearly remembered from ADA that it should be 60%.
So which should I answer at ARE exam?
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It is correct that the minimum is one entrance. Because 2/3 or 60% of 1 is 1. 2/3 of 2 entrances is 1. Now 2/3 of 3 total entrances is.....wait for it....2. And so forth. Do note that it is the public entrances and those that are required to be accessible would also have to be a part of the accessible route.
You are also correct with the most stringent applies. Yet, the ADA is NOT code. It a civil law which is enforce by lawsuits, or precisely a court ruling. Hence, a lift must be installed in a pool for public use. I've done enough hotel design to know this.
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Kirill,
60% of 4 is 2.4. You must always round up while calculating for elements of minimum quantity measured in integers, therefore, the answer is 3.
Derek is incorrect in his calculation that 2/3 of 2 entrances is one. 60% of 2 entrances is 1.2 which would round up to 2.
1 ... 60% = 0.6 ... 1
2 ... 60% = 1.2 ... 2
3 ... 60% = 1.8 ... 2
4 ... 60% = 2.4 ... 3
5 ... 60% = 3.0 ... 3
...and so on.
Notice how each entrance the count rises 0.6, so perhaps that an easier value to remember than thinking in terms of percentages instead of quantity. It helps me at least...
Good luck on the exam!
Kevin Griendling, AIA
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Derek,
You are correct that they will give you all of the information you need to know, but this is a methodology. One needs to learn and remember that minimum quantity measured in integers will always round up.
All the best!
Kevin Griendling, AIA
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